Mimosa quadrivalvis var. distachya

  • Title

    Mimosa quadrivalvis var. distachya

  • Authors

    Rupert C. Barneby

  • Scientific Name

    Mimosa quadrivalvis var. distachya (Moc. & Sessé ex DC.) Barneby

  • Description

    190b. Mimosa quadrivalvis Linnaeus var. distachya (DeCandolle) Barneby, stat. nov. Schrankia distachya DeCandolle, Prodr. 2:443. 1825.—"(fl. mex. ic. ined.) ... in Nova Hispania."—Holotypus, sheet 6331.560 in the icones of Sessé & Mociño at the Hunt Library, Pittsburgh (sub Mimosa intsia)!—Leptoglottis distachya (DeCandolle) Britton & Rose, N. Amer. Fl. 23(3): 141. 1928.

    Leptoglottis palmeri Britton & Rose, N. Amer. Fl. 23(3): 143. 1928.—"Guadalajara, Jalisco. Type collected July to October, 1886, [E.] Palmer 267.’"—Holotypus, NY!—Schrankia palmeri (Britton & Rose) Standley, Publ. Field Columbian Mus. Nat. Hist., Bot. Ser. 8: 14. 1930.—Equated with S. distachya by McVaugh, 1987: 245, fig. 34 (pod).

    Stems coarsely 4-5-angulate; leaf-formula iii— v/16-23; longer lf-stks (6-)8-21 cm, the petiole 4.5-11 cm, mostly longer than or equal to the rachis; rachis of longer pinnae 3-6 cm; longer lfts 6.5-13 x 1.8—3(—3.5) mm; longer peduncles (1 —) 1.5—3 cm; capitula without filaments 6.5-9.5 mm diam.; pods mostly 70-100 x ±3 mm, the valves ±1.5 mm wide, the replum 1.5-2 times wider, coarsely recurved-prickly with discrete aculei.

    In open grassy or weedy, sometimes wet places, from the coastal plain to 1500 m, scattered through tropical w. Mexico from s. Sinaloa to Oaxaca, inland to centr. Jalisco and s.-w. Mexico.—Fl. VII-X, sporadically later.

    The var. distachya is very close to var. quadrivalvis, but is commonly a coarser plant, with larger leaves, a higher leaf-formula, and slightly plumper capitula and longer pods. Its inland forms (including type of L. palmeri) usually have narrower and more glabrous leaflets than those of the coastal lowlands, and at anthesis are difficult to distinguish from var. jaliscensis. The present definition of var. distachya follows that of McVaugh (1987: 245).