Senna dariensis (Britton & Rose) H. S. Irwin & Barneby

Chamaefistula dariensis Britton & Rose, sp. nov
A vine-like shrub with zigzag, short-pubescent branches. Petioles 1-2 cm. long; rachis liearing a large obtuse gland between the lower pair of leaflets; leaflets very unequal, broadly elliptic or suborbicular, the upper pair sometimes 2 dm. long, abruptly acuminate, glabrate above, strongly reticulated and short-pubescent beneath, the lower pair much smaller, ovate; inflorescence a terminal, many-flowered, short-pubescent panicle; pedicels about 1.5 cm. long; sepals and petals very pubescent; petals pale yellow, 1.5 cm. long; ovary densely appressedpubescent.
Forest around Pinogana, southern Darien, Panama, April 1914, Pittier 6579.