Ormocarpum P.Beauv.

Genus

Angiosperms > Fabales > Fabaceae

Characteristics

Shrubs or small trees usually with two kinds of hair, (a) rather weak, caducous, white, normal hairs, (b) stiffer, darker, swollen-based hairs, which often exude a yellow more or less aromatic viscid fluid when young and whose enlarged bases may persist as small conical tubercles when old. Leaves often fasciculate on short shoots, imparipinnate (or, outside Flora area, 1-foliolate), without stipels; stipules striate, persistent; leaflets usually ± alternate, entire or minutely notched at the margins, nearly always glabrous and minutely black-dotted above, paler beneath. Flowers in axillary racemes (or rarely panicles) or solitary, the pedicel usually longer than the bract and the calyx; bracts persistent, sometimes 3-partite; bracteoles also persistent, opposite, situated at or rather below the base of the receptacle. Receptacle-cup (hypanthium) shallow, oval, longer (in the dorsiventral plane) than it is broad or deep, the ovary-base and pedicel-insertion towards its lower end. Calyx usually strongly veined, the lobes usually longer than the tube, the lower lobe longest, the 2 upper lobes united for about half their length and connivent at the tip. Corolla 9–26 mm. long, glabrous or the 3 upper petals somewhat pubescent toward the tip and at the margin, often strongly veined; blade of standard curved back at an angle to the claw with 2 ridges, knobs or scales at the base; blades of wings transversely puckered between the veins in the upper part near the base; claws of the keel longer than those of the wings; blades of keel-petals lightly attached along their lower margin. Stamens free from the petals, usually (5) + (5), i.e. divided dorsally and ventrally into 2 groups of 5, less often (10), i.e. united to form a sheath slit above, occasionally 1 + (9), i.e. the vexillary stamen free, the remainder forming an open sheath or 1 + (4) + (5) where this sheath is split on the lower side as well; staminal arrangement often inconstant within a single species or even a single specimen; anthers all alike or less often the 5 on longer filaments rather longer than the rest. Intrastaminal disc cylindrical, forming a collar round the stipe of the ovary or, less often, flat. Ovary ± stipitate, 3–9-ovulate, often becoming arcuate, i.e. curved with the upper margin convex; style curved upwards from near its centre, thin, cylindrical, glabrous or sparsely hispid near the base; stigma terminal, minute. Pod breaking transversely into 1–6 1-seeded indehiscent segments. Seed flattened, asymmetrically elliptic, without a prominent aril; hilum near one end, ± 0.5 mm. long, elliptic.
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Shrubs. Stipules triangular-spiculiform, free, not spurred, slightly connate at base, persistent. Leaves subfasciculate on short lat­eral branches, imparipinnate; leaflets alternate, subsessile. Inflorescences sparse racemes or reduced to 1 or 2 flowers on lateral shoots; bracts paired, persistent. Flowers large. Bracteoles similar to bracts. Hypanthium short. Calyx campanulate, membranous, 5-lobed; abaxial 3 lobes lanceolate and ± as long as tube, adaxial 2 lobes triangular and short. Corolla yellow, longer than calyx; standard suborbicular, with 2 appendages at base, without auricles; keels conspicuously inflexed, without a beak. Stamens diadel­phous (5+5); anthers uniform. Ovary linear, with many ovules; style filiform, inflexed; stigma terminal, small. Legume a loment (but articulations developing late), linear to oblong, inflated, shortly stipitate, rugose, glabrous or with coarse soft prickles, divided into several articles, indehiscent. Seeds 1 per article.
Leaves often fasciculate on short shoots, 1-foliolate (not in the Flora Zambesiaca area) or more usually imparipinnate; stipules striate, persistent; stipels absent; leaflets usually ± alternate, entire or minutely notched, mostly glabrous and with minute black dots above.
Shrubs or small trees with usually two kinds of indumentum, weak white deciduous hairs and stiffer tubercular-based hairs which are often aromatic and glandular and frequently persist as conical tuberculars on the older stems.
Corolla glabrous or wings and standard pubescent at their apices and margins, often strongly veined; blade of standard forming an angle with the claw and bearing two variable ridges or appendages at the base.
Flowers in axillary racemes or solitary, rarely in panicles; bracts persistent, sometimes tripartite; bracteoles persistent, opposite, at the base or just below the base of the receptacle (hypanthium).
Staminal arrangement various, monadelphous or variously divided, 5 + 5, 1 + 9 or 1 + 4 + 5, sometimes varying in a single specimen; anthers uniform, or less often alternate anthers slightly longer.
Ovary stipitate, 3–9-ovulate, often curving; style curved near its centre with the upper side concave, thin, cylindric, glabrous or sparsely hispid near the base; stigma terminal, minute.
Calyx usually strongly veined; lobes mostly longer than the tube, the lowest the longest, the two upper united for half their length and connivent at the tips.
Seeds flattened, asymmetrically ellipsoid; hilum towards one end, round or elliptic, c. 0.5 mm long, devoid of any appendages.
Pod breaking transversely into 1–6 indehiscent articles.
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Growth form shrub
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Foliage retention deciduous
Sexuality hermaphrodite
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