Senna pallida (Vahl) H. S. Irwin & Barneby

Peiranisia deamii Britton, sp. nov
A shrub, about 2 m. high, the twigs and petioles rather densely villous. Stipules setaceous, 2-3 mm. long; gland narrowly oblong-clavate, about 2,5 mm, long, borne between the lower pair of leaflets; leaves only about 3 cm, long; leaflets 2-4 pairs, 8-15 mm, long, sub-chartaceous, obovate to elliptic, papillose-pubescent on both sides, the apex rounded, retuse or subtruncate; peduncles mostly 2-flowered, villous, 1.5-2 cm. long; pedicels villous, about as long as the peduncles; petals elliptic to suborbicular, very unequal, glabrate, the larger about 9 mm. long; petals broad, 2-3 cm. long; legume very narrowly linear, 12 cm. long, only 3.5 mm. wide, minutely tipped, stipitate, sparingly pubescent, impressed between the seeds.
Gualan, Guatemala, January 14, 1905, Charles C. Deant 291.

Perennial, Trees, Shrubs, Stems woody bel ow, or from woody crown or caudex, Stems erect or ascending, Stems 1-2 m tall, Stems greater than 2 m tall, Stems solid, Stems or young twigs glabrous or sparsely glabrate, Stems or young twigs sparsely to densely hairy, Leaves alternate, Leaves petiolate, Extrafloral nectary glands on petiole, Stipules inconspicuous, absent, or caducous, Stipules green, triangulate to lanceolate or foliaceous, Stipules setiform, subulate or acicular, Stipules deciduous, Stipules free, Leaves compound, Leaves even pinnate, Leaf or leaflet margins entire, Leaflets opposite, Leaflets 4, Leaflets 5-9, Leaves glandular punctate or gland-dotted, Leaves glabrous or nearly so, Leaves hairy on one or both surfaces, Flowers in axillary clusters or few-floweredracemes, 2-6 flowers, Inflorescences racemes, Inflorescence axillary, Bracts very small, absent or caducous, Flowers actinomorphic or somewhat irregular, Calyx 5-lobed, Calyx glabrous, Petals separate, Petals orange or yellow, Fertile stamens 6- 8, Stamens heteromorphic, graded in size, Stamens completely free, separate, Filaments glabrous, Anthers opening by basal or terminal pores or slits, Style terete, Fruit a legume, Fruit stipitate, Fruit unilocular, Fruit freely dehiscent, Fruit elongate, straight, Fruit oblong or ellipsoidal, Fruit exserted from calyx, Fruit compressed between seeds, Fruit glabrous or glabrate, Fruit 11-many seeded, Seed with elliptical line or depression, pleurogram, Seeds ovoid to rounded in outline, Seed surface smooth, Seeds olive, brown, or black.

Senna pallida là một loài thực vật có hoa trong họ Đậu. Loài này được (Vahl) H.S.Irwin & Barneby miêu tả khoa học đầu tiên.