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Rhamnaceae
The Rhamnaceae are a large Family (biology), family of flowering plants, mostly trees, shrubs, and some vines, commonly called the buckthorn family. Rhamnaceae is included in the order Rosales. The family contains about 55 genera and 950 species. The Rhamnaceae have a worldwide distribution, but are more common in the subtropical and tropical regions. The earliest fossil evidence of Rhamnaceae is from the Late Cretaceous. Fossil flowers have been collected from the Upper Cretaceous of Mexico and the Paleocene of Argentina. Leaves of family Rhamnaceae members are Simple leaf, simple, i.e., the leaf blades are not divided into smaller leaflets.Flowering Plants of the Santa Monica Mountains, Nancy Dale, 2nd Ed. 2000, p. 166 Leaves can be either alternate or opposite leaves, opposite. Stipules are present and modified into spines in many genera. In some (e.g. ''Paliurus spina-christi'' and ''Colletia paradoxa'') spectacularly so. ''Colletia'' stands out by having two axillary buds i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ceanothus
''Ceanothus'' is a genus of about 50–60 species of nitrogen-fixing shrubs and small trees in the buckthorn family (Rhamnaceae). Common names for members of this genus are buckbrush, California lilac, soap bush, or just ceanothus. ''"Ceanothus"'' comes from (''keánōthos''), which was applied by Theophrastus (371–287 BC) to an Old World plant believed to be '' Cirsium arvense''. The genus is native to North America with the highest diversity on the western coast. Some species (e.g., '' C. americanus'') are restricted to the eastern United States and southeast Canada, and others (e.g., '' C. caeruleus'') extend as far south as Guatemala. Most are shrubs tall, but '' C. arboreus'' and '' C. thyrsiflorus'', both native to California, can be small multi-trunked trees up to tall. Taxonomy There are two subgenera within this genus: ''Ceanothus'' and ''Cerastes''. The former clade is less drought-resistant, having bigger leaves. The evolution of these two clades likely started w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helinus Integrifolius, Blom, Skeerpoort, B
''Helinus'' is a genus of flowering plants in the family Rhamnaceae. They are native to tropical and subtropical regions of Africa and Asia, and may be trees, climbing shrubs or liana A liana is a long-Plant stem, stemmed Woody plant, woody vine that is rooted in the soil at ground level and uses trees, as well as other means of vertical support, to climb up to the Canopy (biology), canopy in search of direct sunlight. T ...s. They are unarmed and the branches have coiled tendrils. The alternate leaves have entire margins, and pinnately arranged venation. Species The species include: *'' Helinus integrifolius'' (Lam.) Kuntze – southern Africa *'' Helinus lanceolatus'' Brandis – Pakistan, western Himalayas, India *'' Helinus mystacinus'' (Aiton) E.Mey. ex Steud. – eastern Africa *'' Helinus spartioides'' Schinz ex Engl. – southwestern Africa References External links Rhamnaceae Rhamnaceae genera {{Rhamnaceae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Colletia Paradoxa
''Colletia'' is a genus of flowering plants in the family Rhamnaceae, with five species of spiny shrubs. All species of this genus are native to southern South America. They are non-legume nitrogen fixers. Taxonomy Species ''Colletia'' comprises the following species: * '' Colletia hystrix'' Clos - pink crucifixion thorn * '' Colletia paradoxa'' (Spreng.) Escal. - crucifixion thorn, thorn of the cross, anchor plant * '' Colletia spartioides'' Bertero ex Colla * '' Colletia spinosissima'' J.F.Gmel. * '' Colletia ulicina'' Gillies & Hook. Species names with uncertain taxonomic status The status of the following species and hybrids is unresolved: * ''Colletia crenata'' Regel ( unplaced) * ''Colletia cruzerillo'' Bertero (unplaced) * ''Colletia disperma'' Moc. & Sessé ex DC. (unplaced) * ''Colletia horrida'' Brongn. ex Drap. (unplaced) * ''Colletia velutina'' Spreng. (unplaced) Formerly placed here * '' Celtis iguanaea'' (as ''Colle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhamnus (plant)
''Rhamnus'' is a genus of about 140 accepted species of shrubs or small trees, commonly known as buckthorns, in the family Rhamnaceae. Its species range from tall (rarely to ) and are native mainly in east Asia and North America, but found throughout the temperate and subtropical Northern Hemisphere, and also more locally in the subtropical Southern Hemisphere in parts of Africa and South America. One species, the common buckthorn (''Rhamnus cathartica''), is able to flourish as an invasive species, invasive plant in parts of Canada and the United States, where it has become naturalisation (biology), naturalized. Both deciduous and evergreen species occur. The leaves are simple, long, and arranged alternately, in opposite pairs, or almost paired (subopposite). One distinctive character of many buckthorns is the way the venation (botany), veination curves upward towards the tip of the leaf. The plant bears fruits which are black or red berry-like drupes. The name is due to the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rosales
Rosales (, ) are an order of flowering plants. Peter F. Stevens (2001 onwards). "Rosales". At: Trees At: Angiosperm Phylogeny Website. At: Missouri Botanical Garden Website. (see ''External links'' below) Well-known members of Rosales include: roses, strawberries, blackberries and raspberries, apples and pears, plums, peaches and apricots, almonds, rowan and hawthorn, jujube, elms, banyans, figs, mulberries, breadfruit, nettles, hops, and cannabis. Rosales contain about 7,700 species, distributed into nine families and about 260 genera. Their type family is the rose family, Rosaceae. The largest families are Rosaceae (91/4828) and Urticaceae (53/2625). Taxonomy The order Rosales is strongly supported as monophyletic in phylogenetic analyses of DNA sequences, such as those carried out by members of the Angiosperm Phylogeny Group.Walter S. Judd, Christopher S. Campbell, Elizabeth A. Kellogg, Peter F. Stevens, and Michael J. Donoghue. 2008. ''Plant Systematics: A Phylo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jujube
Jujube (UK ; US or ), sometimes jujuba, scientific name ''Ziziphus jujuba'', and also called red date, Chinese date, and Chinese jujube, is a species in the genus '' Ziziphus'' in the buckthorn family Rhamnaceae. It is often confused with the closely related Indian jujube, '' Z.mauritiana''. The Chinese jujube enjoys a diverse range of climates from temperate to tropical, whereas the Indian jujube is restricted to warmer subtropical and tropical climates. Description It is a small deciduous tree or shrub reaching a height of , usually with thorny branches. The leaves are shiny-green, ovate-acute, long and wide, with three conspicuous veins at the base, and a finely toothed margin. The flowers are small, wide, with five inconspicuous yellowish-green petals. The fruit is an edible oval drupe deep; when immature it is smooth-green, with the consistency and taste of an apple with lower acidity, maturing brown to purplish-black, and eventually wrinkled, looking like a sma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ziziphus Mucronata, Blomme, Roodeplaat NR, C
''Ziziphus'' is a genus of spiny shrubs and small trees in the buckthorn family, Rhamnaceae. It includes 68 species native to tropical and subtropical Africa, Eurasia, and Australia and tropical South America. The leaves are alternate, entire, with three prominent basal veins, and often aromatic. The flowers are small, inconspicuous yellow-green. The fruit is an edible drupe, often very sweet and sugary, reminiscent of a date in texture and flavour. Well known species include the commonly cultivated ''Ziziphus jujuba'' (jujube), ''Ziziphus spina-christi'' from southwestern Asia, ''Ziziphus lotus'' from the Mediterranean region, and ber (''Ziziphus mauritiana''), which is found from western Africa to India. Etymology The generic name is derived via classical Latin from Hellenistic Greek, where it is presumed to have been borrowed from another language, perhaps from ''zizfum'' or ''zizafun'', the Persian word for '' Z. lotus''. Ecology ''Ziziphus'' species are used as food plan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Root Nodule
Root nodules are found on the roots of plants, primarily legumes, that form a symbiosis with nitrogen-fixing bacteria. Under nitrogen-limiting conditions, capable plants form a symbiotic relationship with a host-specific strain of bacteria known as rhizobia. This process has evolved multiple times within the legumes, as well as in other species found within the Rosid clade. Legume crops include beans, peas, and soybeans. Within legume root nodules, nitrogen gas (N2) from the atmosphere is converted into ammonia (NH3), which is then assimilated into amino acids (the building blocks of proteins), nucleotides (the building blocks of DNA and RNA as well as the important energy molecule ATP), and other cellular constituents such as vitamins, flavones, and hormones. Their ability to fix gaseous nitrogen makes legumes an ideal agricultural organism as their requirement for nitrogen fertilizer is reduced. Indeed, high nitrogen content blocks nodule development as there is no benefit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nitrogen Fixation
Nitrogen fixation is a chemical process by which molecular dinitrogen () is converted into ammonia (). It occurs both biologically and abiological nitrogen fixation, abiologically in chemical industry, chemical industries. Biological nitrogen fixation or ''diazotrophy'' is catalyzed by enzymes called nitrogenases. These enzyme complexes are encoded by the Nif gene, ''Nif'' genes (or ''Nif'' homologs) and contain iron, often with a second metal (usually molybdenum, but sometimes vanadium). Some nitrogen-fixing bacteria have symbiotic relationships with plants, especially legumes, mosses and aquatic ferns such as ''Azolla''. Looser non-symbiotic relationships between diazotrophs and plants are often referred to as associative, as seen in nitrogen fixation on rice roots. Nitrogen fixation occurs between some termites and fungus, fungi. It occurs naturally in the air by means of NOx, NOx production by lightning. Fixed nitrogen is essential to life on Earth. Organic compounds such ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paliurus Spina-christi
''Paliurus spina-christi'', commonly known as Jerusalem thorn, garland thorn, Christ's thorn, or crown of thorns, is a species of '' Paliurus'' native to the Mediterranean region, Southwest Asia and Central Asia, from Morocco and Spain east to Iran and Tajikistan. Description It is a deciduous shrub or small tree growing to 3–4 m tall. The shoots are zig-zagged, with a leaf and two stipular spines (one straight, one curved) on the outside of each kink. The leaves are oval, 2–5 cm long and 1–4 cm broad, glossy green, with an entire margin. The fruit is a dry woody nutlet centred in a circular wing 2–3.5 cm in diameter. Etymology As suggested by the Latin name, the spiny branches of this shrub were thought to be used to make the crown of thorns placed on Jesus' head before his crucifixion. ''Ziziphus spina-christi'', the Christ's thorn jujube, is also identified as being used for the crown of thorns. Use It is viewed as an ornamental curiosity and is cul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhamnus Pumila
Rhamnus may refer to: * Rhamnus (city), or Rhamnous, an ancient Greek city in Attica * Rhamnus (Crete), or Rhamnous, an ancient Greek town in Crete * Rhamnus, an augur killed by Nisus and Euryalus in book IX of The Aeneid * Rhamnus (plant), ''Rhamnus'' (plant) or buckthorns, a plant genus * 9316 Rhamnus, a main-belt asteroid discovered in 1988 * Mount Rhamnus, a mountain in Antarctica {{disambiguation, geo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
