Senna arida (Rose) H. S. Irwin & Barneby

Earleocassia arida (Rose) Britton
Cassia arida Rose, Contr. V. S. Nat. Herb. 10: 97. 1906.
Herbaceous, or suffrutescent, sometimes much branched at base, about 4 dm. high, or lower, the branches, petioles and rachis loosely villous or pilose. Petiole slender, 3-4 cm. long; leaflets 2-4 pairs, oblong, or elliptic, 1-3.5 cm. long, pubescent on both sides, or glabrate above, obtuse, or rounded, mucronate; gland between the lower pair of leaflets long and slender; peduncles 4-9 cm. long, 1 -few-flowered; sepals pubescent, 6-8 mm. long; petals nearly twice as long as the sepals; legume 3-4 cm. long, about 6 mm. wide, straight or somewhat curved, short-tipped, long-pubescent.
Type locality: Higuerillas, Queretaro. Distribution: Queretaro to Puebla and Oaxaca.