Mimosa oblonga var. oblonga

Title

Mimosa oblonga var. oblonga

Author(s)

Rupert C. Barneby

Scientific Name

Mimosa oblonga Benth. var. oblonga

Description

359a. Mimosa oblonga Bentham var. oblonga. M. oblonga Bentham, 1841, l.c., sens. str.— "Brazil, Sello"—Holotypus, K! = NY Neg. 1782; isotypi, ⁺B = F Neg. 1347, F (fragm, numbered Sello 4396, doubtless ex B)! G! W!

M. oblonga sensu Bentham, 1875: 394; 1876: 313; Malme, 1931: 13, where the type-locality is identified as Santa Catarina.

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.

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.

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).