Remotely foliate virgate shrubs attaining 2.5 m with terete reddish, longitudinally striped stems, except for white-barbellate inner margins of pin- narachises glabrous, the firm lfts bicolored, lustrous olivaceous above, paler and randomly resin-spotted beneath, the few-fld capitula either solitary or geminate in the furthest lf-axils and beyond these shortly pseudoracemose. Stipules (few seen) herbaceous firm, ovate from shallowly cordate base, ±5-6 x 3.5 mm, weakly palmate-nerved, deciduous. Lf-formula i-ii /32-46; lf-stks including pulvinus 6-21 mm, the one interpinnal segment, developed in few lvs, nearly twice as long; rachis of longer pinnae 8-9.5 cm, the interfoliolar segments ±2-2.5 mm; lft-pulvinules 0.50.6 x 0.6-0.75 mm; lfts subequilong, the blade oblong-elliptic from bluntly broad-auriculate base, deltately subacute, straight, the larger ones 7.5-9 x 2.6-3 mm, 2.8-3.2 times as long as wide; venation of dorsal lft-face palmate, the straight, almost simple midrib displaced to divide blade ±1:2, the inner posterior and one anterior primary vein produced well beyond mid-blade, the 2-3 outer posterior ones progressively much shorter, a fine secondary subvertical venulation scarcely perceptible. Peduncles ±2.5-5 cm, ebracteate; capitula 3-5-fld, the homomorphic fls subsessile, the receptacle ±1-1.5 x 1.5-2 mm; bracts ovate-acuminate 2-2.5 mm, weakly 5-7-nerved, caducous; pedicels turbinate ±1 x 1.5-1.8 mm; perianth 5-7-nerved, glabrous except for few random white cilia at tip of calyx-teeth or corolla-lobes; calyx campanulate 2.5-2.8 x 2.7-3 mm, the deltate teeth separated by broad shallow sinuses; corolla 9 mm, the lobes ±4 x 3.5 mm; androecium ±56-merous, 5 cm, the stemonozone 1 mm, internally thickened, the tube 5 mm; no intrastaminal nectary. Pods (not seen) described as "10 cm x 11 mm, reddish, pilose."

About sandstone outcrops in campo rupestre, 700-1200 m, known only from the vicinity of the type-locality in Sa. do Sincorá near 12°54'S, 41°19'W in upland interior Bahia, Brazil. — Fl. II—III(—?).

Calliandra debilis is in most respects hardly different from C. longipinna, but may be distinguished technically by the larger stipules, 5-8 (not 1-3.5) mm long and the nearly glabrous, neither strigulose nor reddish-granular corolla.