Mimosa dolens subsp. dolens var. pangloea

  • 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

  • Scientific Name

    Mimosa dolens subsp. dolens var. pangloea

  • Type

    352/Vb. Mimosa dolens Vellozo subsp. dolens var. pangloea Barneby, var. nov., var. dolentem caulibus simul aculeatis ac stipitato-glandulosis simulans sed ab ea foliolis, bracteis interfloralibus necnon (interdum) corollae lobulis setulis capitatis induti

  • Description

    Variety Description - Wandlike subshrubs 1.5-2.5 dm, at once armed and hispid on ribbed stems with random broad- based aculei 1.5-4 mm mixed with smaller setaculei, and viscid almost throughout with capitate-glandular setulae ±0.1-0.3 mm, the lfts either glabrous or viscid-setulose on both faces, slenderly continuously setose-marginate; leafstalks 2-4.5 cm; pinna-rachises 4-6.5 mm, the interfoliolar segments 4-6 mm; lfts 10-14-jug., oblong-elliptic, to 13-18 x 5-6 mm, the marginal nerve ±0.1 mm diam., the venation prominulous on both faces; peduncles 2-3 cm; capitula without filaments 8.5-10 mm diam., extremely dense; bracts ±3 x 0.9 mm, stipitate-glandular dorsally; corolla ±4 mm, the lobes either glandular-setulose or glabrous.

    Distribution and Ecology - In dry campo near Araucaria forest, ±870-900 m, known only from between 25° and 26°S in s.-e. Paraná, in mun. Ponta Grossa and S. Mateus do Sul.—Fl. I—III.

  • Discussion

    This remarkable member of the M. dolens aggregate, first collected by Per Dusén in March 1914 (4054, MO), resembles var. dolens in armature and viscid setulae, but the latter here can extend over both faces of the leaflets and up through the inflorescence. It differs more importantly in suppression of the calyx, which in var. dolens is either symmetrically or asymmetrically pappiform. In lack of calyx var. pangloea resembles the almost sympatric subsp. acerba var. uncta. This, however, has unarmed stems, resinous from sessile glands but not capitate-glandular, and leaflets simply setose dorsally, glabrous above, nowhere glandular.

  • Distribution

    Brazil South America| Paraná Brazil South America|