Senna tonduzii (Standl.) H. S. Irwin & Barneby

Peiranisia tonduzii (Standley) Britton & Rose
Cassia Tonduzii Standley, Contr. U. S. Nat. Herb. 20: 215. 1919.
A tree or shrub, the young branches slender, angled, brownish pubescent. Stipules subulate, deciduous; glands between most or all the pairs of leaflets long, slender, clavate, sometimes 3 mm. long; leaflets 4 or 5 pairs, lanceolate, acuminate, 2-9 cm. long, shining and glabrate above, strongly nerved and somewhat pubescent beneath; inflorescence paniculate; pedicels slender, often 2 cm. long; sepals orbicular, the outer one 5 mm. long, the inner 8-10 mm. long; petals very unequal, the larger 2.5 cm. long; perfect stamens 7, the larger ones with curved anthers I cm. long, each terminated by a slender beak 5-6 mm. long; ovary densely appressedpilose; legume 16-lS cm. long, 5-6 mm. wide, glabrate, long-stipitatc, its valves flat, thin.
Type locality: Along the Rio Tiliri, Costa Rica. Distribution: Chiapas and Costa Rica.

Peiranisia verbenensis Britton, sp. nov
A tree, 6-9 m. high, the slender twigs, the petioles and rachis sparingly pubescent. Leaflets 3 or 4 pairs, submembranous, ovate to elliptic, glabrous above, sparingly pubescent beneath, acute or obtuse, 1.5-5 cm. long; glands slender-clavate, about 3 mm. long, borne between one or more of the pairs of leaflets; peduncle axillary, very slender; immature legume linear, elongated, flat, sparingly pubescent, short-stipitate, IS cm. long, 8 mm. wide, its apex rounded, apiculate.
La Verbena, San Jose, Costa Rica, about 1200 m. altitude, January 29, 1924, Slandley 32215.

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