Monographs Details: Mimosa oblonga Benth. var. oblonga
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
Synonyms:Mimosa oblonga Benth.
Description:Variety Description - Cauline setae to 1.5-3 mm and intemodal aculei 1.5-4 mm; stipules 3-7 mm; leaf-stalks sub- obsolete and to 6 mm; larger lfts 3-6.5 x 0.6-1.2 mm; peduncles 15-35(-40) mm; capitula without filaments 8-11 x 4-6 mm; bracts 0.5-3 mm; calyx 0.2-0.5 mm; corolla 1.6-2.2 mm, the lobes either forwardly or retrorsely strigulose-puberulent.

Distribution and Ecology - On river banks, in campo rupestre, on rock pavement and in brejo, at elevations seldom recorded but probably between 700 and 1200 m, discontinuously dispersed in s.-e. Brazil from extreme s.-w. Minas Gerais (mun. Camanducaia) and the e. lobe of S. Paulo (Sa. da Bocaina) s.- w. through e. Paraná to n.-w. Sta. Catarina.—Fl. XII-IV.

Discussion:

Flowers of the type, and of plants collected since in Minas Gerais and Paraná, have retrostrigulose corollas, but on Sa. da Bocaina in S. Paulo the hairs of the corolla lobes are antrorse, and those of the corolla-tube are retrorse. Most examples of var. oblonga from Minas Gerais and S. Paulo have very short bracts and relatively long calyx (±0.4-0.5 mm), in contrast to longer, often emergent bracts and very small calyx (0.2-0.3 mm) prevalent in Paraná. The racial situation needs close study in the field. The single collection of var. oblonga known to me from Sta. Catarina (mun. Joaçaba w. of Caçador, Smith & Reitz 9176, NY, US) was identified by Burkart in 1969 as M. affin. ramosissima, but was not mentioned in Flora ilustrada catarinense (1979).

Distribution:Brazil South America| Minas Gerais Brazil South America| São Paulo Brazil South America| Santa Catarina Brazil South America| Paraná Brazil South America|