Senna pallida var. gaumeri (Britton & Rose) H. S. Irwin & Barneby

Peiranisia gaumeri Britton & Rose, sp. nov
A low shrub, perhaps 1 m. high, the slender twigs glabrous. Stipules subulate, 2-4 mm. long, persistent; leaves 1-4 cm. long, the short petioles glabrate; leaflets 3 or 4 pairs, orbicular to short-oblong, obtuse or retuse, sometimes mucronate, 4—10 mm. long, glabrous on both sides, or very sparingly pubescent beneath; gland very slender, subclavate, borne between the lower pair of leaflets; flowers borne in the upper axils; peduncles apparently 1 -flowered, slender, about 12 mm. long; sepals rounded or obtuse, unequal, 5-S mm. long; petals 1-1.5 cm. long.
Yucatan, C. F. Caunier 391.

Peiranisia yucatensis Britton & Rose, sp. nov
A shrub, the slender twigs, petioles and rachis short-villous. Stipules setaceous, villous, only 1 or 2 mm. long; leaves only about 2 cm. long; leaflets 3 or 4 pairs, elliptic to obovate, rounded or retuse, subchartaceous, papillose above, strigose beneath, 5-9 mm. long; gland narrowly clavate, 1.5-2 mm. long, borne between the lower pair of leaflets; peduncles axillary, apparently 1 -flowered, sparingly short-villous, 1-1.5 cm. long; legume narrowly linear, 6-8 cm. long, about 5 mm. wide, sparingly strigose, apiculate, slendcr-stipitate, impressed between the seeds.
Yucatan, 1917-1921, G. F. Ganmer & Sotts 24066.