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Gum Arabic Tree

Acacia nilotica (L.) Delile

Description

provided by eFloras
An exceedingly variable species. Tree, c. 1.2-18 m high, variable in shape; bark on trunk rough, fissured, blackish, grey or brown; young branches almost glabrous to subtomentose. Stipules spinescent, up to 8 cm long. Leaf often with 1-2 petiolar glands and others between all or only the topmost of the 2-11 pairs of pin¬nae; leaflets 7-25 pairs, c. 1.5-7 mm long, c.0.5-1.5 mm wide, glabrous to pubescent. Inflorescence axillary pedunculate heads, 6-15 mm in diameter. Flowers bright yellow, involucel from near base to half way up the peduncle. Calyx 1-2 mm long, pubescent or subglabrous. Corolla 2.5-3.5 mm long, glabrous to more or less pubescent outside. Fruit very variable, indehiscent, straight or curved, glabrous to velvety, 4-22 cm long, c.1.3-2.2 cm wide. Seed blackish brown, smooth, 7-9 mm long, 6-7 mm wide, subcircular, compressed, areole 6-7 mm long, 4.5-5 mm wide.
license
cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of Pakistan Vol. 0 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of Pakistan @ eFloras.org
editor
S. I. Ali & M. Qaiser
project
eFloras.org
original
visit source
partner site
eFloras

Physical Description

provided by USDA PLANTS text
Perennial, Trees, Shrubs, W oody throughout, Nodules present, Stems erect or ascending, Stems greater than 2 m tall, Trunk or stems armed with thorns, spines or prickles, Stems solid, Stems or young twigs glabrous or sparsely glabrate, Stems or young twigs sparsely to densely hairy, Leaves alternate, Leaves clustered on spurs or fasicles, Extrafloral nectary glands on petiole, Stipules free, Stipules spinose or bristles, Leaves compound, Leaves bipinnate, Leaf or leaflet margins entire, Leaflets opposite, Leaflets 10-many, Leaves glabrous or nearly so, Inflorescences globose heads, capitate or subcapitate, Inflorescence axillary, Bracts conspicuously present, Flowers actinomorphic or somewhat irregular, Calyx 5-lobed, Calyx glabrous, Petals united, valvate, Petals white, Stamens numerous, more than 10, Stamens completely free, separate, Stamens long exserted, Filaments glabrous, Style terete, Fruit a legume, Fruit stipitate, Fruit unilocular, Fruit freely dehiscent, Fruit indehiscent, Fruit elongate, s traight, Fruit coriaceous or becoming woody, Fruit exserted from calyx, Fruit compressed between seeds, Fruit torulose or moniliform, strongly constricted between seeds, Fruit beaked, Fruit glabrous or glabrate, Fruit 3-10 seeded, Seed with elliptical line or depression, pleurogram, Seeds ovoid to rounded in outline, Seed surface smooth, Seeds olive, brown, or black.
license
cc-by-nc-sa-3.0
compiler
Dr. David Bogler
source
Missouri Botanical Garden
source
USDA NRCS NPDC
original
visit source
partner site
USDA PLANTS text