Senna ligustrina (L.) H. S. Irwin & Barneby

Ditremexa ligustrina (L.) Britton & Rose; Britton & Wilson,
Sci. Surv. Porto Rico and Virgin Isl. 5: 372. 1924.
Cassia ligustrina L. Sp. PI. 378. 1753.
Cas5Ja oc«den(oi!S giafcro Stahl, Est. Puerto Rico 3: 112. 1885. Not DC. 1825.
Suffrutescent or herbaceous, 0.6-2 m. high, glabrous or very nearly so throughout. Stipules linear, 6-7 mm. long; gland conic-cylindric, usually borne near the base of the petiole; leaflets 4-8 pairs, lanceolate to oblong-lanceolate, acute or acuminate, often ciliolate, 2-6 cm. long, 8-16 mm. wide, inequilateral; racemes short, mostly in a terminal corymbose panicle; pedicels 1-2 cm. long; sepals obtuse, 6-10 mm. long; petals 12-16 mm. long; legume flat or the valves slightly convex, glabrous, 7-12 cm. long, 6-8 njm. wide, somewhat curved; seeds transverse, flattened.
Type locality: Bahamas.
Distribdtion: Florida; Bahamas; Jamaica; Cuba; Hispaniola; Cayman Islands. Introduced into Bermuda and Porto Rico.

Ditremexa confusa Britton, .sp. nov
Cassia longisiliqua DC. Prodr. 2; 497. 1825. Not L.f. 1781. Cassia ligustrina Jaegeriana Urban, Symb. Ant. 5: 360. 1908. Cassia ligustrina Eggersiana Urban, loc. cit. 1908.
A shrub, or a small tree, 1-3.3 in. high, glabrous throughout. Stipules caducous; leaflets 4-7 pairs, ovate, or the upper ones lanceolate, acuminate, inequilateral, 3-7 cm. long, 1.5-2.3 cm. wide; gland conic-cylindric, borne near the base of the petiole; racemes short, few-flowered, mostly in a short, terminal, corymbose panicle; pedicels 1-1.5 cm. long; sepals suborbicular to oblong, obtuse, about 9 mm. long or shorter; petals nearly twice as long as the sepals; legume linear, glabrous, little curved, flat, about 10 cm. long, 7 mm. wide, tipped by the persistent style; impressed between the transverse seeds.
Hispaniola and Cuba. Type from between Higuey and Gato, Santo Domingo, December 6, 1909, N. Taylor 430.

Peiranisia turquinae Britton, sp. nov
A shrub, the twigs, leaves and inflorescence nearly glabrous. Leaves about S cm. long, short-petiolcd, the petiole and rachis with a few scattered hairs; glands narrowly oblong, pointed, borne on the petiole below the lower pair of leaflets and on the rachis between the two upper pairs; leaflets 6-8 pairs, lanceolate, chartaceous, 1.5-3 cm. long, sharply acute or shortacuminate, glabrous on both sides, or with a few scattered hairs on the prominent midvein beneath, the lateral venation obscure; racemes terminal or in the upper axils, several-flowered; bracts oblong-lanceolate, acutish, 8-9 mm. long; pedicels 1-2 cm. long; sepals elliptic-orbicular, nearly 1 cm. long; petals pale yellow, strongly veined, about 14 mm. long; ovary loosely pilose; anthers all beakless; legume linear, tipped, short-stipitate, nearly glabrous, 10—14 cm. long, 6-7 mm. wide, slightly impressed between the seeds.
Slopes, First and Main Peaks, Pico Turquino, Oriente, October 12-14, 1924, C. C. Bucher 7S. Species perhaps of this genus. Cassia xiphoidea Bertol. Novi Com. Bonon. 4: 415. 1840.
Pilose, the stem terete. Leaflets 6 or 7 pairs, oblong, obtuse, a subulate gland borne between the two or three lower pairs; racemes a.xillary, simple, few-flowered, nodding, much shorter than the leaves; flowers rather large, yellow; legume narrowly linear, compressed, acute, subfalcate, thick-margined, about 7.5 cm. long and 4 mm. wide, xiphoid-torulose.
Type locality: Volcan de Pacaya, Guatemala. Distribution: Known to us from description only.

Perennial, Shrubs, Herbs, Stems woody below, or from woody crown or caudex, Stems erect or ascending, Stems or branches arching, spreading or decumbent, Stems less than 1 m tall, Stems 1-2 m tall, Stems greater than 2 m tall, Stems solid, Stems or young twigs sparsely to densely hairy, Leaves alternate, Leaves petiolate, Extrafloral nectary glands on petiole, Stipules inconspicuous, absent, or caducous, Stipules conspicuous, Stipules green, triangulate to lanceolate or foliaceous, Stipules deciduous, Stipules free, Leaves compound, Leaves even pinnate, Leaf or leaflet margins entire, Leaflets opposite, Leaflets 10-many, Leaves glabrous or nearly so, Inflorescences racemes, Inflorescence panicles, Inflorescence terminal, Bracts very small, absent o r caducous, Flowers actinomorphic or somewhat irregular, Calyx 5-lobed, Calyx glabrous, Petals separate, Petals orange or yellow, Fertile stamens 6-8, Stamens heteromorphic, graded in size, Stamens completely free, separate, Filaments glabrous, Anthers opening by basal or terminal pores or slits, Style terete, Fruit a legume, Fruit stipitate, Fruit unilocular, Fruit freely dehiscent, Fruit elongate, straight, Fruit exserted from calyx, Fruit internally septate between the seeds, Fruit compressed between seeds, Fruit glabrous or glabrate, Fruit 11-many seeded, Seed with elliptical line or depression, pleurogram, Seeds ovoid to rounded in outline, Seed surface smooth, Seeds olive, brown, or black.

Senna ligustrina là một loài thực vật có hoa trong họ Đậu. Loài này được (L.) H.S.Irwin & Barneby miêu tả khoa học đầu tiên.