106. Calliandra santosiana Glaziou [Mem. Bull. Soc. Bot. France 3: 188. 1905, nom. nud.] ex Barneby, sp. nov., inter congeneres brasilienses planaltinos conjugato-pinnatos stipulis parvis (1-3 mm) extus enerviis, foliolis foliorum majorum valde numerosis (70-88-jugis usque) parvis (±6.5-8.5 x 1.1-1.6 mm usque) secus rachin elongatam (8-13.5 cm longam) confertis, capitulis paucifloris omnino glabris, necnon filamentis vivide rubris praestans. — BRAZIL. Minas Gerais: Biribiry, 23 Mar 1892 (fl), A. Glaziou 19113. — Holotypus, P; isotypus, K.

Erect, frutescent but of unknown stature, glabrous except for rudimentary puberulence of some lf-axes, notable for slender, sparsely foliate, distally branched stems and elongate unijugate microphyllidious pinnae, the lvs subconcolorous, glossy on upper face, the capitula of red-stamened fls borne singly and 24 together at nodes of efoliate branchlets axillary to distal lvs, together forming a loose narrow panicle; phyllotaxy distichous. Stipules narrowly lanceolate or subulate 1-3 x 0.4-0.6 mm, externally nerveless, deciduous. Lf-formula i/70-88; lf-stks including obese nigrescent pulvinus 3-9 mm, at middle 0.6-1.4 mm diam; rachis of longer pinnae 8-13.5 cm, the interfoliolar segments 0.85-1.3 mm; lft-pulvinules 0.250.4 mm; lfts slightly decrescent near each end of rachis, otherwise equilong, the blades linear or linear-lanceolate from shortly auriculate base, straight or scarcely falcate, deltately subacute, the larger ones 5.5-8.5 x 1.1-1.6 mm; venation faint, the simple midrib forwardly displaced to divide blade 1:2, the weak inner posterior primary vein expiring near or short of mid-blade, the upper lft-face not clearly venulose but somewhat rugulose when dry. Peduncles 14—24 mm, ebracteate; capitula 5-9-fld, the receptacle ±1.5-2 x 2 mm; bracts minute caducous; fls (subsessile; perianth glabrous; calyx campanulate or turbinate- campanulate 1-2 x 1.5 mm, weakly 5-nerved, the deltate apiculate teeth 0.4—0.6 mm; corolla 5-6.5 mm, the ovate lobes ±3 mm; androecium 36-40-merous, nearly 2.5 cm, the stemonozone 1-1.3 mm, the tube 4.5-6 mm; no intrastaminal disc; ovary at anthesis glabrous. Pod unknown.

In white gravelly sand near 1200 m, known from two collections from the vicinity of Diamantina (Biribiry; rio dos Cristais) in n.-centr. Minas Gerais, Brazil. — Fl. II-IV.

Calliandra santosiana resembles C. renvoizeana, C. debilis, and C. longipinna, all of which are endemic to Bahia, but differs from all in leaf-formula and in red filaments, described by the collectors as rouges or vermelhas insignes. The epithet santosiana is of unknown significance.

Harms (Repert. Sp. Nov. Regni Veg. 17: 90. 1921) misinterpreted an isotype at Berlin (no longer extant) as a variety of C. fasciculata distinguished by small stipules and more numerous and smaller leaflets.