Monographs Details: Cassia atroglandulosa Taub.
Authors:Howard S. Irwin, Rupert C. Barneby
Authority: Irwin, Howard S. & Barneby, Rupert C. 1978. Monographic studies in Cassia (Leguminosae, Caesalpinioideae). III. Sections Absus and Grimaldia. Mem. New York Bot. Gard. 30: 1-300.
Family:Caesalpiniaceae
Description:Species Description - Shrubs to 1 m, the erect trunks when old blackish, paniculately branched distally, the densely leafy young twigs minutely puberulent and livid-verruculose, the glabrous foliage bicolored, the leaflets smooth and glutinously lustrous above, beneath livid-verruculose, the small, densely many-fld, viscid-puberulent and minutely verruculose-setulose racemes terminal to the branchlets, shortly exserted from foliage. Stipules stiffly erect, firm, narrowly lanceolate, 3-6 mm, persistent, nigrescent. Lvs ascending at narrow angles, short-petiolate, 3-6 cm; pulvinus slightly dilated, 1-1.5 mm, wrinkled when dry; petiole 3.5-10 mm, openly sulcate ventrally, narrowly wing-margined, dorsally verruculose; rachis 1-3(-3.4) cm, the marginal wings of each segment slightly widened upward and truncate at summit; lfts 3-5 pairs, ascending from rachis, face upward, on wrinkled pulvinule ± 0.3-0.5 mm, uniform in size or slightly decrescent upward, in outline obovate- cuneate, truncate-emarginate but sharply spinulose-mucronulate by the excurrent midrib, (5-) 7-19 x (2.5-)3-8(9) mm, at base subsymmetrically cuneate-attenuate, the revolute margins minutely crenulate-verruculose, the blades chartaceous, bicolored, above brown and glutinously lustrous, beneath paler brown, dull, obscurely papillate and prominently livid-verruculose, the midrib and 3-5 pairs of major secondary veins above immersed or faintly elevated, beneath sharply elevated and reddish-brown, the tertiary venation scarcely perceptible. Racemes short and dense, the several fls simultaneously expanded elevated to the level of the buds, the axis little elongating, becoming 1.5-5 cm; bracts subscarious, brown, lanceolate or lance-acuminate, 3-7 mm, perstistent; pedicels narrowly ascending, 12-21 mm, bracteolate 1-8 mm below calyx; bracteoles resembling bracts but only 2-3.5 mm, persistent; buds obovoid-ellipsoid, obtuse, viscid, remotely verruculose but not or only at base minutely puberulent; sepals (probabl' reddish) thin-textured, oblong-obovate or -elliptic obtuse, 6.5-7 x 2.3-3 mm; petals yellow, four ascending at narrow angles, unequal, 2 adaxial larger, spatulate, to 10.5-12 x 6.5-8 mm, 2 abaxial shorter and proportionately narrower, the fifth semiobovate, coiled; ovary scabrid-setulose; ovules 5-6. Pod (not seen fully ripe) ± 20-30 x 5-6 mm, the valves viscid, nigrescent, puberulent and remotely setulose; seeds unknown. — Collections: 3.

Distribution and Ecology - Campo, probably near 700 m, known only from vicinity of the type locality in the valley of Rio Tiete near 22° 10' S, 48° 35' W, Sao Paulo. — Fl. XII-I. Brasilien: S. Paulo, Campos da Bocaina (Glaziou n. 8418).

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Distribution:Brazil South America| São Paulo Brazil South America|