Shrubs or small trees, 2-6 m tall. Branchlets pubescent, glabrous when old, with brown lenticels. Stipules caducous, deltoid, very small; pinnae 4-8 pairs, 5-9(-16) cm, rachis pubescent with black glands at location of lowest pinnae; leaflets 5-15 pairs, linear-oblong, 7-13 × 1.5-3 mm, main vein close to upper margin, base cuneate, margin ciliate, apex acute. Heads usually 1 or 2, axillary, 2-3 cm in diam.; peduncle 2-4 cm; bracts deciduous, pubescent. Flowers white. Calyx ca. 3 mm, outside glabrous at base, puberulent at apex, 5-toothed. Petals narrowly oblanceolate, ca. 5 mm, outside pubescent. Stamens 10, sparsely pubescent, ca. 7 mm. Ovary shortly stipitate, sparsely pubescent; stigma cupular. Legume straight, strap-shaped, flat, 10-18 × 1.4-2 cm, leathery, base attenuate, pedicel to 3 cm, pubescent, beak acute, hard. Seeds 6-25, brown, glossy, narrowly ovoid, flat, 6-9 × 3-4.5 mm. Fl. Apr-Jul, fr. Aug-Oct. 2n = 104*.
Arbusto o árbol, 4–8 m, las ramitas glabras o diminutamente grisáceo-pubescentes; estípulas 0.35–0.41 cm, deciduas. Hojas con el pecíolo 1.5–4.2 cm, el nectario glandular cerca del ápice; raquis 5–16 cm, el nectario glandular en el par proximal de pinnas; pinnas (4–)6–8(9) pares; folíolos 13–21 pares por pinna, 1–2.1 X 0.24–0.45 cm, linear-oblongos, agudos en el ápice, glabros en ambas caras (pero con los márgenes muy esparcidamente ciliados cerca de la base). Infls. 2–6 fasciculadas, capituladas, 1.2–2.1 cm de diám.; pedúnculo 1.5–2 cm. Fls. blancas; cáliz 2.3–3.8 mm, pubescente distalmente; pétalos separados, 4–5.6 mm, pubescentes. Frs. (3–)5–20(–45) por capítulo, pardos y lustrosos, 10–19 X 1.3–2.1 cm, linear-oblongos; semillas 8–18, 6.7–9.6 X 4–6.3 mm, ovoides.
A large shrub or small, unarmed evergreen tree, bark greyish brown, slightly fissured, young shoots covered by tomentum. Leaves bipinnate, stiuplate, stipule setaceous; rachis 7-15 cm long, pubescent, ending in a soft bristle, common rachis 15-20 cm long, pinnae 4-9 pairs, 5-10 cm long, hairy, ending into a bristle, leaflets 10-17 pairs, sessile, c.10-13 mm long, c.2-4 mm broad, oblique, linear, oblong, acute, glabrous or subglabrous, base oblique. Flowers in globose white heads, often in pairs, peduncle 2.5-3.8 cm long, head 1.5-2.2 cm in diameter. Calyx 2-3.5 mm long, tubular-campanulate, teeth short, villous. Corolla 10-11 mm long, petals free, valvate, spathulate, pilose outside. Stamens 10, much exserted, anthers eglandular. Ovary stalked, pubescent, style filiform, stigma minute. Pod straight, flat, 12.5-20 cm long, c.1.5-2.0 cm broad, minutely pilose, acute at the apex. Stipe 1-2.5 cm long Seeds 15-25, 5.6 mm long, c.4.5 mm broad, oval, glaucous, dark brown, with a prominent U-shaped mark on either side.
Seeds 7·5-9 x 4-5 mm., elliptic to obovate.
Pods 8-18 x (1·4)1·8-2·1 cm., with a stipe up to 3 cm. long.
Calyx 2-3·5 mm. long, puberulous above outside.
Petals 4-5·25 mm. long, puberulous above outside.
Stamen-filaments 6·5-7·5 mm. long; anthers hairy.
Shrub or small tree 0·6-9 m. high; young branchlets densely grey-puberulous.
Leaves: petiole 2-4·7 cm. long, often with a gland at the junction of the lowest pair of pinnae, glands otherwise absent; rhachis (2·5)7-15 cm. long; pinnae (2)3-8 pairs, opposite; leaflets (5)7-17(21) pairs, 7-18 x 1·5-5 mm., obliquely oblong-lanceolate, acute at the apex, puberulous on the margins and sometimes also on the midrib beneath.
Unarmed shrub or small tree to 4 m high; young branchlets densely grey-puberulous. Leaves grey-puberulous: petiole 2-4.5 cm long, often with a gland at the junction of the lowest pair of pinna, glands otherwise absent; rhachis (2.5)7-15 cm long; pinnae (2)3-8 opposite pairs; rhachillae 4-8.5 cm long; leaflets 7-20 pairs, 7-15 x 1.5-4 mm, obliquely oblong-lanceolate, acute apically, puberulous on the margins and sometimes also on the midrib beneath, sometimes glabrous throughout. Flowers white to pale yellowish-white, in heads up to 1.8 cm in diameter; peduncles up to 3.5 cm long, grey-puberulous. Calyx 2-3.5 mm long, densely pubescent apically. Petals 3.5-5 mm long, puberulous apically. Stamens 10, free, filaments 6-7.5 mm long; anthers with scattered hairs. Ovary up to 2 mm long, densely pubescent apically. Pods light to dark brown, 10-18 x 1.4-1.8 cm, with a stipe up to 2.5 cm long, oblong, compressed, thinly subcoriaceous, raised over the seeds, dehiscing into 2 non-recurving valves. Seeds 7-9 x 3.5-5 mm, elliptic to obovate, glossy.
Leucaena leucocephala grows as a shrub to medium size tree up to 10 meters in height. The evenly, bipinnately compound leaves are arranged alternately and to 10 cm in length. The leaflets are in 11-17 pairs, oblong with an acute leaf apex and entire margin. Between the lower-most pinnae there may be a small circular depressed gland. The base of the petiole and leaflets are swollen.The complete, perfect, actinomorphic flowers are arranged in heads. The calyx has 4 fused green sepals forming a short tube. The corolla has 5 unfused green petals. There are 10 white stamens 5 times the length of the corolla. The ovary is superior and has a single locule. The fruit is a brown legume at maturity.
Leucaena leucocephala grows in Human Altered environments such as roadsides, abandoned fields as well as the edges of Dry Broadleaf Evergreen Formations (coppice).
Leucaena leucocephala occurs on all island groupings within the Lucayan Archipelago as well as Florida, the Caribbean region and tropical and subtropical regions of the world.
Leucaena leucocephala is used in the Lucayan Archipelago to treat colds, fevers and flu, in strengthening teas, circulatory problems (heart issues), to calm nerves, to treat tuberculosis, and to reduce back pain and menstrual cramps. The leaves and seeds are edible if sufficiently cooked. The seeds can be roasted, ground and used as a coffee substitute.Leucaena leucocephala was originally introduced as feed for animals since it grew so quickly. Unbeknownst it actually contains trace amounts of toxin that causes certain animals to lose their hair.As Leucaena leucocephala grows rapidly it has also been used for charcoal production and to provide shade for coffee and cacao.
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