Monographs Details: Mimosa albolanata var. brasiliana Barneby
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:Variety Description - Stems of current year erect or ascending from diffuse or prostrate trunk and together with extended axis of inflorescence (3—)5-10 dm, the cauline lvs expanding at or immediately after anthesis of subtended capitula; setae of stems and inflorescence-axes to 2.5-5(-6) mm, the young inflorescence shaggy-silky; pinnae of larger lvs 22-32-jug; longer pinnae 3.5-5 cm, their lfts 30-44-jug. and to ±3-5 x (0.6-)0.8-1.2 mm, all glabrous facially but ciliolate; capitula without filaments (12-) 13-15 mm diam., the bracts 3-6 mm; pods (22-)25-37 x 10-13 mm, the valves densely hispid with erect-incurved brownish-yellow tapering setae to 1.5-2.5(-4) mm long and at base to 0.2-0.4 mm diam.

Distribution and Ecology - In cerrado climax and in intermittently burned campo, 950-1250 m, locally plentiful in Distrito Federal, Brazil and in upper Corumbá valley immediately to the w.; disjunct on Sa. do Cabral in centr. Minas Gerais.—F. IX-III(-V), the pods maturing slowly and long persisting.

Discussion:

This, M. claussenii and M. foliolosa are the three Pachycarpae most abundant in the Federal District. Although collected repeatedly on the University campus and in relict cerrado within Brasília city, it has never been satisfactorily named. In several respects it is intermediate between the other two, having longer pinnae and plumper capitula than M. foliolosa but smaller leaflets and shorter peduncles than M. claussenii. The flagelliform tip of setae that cloak the young inflorescence in a silky fleece is commonly lost in age, so that the fruiting stem appears more shortly and coarsely hispid. The disjunct population on Serra do Cabral is known from only one collection (Duarte 7730, NY) in mature fruit and may possibly represent a taxonomically distinct form of M. albolanata.

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