Monographs Details: Senna oxyphylla var. oxyphylla
Authors:Howard S. Irwin, Rupert C. Barneby
Authority: Irwin, Howard S. & Barneby, Rupert C. 1982. The American Cassiinae. A synoptical revision of Leguminosae tribe Cassieae subtrib Cassiinae in the New World. Mem. New York Bot. Gard. 35, part 1: 1-454.
Discussion:

10a. Senna oxyphylla (Kunth) Irwin & Barneby var. oxyphylla. Cassia oxyphylla Kunth, 1822-3, l.c., sens. str.—"Crescit in monte Cocollar, alt. 400 hex. (Nova Andalusia [hodie Estado Sucre, Venezuela])."—Holotypus, labelled ‘n. 253. Cocollar,’ collected by Humboldt & Bonpland IX. 1799, P-HBK! isotypus, B (hb. Willd, 7931)! = F Neg. 1722.—Chamaefistula oxyphylla (Kunth) G. Don, Gen. Hist. Diehl. Pl. 2: 451. 1832.

Chamaefistula axillaris Pittier, Arb. y Arbust. Nuev. Venezuela, Decad. 6-8: 89. 1927.—"Miranda: Alrededores de Petare . . . flores Septiembre 11, 1921 (Pittier 9801, tipo)."—Holotypus, VEN! = NY Neg. 6329; isotypus, NY! = NY Neg. 4963.—Cassia axillaris Pittier, Cat. Pl. Venez., 3rd Conf. Interamer. Agric. Caracas 371. 1945, pro syn.; non C. axillaris Sesse & Mocino, 1894.

Chamaefistula foliosa Pittier, Arb. y Arbust. Nuev. Venezuela, Decad. 6-8: 90. 1927.—"Distrito Federal: El Limon, valle de Puerto La Cruz (Jahn 1301, tipo)."—Holotypus, VEN! = NY Neg. 6321; isotypi, K, NY, US!—Cassia foliosa (Pittier) Pittier, Cat. Pl. Venez., 3rd Conf. Interamer. Agric. Caracas 371. 1945, pro syn.

Chamaefistula hemicardia Pittier, Arb. y Arbust. Nuev. Venezuela, Decad. 6-8: 91. 1927.— "Miranda: Alrededores de la estacion Las Mostazas [entre Los Teques y Tejerfas], en el Gran Ferro-Carril de Venezuela, 963 m; fl. Nov. 1924 (A. Allart 199, tipo)."—Holotypus, VEN! = NY Neg. 6322; isotypi (fr jun), A! & (fl), NY, US!—Cassia hemicardia (Pittier) Pittier, Cat. Pl. Venez., 3rd Conf. Interamer. Agric. Caracas 371. 1945, pro syn.—Ch. hemicardia sensu Pittier, 1928, p. 124.

Chamaefistula pumila Britton & Rose ex Pittier, Bol. Ministerio de Relac. Exter. 1-3: 122. 1928.—". . . alrededores de Curucutf y Tacagua, D[istrito] F[ederal, Venezuela], de 50-900 m. de altitud."—Lectoholotypus, labelled "Foot of Curucutf valley, 150 m, . . . 30.VIII. 1927 (fl), Pittier 12452" and annotated "pumila" by Britton, NY! isolectotypi, A, US!

Chamaefistula tortiramis Pittier, Cat. Pl. Venez., 3rd Conf. Interamer. Agric. Caracas 372, 1945, sine descr.—"[Venezuela, Distrito Federal:] Entre Catia y Blandfn [20.XI. 1926 (fr)] (Pittier 12247)."—Specimina authent., VEN! = NY Neg. 6325, NY, US!

Cassia oxyphylla sensu Humboldt, Bonpland & Kunth, Nov. Gen. & Sp. 6(qu): 342. 1824; Bentham, 1871, p. 521, t. 61, ex parte, exclus. syn. C. fagifolia, C. hartwegii. Chamaefistula oxyphylla sensu Pittier, 1928, p. 124.

Variable in pubescence, the foliage and young branchlets thinly strigulose with appressed hairs to 0.2-0.4 mm or thinly to densely pilosulous with erect or loosely incurved ones to 0.3-0.65 mm; petioles mostly 1-3 cm; long petals (6-)7-12(-14) mm; otherwise as given in key to varieties.—Collections: 98.

Thickets on sunny hillsides, stream-banks, shady ravines, sometimes in humid forest, 15-1300 m, widespread along the n. slope and near crest on s. slope of Cordillera Costanera in Venezuela, from Sucre and adjoining Anzoategui w. to Maracaibo Basin in Zulia, s.-w. along the e. Cordillera of the Andes to Trujillo and Portuguesa, extending feebly into Norte de Santander in Colombia.—Fl. (III-)V-XII.—Candelilla; Cigarron; Brusca.