Senna angustisiliqua (Lam.) H. S. Irwin & Barneby

Peiranisia haitiensis Britton, .sp. nov
A shrub, about 1 m. high, the slender branches slightly flexuous and sparingly pubescent. Stipules setaceous, 4—7 mm. long; glands narrowly clavate, very slender, 3 mm. long, borne between the lowest pair of leaflets; leaflets 6-12 pairs, chartaceous, oblong, acute, dull, glaIjrous above, sparingly pubescent on the veins beneath, ciliate, 1-2 cm. long, about 5 mm. wide, the midvein prominent, the lateral venation obscure; peduncles axillary, 1-1.5 cm. long, very slender, 2-flowered; pedicels very slender, about as long as the peduncles; sepals suborbicular, rounded, the larger 5-6 ram. long; petals 1.5-2 cm. long; legume linear, long-stipitate, sparingly pubescent, 3-9 cm. long, about 6 mm. wide. «
Haiti. Type from vicinity of Ennery, I'Artibonite, at about 400 m. altitude, January 13, 1906, E. C. Leonard ST 99.

Peiranisia crista (Jacq.) Britton & Rose
Cassia crista Jacq. Ic. PI. Rar. 1: 8. 17S6.
Cassia frondosa Ait. Hort. Kew 2: 53, 17S9.
Cassia crista oligophylla Urban. Arkiv Bot. 22: A, No. 8, 33. 1929.
A shrub, 1-2 m. high, the young branches glabrous or pubescent. Stipules setaceous, deciduous; rachis bearing a club-shaped, elongated gland between the lower pair of leaflets; leaflets 4—16 pairs, thin, oblong, rounded at apex, 8-20 mm. long, glabrous on both sides or somewhat pubescent beneath; peduncles slender, axillary, 1-2.5 cm. long, mostly 3-flowered; pedicels slender; sepals nearly orbicular, 5-6 mm, long; petals 2—2.5 cm. long; ovary whitepubescent; legume 4—7 cm. long, about 6 mm. broad, sparingly pubescent, blunt.
Type locality: Florida [in error]. Distribution: Hispaniola.

Peiranisia fitchiana Britton & Rose, sp. nov
A glabrous shrub, the twigs slender. Stipules setaceous, 2-4 mm. long; leaves about 7 cm. long; gland ovoid, blunt, about 1.5 mm. long, borne between the lower pair of leaflets; leaflets 6-10 pairs, membranous, oblong, 0.8-20 mm. long, acute or the lower obtuse, very obscurely veined above, pinnately veined beneath; peduncles axillary, 2-flowered, about 1.5 cm. long; pedicels nearly as long as the peduncles; sepals suborbicular, the larger ones about 6 mm. in diameter; petals about 1.5 cm. long; two of the anthers beaked.
Hills above river, Santo Domingo City, Santo Domingo, March 9-10, 1913, Rose, Fitch and Russell 3795a.

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