242h. Mimosa claussenii Bentham var. pumila Barneby, var. nov., caulibus nanis 2.5-4 dm longis e caudice ligneo ortis praestans, foliorum formula a var. claussenii vix diversa.— Brazil. Goiás: 15 km s. of Niquelândia, gravelly hills in cerrado, 1000 m, 21.I.1972 (fl), Irwin (with Anderson, Stieber & Lee) 34614. — Holotypus, UB; isotypi, G, K, LE, P, NY, R, S, US.
Dwarf, amply leafy subshrubs 2.5-4 dm tall with gnarled woody caudex-branches to 1 cm diam. and axis of homotinous stem together with that of subcorymbose pseudoraceme 1.5 dm, pubescent like var. prorsiseta; leaf-formula viii-xii/ 28-45, the rachis of longer pinnae 3—8(—10.5) cm, the longer lfts (5.5-)6.5-8 mm; peduncles 2.5-6 cm; capitula without filaments ±13 mm diam. Stony hillsides in cerrado, near 1000 m, known only from the type-locality at 14°30'S in s.-centr. Goiás, Brazil.—Fl. I—II(—?).
This ambiguous plant may be visualized as a dwarfed version of var. prorsiseta, in habit simulating M. albolanata var. paucipinna, but with the broad ellipsoid pod (20-30 x 14-15 mm) of M. claussenii sensu lato. It was found in close association with the locally endemic and strongly characterized Chamaecrista burchellii (Benth.) Irwin & Barneby.