Senna guatemalensis var. scopulorum (Britton & Rose) H. S. Irwin & Barneby

Peiranisia scopulorum Britton & Rose, sp. nov
A shrub, the young branches densely soft-pubescent, in age glabrate. Leaves 5-12 cm. long; stipules linear, 10 mm. long, caducous; petiole 1-2 cm. long; rachis bearing a large oblong gland between the lower pair of leaflets; leaflets 5-7 pairs, broadly oblong, 1.5-3 cm. long, retuse, glabrous above, sparingly pubescent beneath; racemes axillary, 8-10 cm. long; pedicels 15 mm. long or less; sepals somewhat unequal, the larger 5 mm. long; petals 1 cm. long or less; anthers not beaked; legume glabrous, 5 cm. long, 6-8 mm. broad, cuneate at base.
On rock, Cerro Baxtla, Puebla, August, 1907, C. A. Purpus 2661.