Monographs Details: Mimosa foliolosa subsp. foliolosa var. corpulenta
Authors:Rupert C. Barneby
Authority: Barneby, Rupert C. 1991. Sensitivae Censitae. A description of the genus Mimosa Linnaeus (Mimosaceae) in the New World. Mem. New York Bot. Gard. 65: 1-835.
Family:Mimosaceae
Description:Subspecies Description - Stature not determinable from specimens, but perhaps a depressed suffrutex, the stems, lf-stks and peduncles pilose with ascending rufous setae ±1-1.5 mm mixed with villi and scattered gland-tipped setulae, the lfts facially glabrous ciliolate; leaf-formula xx-xlii/20-23, the longer lf-stks 8- 14 cm, the rachis of longer pinnae 12-20 mm, the larger lfts 2-2.8 x 0.6-0.8 mm; capitula and fls unknown; pod extremely massive ±30-40 x 16-18 mm, the long-beaked replum 6-7 mm wide, this and the valves thinly villosulous and scabrous with scattered, narrowly ascending broad-based setulae less than 1 mm.

Distribution and Ecology - In unrecorded habitat, to be expected in cerrado, known only from the type-locality near the source of rio Tijuco at ±19°30'S, 48°W in the Triângulo of w. Minas Gerais.—Fr. X-XI, fl. ?

Discussion:

The type-collection of var. corpulenta contributed to the description of M. densa in Flora brasiliensis, but is very different from the distantly allopatric shrub with decorticate annotinous branchlets to which the epithet densa was originally applied. I refer var. corpulenta to M. foliolosa subsp. foliolosa because of its proportionately long leaf-rachis and short but numerous pinnae bearing about twenty pairs of leaflets less than 3 mm long. These leaves, however, are combined with an extremely massive pod not encountered elsewhere in subsp. foliolosa. The pod of subsp. pachycarpa var. gravida approaches that of var. corpulenta in girth and width of replum, but is about twice as long and coupled with much longer pinnae and larger leaflets. The only other mimosa of the pachycarpous type known to occur south of rio Paranaíba in western Minas Gerais is M. lithoreas, near Patrocínio, obviously different in humifuse inflorescence and long peduncles.

Distribution:Brazil South America| Minas Gerais Brazil South America|