Senna bacillaris (L. fil.) H. S. Irwin & Barneby

Chamaefistula bacillaris (L.f.) G. Don, Gen. Syst. 2: 451. 1832
? Mimosa nodosa L. Sp. PI. 516. 1753. Cassia bacillaris ,.i. Suppl. 231. 1781. Calharlocarpus Bacillus Pers. Syn. PI. 1: 459. 1805. Bactyri labium bacillare Homem. Hort. Havn. 1: 392. 1813.
A shrub or small tree, 4-6 m. high, or vine-like and up to 7 m. long, the slender twigs puberulent at least when yoimg. Stipules linear, caducous; petiole 2-4 cm. long; rachis bearing an oblong-conic blunt gland between the lower pair of leaflets; leaflets submembranous, ovate to elliptic or ovate-lanceolate, acute or acuminate, 6-12 cm. long, pale and puberulent beneath, glabrate above, very inequilateral and oblique; inflorescence mostly terminal and paniculate, large; sepals oblong, 7-11 mm. long, appressed-pubescent ; petals 18-22 mm. long, orbicularobovate to elliptic; ovary densely appressed-pubescent; legume subterete, glabrous, 10-27 cm. long, 10-14 mm. thick.
Type locality: Surinam.
Distribution: Porto Rico; St. Kitts (?); Tobago; Trinidad; Costa Rica; Panama; Colombia to Dutch Guiana and Brazil.