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The FABACEAE, LEGUMINOSAE or PAPILIONACEAE, commonly known as the LEGUME, PEA, or BEAN FAMILY, are a large and economically important family of flowering plants . It includes trees , shrubs , and perennial or annual herbaceous plants , which are easily recognized by their fruit (legume ) and their compound, stipulated leaves. Many legumes have characteristics of flowers and fruits. The family is widely distributed, and is the third-largest land plant family in terms of number of species, behind only the Orchidaceae and Asteraceae , with about 751 genera and some 19,000 known species. The five largest of the genera are _ Astragalus _ (over 3,000 species), _Acacia _ (over 1000 species), _ Indigofera
Indigofera
_ (around 700 species), _Crotalaria _ (around 700 species) and _ Mimosa
Mimosa
_ (around 500 species), which constitute about a quarter of all legume species. The ca. 19,000 known legume species amount to about 7% of flowering plant species. Fabaceae
Fabaceae
is the most common family found in tropical rainforests and in dry forests in the Americas
Americas
and Africa
Africa
.

Recent molecular and morphological evidence supports the fact that the Fabaceae
Fabaceae
is a single monophyletic family. This point of view has been supported not only by the degree of interrelation shown by different groups within the family compared with that found among the Leguminosae and their closest relations, but also by all the recent phylogenetic studies based on DNA
DNA
sequences. These studies confirm that the Fabaceae
Fabaceae
are a monophyletic group that is closely related to the Polygalaceae , Surianaceae and Quillajaceae families and that they belong to the order Fabales
Fabales
.

Along with the cereals , some fruits and tropical roots a number of Leguminosae have been a staple human food for millennia and their use is closely related to human evolution .

A number of important agricultural and food plants, including _Glycine max_ (soybean ), _ Phaseolus _ (beans), _ Pisum
Pisum
sativum_ (pea ), _Cicer arietinum_ (chickpeas ), _ Medicago
Medicago
sativa_ (alfalfa ), _ Arachis hypogaea_ (peanut ), _ Ceratonia siliqua
Ceratonia siliqua
_ (carob), and _ Glycyrrhiza glabra _ (liquorice ). A number of species are also weedy pests in different parts of the world, including: _ Cytisus scoparius _ (broom), _ Robinia pseudoacacia _ (black locust)_, Ulex europaeus _ (gorse), _ Pueraria lobata _ (kudzu), and a number of _ Lupinus
Lupinus
_ species.

CONTENTS

* 1 Etymology

* 2 Description

* 2.1 Growth habit * 2.2 Leaves * 2.3 Roots * 2.4 Flowers * 2.5 Fruit
Fruit
* 2.6 Physiology and biochemistry

* 3 Ecology

* 3.1 Distribution and habitat * 3.2 Biological nitrogen fixation * 3.3 Chemical ecology

* 4 Evolution, phylogeny and taxonomy

* 4.1 Evolution

* 4.2 Phylogeny and taxonomy

* 4.2.1 Phylogeny * 4.2.2 Taxonomy

* 5 Economic and cultural importance

* 5.1 Food and forage

* 5.2 Industrial uses

* 5.2.1 Natural gums

* 5.3 Dyes * 5.4 Ornamentals

* 6 Emblematic Leguminosae * 7 Image gallery * 8 References * 9 External links

ETYMOLOGY

The name 'Fabaceae' comes from the defunct genus _Faba_, now included in _ Vicia _. The term "faba" comes from Latin, and appears to simply mean "bean". Leguminosae is an older name still considered valid, and refers to the fruit of these plants, which are called legumes .

DESCRIPTION

_ The fruit of Gymnocladus dioicus _

Fabaceae
Fabaceae
range in habit from giant trees (like _ Koompassia excelsa _) to small annual herbs , with the majority being herbaceous perennials. Plants have indeterminate inflorescences, which are sometimes reduced to a single flower. The flowers have a short hypanthium and a single carpel with a short gynophore , and after fertilization produce fruits that are legumes.

GROWTH HABIT

The Leguminosae have a wide variety of growth forms including trees, shrubs or herbaceous plants or even vines or lianas . The herbaceous plants can be annuals, biennials or perennials, without basal or terminal leaf aggregations. Many Legumes have tendrils.They are upright plants, epiphytes or vines. The latter support themselves by means of shoots that twist around a support or through cauline or foliar tendrils . Plants can be heliophytes, mesophytes or xerophytes .

LEAVES

The leaves are usually alternate and compound. Most often they are even- or odd-pinnately compound (e.g. _ Caragana _ and _ Robinia _ respectively), often trifoliate (e.g. _ Trifolium _, _ Medicago
Medicago
_) and rarely palmately compound (e.g. _ Lupinus
Lupinus
_), in the Mimosoideae and the Caesalpinioideae commonly bipinnate (e.g. _ Acacia
Acacia
_, _ Mimosa
Mimosa
_). They always have stipules , which can be leaf-like (e.g. _ Pisum
Pisum
_), thorn-like (e.g. _ Robinia _) or be rather inconspicuous. Leaf margins are entire or, occasionally, serrate . Both the leaves and the leaflets often have wrinkled pulvini to permit nastic movements . In some species, leaflets have evolved into tendrils (e.g. _ Vicia _).

Many species have leaves with structures that attract ants that protect the plant from herbivore insects (a form of mutualism ). Extrafloral nectaries are common among the Mimosoideae and the Caesalpinioideae, and are also found in some Faboideae
Faboideae
(e.g. _Vicia sativa _). In some _ Acacia
Acacia
_, the modified hollow stipules are inhabited by ants and are known as domatia .

ROOTS

Main article: Root nodule
Root nodule

Many Fabaceae
Fabaceae
host bacteria in their roots within structures called root nodules . These bacteria, known as rhizobia , have the ability to take nitrogen gas (N2) out of the air and convert it to a form of nitrogen that is usable to the host plant ( NO3− or NH3 ). This process is called nitrogen fixation . The legume, acting as a host, and rhizobia , acting as a provider of usable nitrate, form a symbiotic relationship.

FLOWERS

" Pea
Pea
flower" redirects here. For the flour produced from peas, see pea flour . _ A flower of Wisteria sinensis _, Faboideae. Two petals have been removed to show stamens and pistil

The flowers often have five generally fused sepals and five free petals . They are generally hermaphrodite , and have a short hypanthium , usually cup shaped. There are normally ten stamens and one elongated superior ovary , with a curved style . They are usually arranged in indeterminate inflorescences . Fabaceae
Fabaceae
are typically entomophilous plants (i.e. they are pollinated by insects ), and the flowers are usually showy to attract pollinators .

In the Caesalpinioideae , the flowers are often zygomorphic , as in _ Cercis
Cercis
_, or nearly symmetrical with five equal petals in _Bauhinia _. The upper petal is the innermost one, unlike in the Faboideae
Faboideae
. Some species, like some in the genus _Senna _, have asymmetric flowers, with one of the lower petals larger than the opposing one, and the style bent to one side. The calyx, corolla, or stamens can be showy in this group.

In the Mimosoideae , the flowers are actinomorphic and arranged in globose inflorescences . The petals are small and the stamens, which can be more than just 10, have long, coloured filaments, which are the showiest part of the flower. All of the flowers in an inflorescence open at once.

In the Faboideae
Faboideae
, the flowers are zygomorphic, and have a specialized structure . The upper petal, called the banner, is large and envelops the rest of the petals in bud, often reflexing when the flower blooms. The two adjacent petals, the wings, surround the two bottom petals. The two bottom petals are fused together at the apex (remaining free at the base), forming a boat-like structure called the keel. The stamens are always ten in number, and their filaments can be fused in various configurations, often in a group of nine stamens plus one separate stamen. Various genes in the _CYCLOIDEA (CYC)/DICHOTOMA (DICH)_ family are expressed in the upper (also called dorsal or adaxial) petal; in some species, such as _Cadia _, these genes are expressed throughout the flower, producing a radially symmetrical flower.

FRUIT

Main article: Legume _ Legume of Vicia angustifolia _

The ovary most typically develops into a legume . A legume is a simple dry fruit that usually dehisces (opens along a seam) on two sides. A common name for this type of fruit is a "pod", although that can also be applied to a few other fruit types. A few species have evolved samarae , loments , follicles , indehiscent legumes, achenes , drupes , and berries from the basic legume fruit.

PHYSIOLOGY AND BIOCHEMISTRY

The Leguminosae are rarely cyanogenic , however, where they are, the cyanogenic compounds are derived from tyrosine , phenylalanine or leucine . They frequently contain alkaloids . Proanthocyanidins can be present either as cyanidin or delphinidine or both at the same time. Flavonoids such as kaempferol , quercitin and myricetin are often present. Ellagic acid
Ellagic acid
has never been found in any of the genera or species analysed. Sugars are transported within the plants in the form of sucrose . C3 photosynthesis has been found in a wide variety of genera. The family has also evolved a unique chemistry. Many legumes contain toxic and indigestible substances which may be removed through various processing methods. Pterocarpans are a class of molecules (derivatives of isoflavonoids ) found only in the Fabaceae.

ECOLOGY

DISTRIBUTION AND HABITAT

The Fabaceae
Fabaceae
have an essentially worldwide distribution, being found everywhere except Antarctica and the high arctic. The trees are often found in tropical regions, while the herbaceous plants and shrubs are predominant outside the tropics.

BIOLOGICAL NITROGEN FIXATION

_ Roots of Vicia _ with white root nodules visible. _ Cross-section through a root nodule of Vicia _ observed through a microscope.

Biological nitrogen fixation (BNF, performed by the organisms called diazotrophs ) is a very old process that probably originated in the Archean eon when the primitive atmosphere lacked oxygen . It is only carried out by Euryarchaeota and just 6 of the more than 50 phyla of bacteria . Some of these lineages co-evolved together with the flowering plants establishing the molecular basis of a mutually beneficial symbiotic relationship. BNF is carried out in nodules that are mainly located in the root cortex, although they are occasionally located in the stem as in _ Sesbania rostrata _. The spermatophytes that co-evolved with actinorhizal diazotrophs (_ Frankia _) or with rhizobia to establish their symbiotic relationship belong to 11 families contained within the Rosidae clade (as established by the gene molecular phylogeny of _rbcL_, a gene coding for part of the RuBisCO
RuBisCO
enzyme in the chloroplast ). This grouping indicates that the predisposition for forming nodules probably only arose once in flowering plants and that it can be considered as an ancestral characteristic that has been conserved or lost in certain lineages. However, such a wide distribution of families and genera within this lineage indicates that nodulation had multiple origins. Of the 10 families within the Rosidae, 8 have nodules formed by actinomyces ( Betulaceae , Casuarinaceae , Coriariaceae , Datiscaceae , Elaeagnaceae , Myricaceae , Rhamnaceae and Rosaceae ), and the two remaining families, Ulmaceae and Fabaceae
Fabaceae
have nodules formed by rhizobia.

The rhizobia and their hosts must be able to recognize each other for nodule formation to commence. Rhizobia are specific to particular host species although a rhizobia species may often infect more than one host species. This means that one plant species may be infected by more than one species of bacteria. For example, nodules in _Acacia senegal _ can contain seven species of rhizobia belonging to three different genera. The most distinctive characteristics that allow rhizobia to be distinguished apart are the rapidity of their growth and the type of root nodule that they form with their host. Root nodules can be classified as being either indeterminate, cylindrical and often branched, and determinate, spherical with prominent lenticels. Indeterminate nodules are characteristic of legumes from temperate climates, while determinate nodules are commonly found in species from tropical or subtropical climates.

Nodule formation is common throughout the leguminosae, it is found in the majority of its members that only form an association with rhizobia, which in turn form an exclusive symbiosis with the leguminosae (with the exception of _Parasponia_, the only genus of the 18 Ulmaceae genera that is capable of forming nodules). Nodule formation is present in all the leguminosae sub-families, although it is less common in the Caesalpinioideae. All types of nodule formation are present in the sub-family Papilionoideae: indeterminate (with the meristem retained), determinate (without meristem) and the type included in _Aeschynomene_. The latter two are thought to be the most modern and specialised type of nodule as they are only present in some lines of the Papilionoideae sub-family. Even though nodule formation is common in the two monophyletic subfamilies Papilionoideae and Mimosoideae they also contain species that do not form nodules. The presence or absence of nodule-forming species within the three sub-families indicates that nodule formation has arisen several times during the evolution of the leguminosae and that this ability has been lost in some lineages. For example, within the genus _Acacia_, a member of the Mimosoideae, _A. pentagona_ does not form nodules, while other species of the same genus readily form nodules, as is the case for _ Acacia
Acacia
senegal_, which forms both rapidly and slow growing rhizobial nodules.

CHEMICAL ECOLOGY

A large number of species within many genera of leguminous plants, e.g. _ Astragalus _, _ Coronilla _, _ Hippocrepis _, _ Indigofera
Indigofera
_, _Lotus _, _ Securigera _ and _Scorpiurus _, produce chemicals that derive from the compound 3-nitropropanoic acid (3-NPA, beta-nitropropionic acid ). The free acid 3-NPA is an irreversible inhibitor of mitochondrial respiration , and thus the compound inhibits the tricarboxylic acid cycle . This inhibition caused by 3-NPA is especially toxic to nerve cells and represents a very general toxic mechanism suggesting a profound ecological importance due to the big number of species producing this compound and its derivatives. A second and closely related class of secondary metabolites that occur in many species of leguminous plants is defined by isoxazolin-5-one derivatives. These compounds occur in particular together with 3-NPA and related derivatives at the same time in the same species, as found in _ Astragalus canadensis_ and _ Astragalus collinus_. 3-NPA and isoxazlin-5-one derivatives also occur in many species of leaf beetles (see defense in insects ).

EVOLUTION, PHYLOGENY AND TAXONOMY

EVOLUTION

The order Fabales
Fabales
contains around 7.3% of eudicot species and the greatest part of this diversity is contained in just one of the four families that order contains: Fabaceae. This clade also includes the Polygalaceae , Surianaceae and Quillajaceae families and its origins date back 94 to 89 million years, although it started its diversification some 79 to 74 million years ago. In fact, the Fabaceae
Fabaceae
have diversified during the early tertiary to become a ubiquitous part of the modern earth’s biota , along with many other families belonging to the flowering plants.

The Fabaceae
Fabaceae
have an abundant and diverse fossil record, especially for the Tertiary
Tertiary
period. Fossils of flowers, fruit, leaves, wood and pollen from this period have been found in numerous locations. The earliest fossils that can be definitively assigned to the Fabaceae appeared in the late Palaeocene (approximately 56 million years ago). Representatives of the 3 sub-families traditionally recognised as being members of the Fabaceae
Fabaceae
– Cesalpinioideae, Papilionoideae and Mimosoideae — as well as members of the large clades within these sub-families – such as the genistoides – have been found in periods a little later, starting between 55 and 50 million years ago. In fact, a wide variety of taxa representing the main lineages in the Fabaceae
Fabaceae
have been found in the fossil record dating from the middle to the late Eocene , suggesting that the majority of the modern Fabaceae
Fabaceae
groups were already present and that a broad diversification occurred during this period. Therefore, the Fabaceae
Fabaceae
started their diversification approximately 60 million years ago and the most important clades separated some 50 million years ago. The age of the main Cesalpinioideae clades have been estimated as between 56 and 34 million years and the basal group of the Mimosoideae as 44 ± 2.6 million years. The division between Mimosoideae and Faboideae
Faboideae
is dated as occurring between 59 and 34 million years ago and the basal group of the Faboideae
Faboideae
as 58.6 ± 0.2 million years ago. It has been possible to date the divergence of some of the groups within the Faboideae, even though diversification within each genus was relatively recent. For instance, _ Astragalus _ separated from the _ Oxytropis
Oxytropis
_ some 16 to 12 million years ago. In addition, the separation of the aneuploid species of _Neoastragalus_ started 4 million years ago. _ Inga ,_ another genus of the Papilionoideae with approximately 350 species, seems to have diverged in the last 2 million years.

It has been suggested, based on fossil and phylogenetic evidence, that legumes originally evolved in arid and/or semi-arid regions along the Tethys seaway during the Palaeogene Period. However, others contend that Africa
Africa
(or even the Americas
Americas
) cannot yet be ruled out as the origin of the family.

The current hypothesis about the evolution of the genes needed for nodulation is that they were recruited from other pathways after a polyploidy event. Several different pathways have been implicated as donating duplicated genes to the pathways need for nodulation. The main donors to the pathway were the genes associated with the arbuscular mycorrhiza symbiosis genes, the pollen tube formation genes and the haemoglobin genes. One of the main genes shown to be shared between the arbuscular mycorrhiza pathway and the nodulation pathway is SYMRK and it is involved in the plant-bacterial recognition. The pollen tube growth is similar to the infection thread development in that infection threads grow in a polar manner that is similar to a pollen tubes polar growth towards the ovules. Both pathways include the same type of enzymes, pectin-degrading cell wall enzymes. The enzymes needed to reduce nitrogen, nitrogenases, require a substantial input of ATP but at the same time are sensitive to free oxygen. To meet the requirements of this paradoxical situation, the plants express a type of haemoglobin called leghaemoglobin that is believed to be recruited after a duplication event. These three genetic pathways are believed to be part of a gene duplication event then recruited to work in nodulation.

PHYLOGENY AND TAXONOMY

Phylogeny

The phylogeny of the legumes has been the object of many studies by research groups from around the world. These studies have used morphology, DNA
DNA
data (the chloroplast intron _trnL_, the chloroplast genes _rbcL_ and _matK_, or the ribosomal spacers _ITS_) and cladistic analysis in order to investigate the relationships between the family’s different lineages. Fabaceae
Fabaceae
is consistently recovered as monophyletic . The studies further confirmed that the traditional subfamilies Mimosoideae and Papilionoideae were each monophyletic but both were nested within the paraphyletic subfamily Caesalpinioideae. All the different approaches yielded similar results regarding the relationships between the family's main clades. Following extensive discussion in the legume phylogenetics community, the Legume Phylogeny Working Group reclassified Fabaceae
Fabaceae
into six subfamilies, which necessitated the segregation of four new subfamilies from Caesalpinioideae and merging Caesapinioideae _sensu stricto_ with the former subfamily Mimosoideae.

Fabales
Fabales

Polygalaceae (outgroup )

Surianaceae (outgroup)

Quillajaceae (outgroup)

FABACEAE

Cercidoideae

Detarioideae

Duparquetioideae

Dialioideae

Caesalpinioideae

Faboideae
Faboideae

Taxonomy

The Fabaceae
Fabaceae
are placed in the order Fabales
Fabales
according to most taxonomic systems, including the APG III system . The family now includes six subfamilies:

* CERCIDOIDEAE : 12 genera and ~335 species. Mainly tropical. _ Bauhinia _, _ Cercis
Cercis
_. * DETARIOIDEAE : 84 genera and ~760 species. Mainly tropical. _ Amherstia _, _ Detarium _, _ Tamarindus _. * DUPARQUETIOIDEAE : 1 genus and 1 species. West and Central Africa. _ Duparquetia _. * DIALIOIDEAE : 17 genera and ~85 species. Widespread throughout the tropics. _ Dialium _. * CAESALPINIOIDEAE : 148 genera and ~4400 species. Pantropical . _ Caesalpinia _, _Senna _, _ Mimosa
Mimosa
_, _ Acacia
Acacia
_. Includes the former subfamily Mimosoideae (80 genera and ~3200 species; mostly tropical and warm temperate Asia
Asia
and America). * FABOIDEAE (PAPILIONOIDEAE ): 503 genera and ~14,000 species. Cosmopolitan . _ Astragalus _, _ Lupinus
Lupinus
_, _ Pisum
Pisum
_.

ECONOMIC AND CULTURAL IMPORTANCE

Legumes are economically and culturally important plants due to their extraordinary diversity and abundance, the wide variety of edible vegetables they represent and due to the variety of uses they can be put to: in horticulture and agriculture, as a food, for the compounds they contain that have medicinal uses and for the oil and fats they contain that have a variety of uses.

FOOD AND FORAGE

The history of legumes is tied in closely with that of human civilization, appearing early in Asia
Asia
, the Americas
Americas
(the common bean , several varieties) and Europe
Europe
(broad beans) by 6,000 BCE , where they became a staple, essential as a source of protein.

Their ability to fix atmospheric nitrogen reduces fertilizer costs for farmers and gardeners who grow legumes, and means that legumes can be used in a crop rotation to replenish soil that has been depleted of nitrogen . Legume seeds and foliage have a comparatively higher protein content than non-legume materials, due to the additional nitrogen that legumes receive through the process. Legumes are commonly used as natural fertilizers. Some legume species perform hydraulic lift , which makes them ideal for intercropping .

Farmed legumes can belong to numerous classes, including forage , grain , blooms, pharmaceutical/industrial, fallow/green manure and timber species, with most commercially farmed species filling two or more roles simultaneously.

There are of two broad types of FORAGE LEGUMES. Some, like alfalfa , clover , vetch , and _ Arachis _, are sown in pasture and grazed by livestock. Other forage legumes such as _ Leucaena _ or _ Albizia _ are woody shrub or tree species that are either broken down by livestock or regularly cut by humans to provide stock feed.

GRAIN LEGUMES are cultivated for their seeds , and are also called pulses . The seeds are used for human and animal consumption or for the production of oils for industrial uses. Grain legumes include both herbaceous plants like beans , lentils , lupins , peas and peanuts . and trees such as carob , mesquite and tamarind .

BLOOM LEGUME species include species such as lupin , which are farmed commercially for their blooms as well as being popular in gardens worldwide. _ Laburnum _, _ Robinia _, _ Gleditsia _, _ Acacia
Acacia
_, _Mimosa _, and _ Delonix
Delonix
_ are ornamental trees and shrubs .

INDUSTRIAL FARMED LEGUMES include _ Indigofera
Indigofera
_, cultivated for the production of indigo , _ Acacia
Acacia
_, for gum arabic , and _ Derris _, for the insecticide action of rotenone , a compound it produces.

FALLOW or GREEN MANURE legume species are cultivated to be tilled back into the soil to exploit the high nitrogen levels found in most legumes. Numerous legumes are farmed for this purpose, including _ Leucaena _, _ Cyamopsis _ and _ Sesbania _.

Various legume species are farmed for TIMBER PRODUCTION worldwide, including numerous _ Acacia
Acacia
_ species, _ Dalbergia _ species, and _ Castanospermum australe _.

Melliferous plants offer nectar to bees and other insects to encourage them to carry pollen from the flowers of one plant to others thereby ensuring pollination .A number of legume species are good nectar providers such as alfalfa , white clover , sweet clover and various Prosopis species. Many plants in the _Fabaceae_ family are an important source of pollen for the bumblebee species _Bombus hortorum _. This bee species is especially fond of one species in particular; _ Trifolium pratense _, also known as red clover, is a popular food source in the diet of _ Bombus hortorum _.

INDUSTRIAL USES

Natural Gums

Natural gums are vegetable exudates that are released as the result of damage to the plant such as that resulting from the attack of an insect or a natural or artificial cut. These exudates contain heterogeneous polysaccharides formed of different sugars and usually containing uronic acids . They form viscous colloidal solutions. There are different species that produce gums. The most important of these species belong to the leguminosae. They are widely used in the pharmaceutical, cosmetic, food and textile sectors. They also have interesting therapeutic properties; for example gum arabic is antitussive and anti-inflammatory . The most well known gums are tragacanth (_ Astragalus gummifer_), gum arabic (_ Acacia
Acacia
senegal _) and guar gum (_ Cyamopsis tetragonoloba _).

DYES

Indigo
Indigo
colorant

The species used to produce dyes include the following: Logwood _Haematoxylon campechianum_; a large spiny tree that can grow up to 15 m tall. Its cork is thin and soft and its wood is hard. The heartwood is used to produce dyes that are red and purple. The histological stain called haematoxylin is produced from this species. Brazilwood tree (_ Caesalpinia echinata _) is similar to the previous tree but smaller and with red or purple flowers. The wood is also used to produce a red or purple dye. The Madras thorn (_Pithecallobium dulce_) is another spiny tree native to Latin America, it grows up to 4 m high and has yellow or green flowers that grow in florets. Its fruit is reddish and is used to produce a yellow dye. Indigo
Indigo
dye is extracted from the True indigo plant _ Indigofera
Indigofera
tinctoria _ that is native to Asia. In Central and South America dyes are produced from two species related to this species, indigo from _ Indigofera
Indigofera
suffruticosa _ and Natal indigo from _ Indigofera
Indigofera
arrecta_.yellow dye is extracted from _Butea monosperma_ commonly called as flame of the forest.

ORNAMENTALS

_ The Cockspur Coral Tree
Tree
Erythrina crista-galli _ is one of many leguminosae used as ornamental plants . In addition, it is the National Flower
Flower
of Argentina and Uruguay
Uruguay
.

Legumes have been used as ornamental plants throughout the world for many centuries. Their vast diversity of heights, shapes, foliage and flower colour means that this family is commonly used in the design and planting of everything from small gardens to large parks. The following is a list of the main ornamental legume species, listed by sub-family.

* Subfamily Caesalpinioideae: _ Bauhinia forficata _, _Caesalpinia gilliesii _, _ Caesalpinia spinosa _, _ Ceratonia siliqua
Ceratonia siliqua
_, _Cercis siliquastrum _, _ Gleditsia triacanthos _, _ Gymnocladus dioica _, _ Parkinsonia aculeata _, _ Senna multiglandulosa _. * Subfamily Mimosoideae: _ Acacia
Acacia
caven _, _ Acacia
Acacia
cultriformis _, _ Acacia
Acacia
dealbata _, _ Acacia
Acacia
karroo _, _ Acacia
Acacia
longifolia _, _Acacia melanoxylon _, _ Acacia
Acacia
paradoxa _, _ Acacia
Acacia
retinodes _, _Acacia saligna _, _ Acacia
Acacia
verticillata _, _ Acacia
Acacia
visco _, _Albizzia julibrissin _, _ Calliandra tweediei _, _ Paraserianthes lophantha
Paraserianthes lophantha
_, _ Prosopis chilensis _. * Subfamily Faboideae: _ Clianthus puniceus _, _Citysus scoparius _, _ Erythrina crista-galli _, _ Erythrina falcata _, _ Laburnum anagyroides _, _Lotus peliorhynchus _, _ Lupinus
Lupinus
arboreus _, _ Lupinus
Lupinus
polyphyllus _, _Otholobium glandulosum _, _ Retama monosperma _, _ Robinia hispida _, _ Robinia luxurians _, _ Robinia pseudoacacia _, _Sophora japonica _, _Sophora macnabiana _, _ Sophora macrocarpa _, _ Spartium junceum _, _ Teline monspessulana _, _ Tipuana tipu _, _ Wisteria sinensis _.

EMBLEMATIC LEGUMINOSAE

* The Cockspur Coral Tree
Tree
(_ Erythrina crista-galli _), is the National Flower
Flower
of Argentina and Uruguay
Uruguay
. * The Elephant ear tree (_ Enterolobium cyclocarpum _) is the national tree of Costa Rica
Costa Rica
, by Executive Order of 31 August 1959. * The Brazilwood tree (_ Caesalpinia echinata _) has been the national tree of Brazil
Brazil
since 1978. * The Golden wattle _ Acacia
Acacia
pycnantha _ is Australia
Australia
’s national flower. * The Hong Kong
Hong Kong
Orchid tree _ Bauhinia blakeana _ is the national flower of Hong Kong
Hong Kong
.

IMAGE GALLERY

*

_ Acacia
Acacia
baileyana _ (Wattle) *

Loments of _ Alysicarpus vaginalis_ *

_ Calliandra
Calliandra
emarginata_ *

_ Desmodium gangeticum _ *

_ Dichrostachys cinerea _ Sickle Bush *

_ Indigofera
Indigofera
gerardiana _ *

Tendrils of _ Lathyrus odoratus _ (Sweet pea) *

Inflorescence
Inflorescence
of _ Lupinus
Lupinus
arboreus _ (Yellow bush lupin) *

_ Pisum
Pisum
sativum _ (Peas); note the leaf-like stipules *

_Smithia conferta _ *

_ Trifolium repens _ in Kullu
Kullu
District of Himachal Pradesh
Himachal Pradesh
, India
India
. *

_Kashubian vetch _ – Kashubia *

_Zornia gibbosa _

REFERENCES

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