''Parkia bicolor'', the African locust-bean,
[ is a species of ]flowering plant
Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (), commonly called angiosperms. The term "angiosperm" is derived from the Greek words ('container, vessel') and ('seed'), and refers to those plants th ...
, a tree in the family . It is native to tropical West and Central Africa. Its natural habitat
In ecology, the term habitat summarises the array of resources, physical and biotic factors that are present in an area, such as to support the survival and reproduction of a particular species. A species habitat can be seen as the physical ...
s are tropical moist lowland forest
A forest is an area of land dominated by trees. Hundreds of definitions of forest are used throughout the world, incorporating factors such as tree density, tree height, land use, legal standing, and ecological function. The United Nations' ...
s, swampland, woodland and savanna
A savanna or savannah is a mixed woodland-grassland (i.e. grassy woodland) ecosystem characterised by the trees being sufficiently widely spaced so that the canopy does not close. The open canopy allows sufficient light to reach the ground to ...
h.
Description
''Parkia bicolor'' is a medium to large tree growing to a height of about with a trunk a metre or more in diameter with narrow, spreading buttresses. The crown is umbrella-shaped and has widely spreading branches. The young twigs are felted with short reddish-brown hairs. The leaves are alternate with ten to twenty-five pairs of pinnae, each composed of numerous pairs of small, narrow leaflets. The inflorescence is a pendulous, two-part head of small flowers, which is followed by long, dangling pods each containing up to twenty-five seeds.[
]
Distribution and habitat
''Parkia bicolor'' is found in tropical western and central Africa, its range extending from Sierra Leone eastward to Yangambi
Yangambi is a town in Isangi territory of Tshopo province, Democratic Republic of the Congo.
Location
Yangambi is on the north side of the Congo River and lies on the R408 road which connects it to Kisangani 100 kilometers to the east. This road ...
in the Democratic Republic of the Congo, and southwards to Cabinda (Angola). It typically grows in rainforest and gallery forest, as well as woodland, swampy areas and savannah. When forest is being cleared, this species is often left as isolated trees because of its useful properties.
Ecology
The flowers at the base of the flowerhead are sterile but produce plentiful nectar
Nectar is a sugar-rich liquid produced by plants in glands called nectaries or nectarines, either within the flowers with which it attracts pollinating animals, or by extrafloral nectaries, which provide a nutrient source to animal mutualists ...
which attracts bat
Bats are mammals of the order Chiroptera.''cheir'', "hand" and πτερόν''pteron'', "wing". With their forelimbs adapted as wings, they are the only mammals capable of true and sustained flight. Bats are more agile in flight than most bi ...
s. The flowers are largely pollinated by the bats, but potto
The pottos are three species of strepsirrhine primate in the genus ''Perodicticus'' of the family Lorisidae. In some English-speaking parts of Africa, they are called "softly-softlys".
Etymology
The common name "potto" may be from Wolof (a ta ...
s and dormice
A dormouse is a rodent of the family Gliridae (this family is also variously called Myoxidae or Muscardinidae by different taxonomists). Dormice are nocturnal animals found in Africa, Asia, and Europe. They are named for their long, dormant hibe ...
have also been observed visiting them.
Uses
The timber of ''Parkia bicolor'' is not highly esteemed but is used to make planks, canoes and for light construction work, joinery and turnery. Additionally, it is used to make plywood and pulpwood. The flesh of the fruit can be eaten, and the seeds can be fermented to make a condiment. The bark, leaves and roots are all used in traditional medicine
Traditional medicine (also known as indigenous medicine or folk medicine) comprises medical aspects of traditional knowledge that developed over generations within the folk beliefs of various societies, including indigenous peoples, before the ...
and the spreading crown makes this a useful shade tree.hydrolysis
Hydrolysis (; ) is any chemical reaction in which a molecule of water breaks one or more chemical bonds. The term is used broadly for substitution reaction, substitution, elimination reaction, elimination, and solvation reactions in which water ...
, this yields 74% galactose
Galactose (, '' galacto-'' + '' -ose'', "milk sugar"), sometimes abbreviated Gal, is a monosaccharide sugar that is about as sweet as glucose, and about 65% as sweet as sucrose. It is an aldohexose and a C-4 epimer of glucose. A galactose molec ...
, 9% arabinose
Arabinose is an aldopentose – a monosaccharide containing five carbon atoms, and including an aldehyde (CHO) functional group.
For biosynthetic reasons, most saccharides are almost always more abundant in nature as the "D"-form, or structurally ...
, 9.5% glucuronic acid
Glucuronic acid (from Greek γλεῦκος "''wine, must''" and οὖρον "''urine''") is a uronic acid that was first isolated from urine (hence the name). It is found in many gums such as gum arabic (c. 18%), xanthan, and kombucha tea and ...
and 7.5% 4-0-methylglucuronic acid.
Status
This is a common tree with a wide range, and is present in several protected areas. When the forest is clear felled, this tree is often preserved because of its edible and medicinal purposes. It faces no particular threats and the International Union for Conservation of Nature
The International Union for Conservation of Nature (IUCN; officially International Union for Conservation of Nature and Natural Resources) is an international organization working in the field of nature conservation and sustainable use of natu ...
has listed it as being of "least concern
A least-concern species is a species that has been categorized by the International Union for Conservation of Nature (IUCN) as evaluated as not being a focus of species conservation because the specific species is still plentiful in the wild. T ...
".
References
{{Taxonbar, from=Q15539465
bicolor
Flora of West Tropical Africa
Flora of West-Central Tropical Africa
Flora of Nigeria
Least concern plants
Taxa named by Auguste Chevalier