Senna pilifera var. tubata H.S.Irwin & Barneby

  • Authors

    Howard S. Irwin, Rupert C. Barneby

  • Authority

    Irwin, Howard S. & Barneby, Rupert C. 1982. The American Cassiinae. A synoptical revision of Leguminosae tribe Cassieae subtrib Cassiinae in the New World. Mem. New York Bot. Gard. 35, part 1: 1-454.

  • Family

    Caesalpiniaceae

  • Scientific Name

    Senna pilifera var. tubata H.S.Irwin & Barneby

  • Type

    Holotypus, NY; isotypus, NY.

  • Description

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    Variety Description - Habit of var. subglabra, the (? always) solitary erect or ascending stem 5-15 dm; long sepals 5-6 mm; longest petal 13-17 mm; otherwise as in key. [Key: "Stems erect or strongly assurgent (0.6-) 1-2.4 m; lf-rachis 3-6(-9) mm; fls smaller, either the long sepals 4.5-7.5(-8.5) mm or the longest petal (12-) 13-23(-26) mm, or both; anthers of 3 abaxial stamens 4.5-10 mm; seeds 3-5 mm long, the testa castaneous; allopatric, except for emphatically smaller-fld var. tubata. Style trumpet-shaped, distally dilated up to the suberect stigmatic cavity, this 0.7-1 mm diam; lfts glabrous on both faces and, when mature, coarsely reticulate dorsally (as var. pilifera); anthers of 3 abaxial stamens 4.5-5.5 mm; Andean foothills in Bolivia and local (riparian or weedy, possibly introduced) on the Parana and Paraguai rivers in Paraguay and s.-w. Brazil (Mato Grosso)."]—Collections: 10.

    Distribution and Ecology - Habitat not recorded, to be expected in brush or pastures near 900-1500 m, Andean foothills on the sources of Rio Beni in La Paz (Larecaja; Las Yungas), Bolivia; also in cultivated ground or at edge of woods, near 300 m, at scattered points on the upper Paraguai and Parana rivers in Paraguay (Alto Paraguay) and Brazil (Bataguagu, Mato Grosso), here perhaps only ruderal.—Fl. IV-V, IX.

  • Discussion

    This has the habit, the thin-textured, dorsally glaucescent leaflets and the small flowers and seeds of var. subglabra, but is allopatric and notable in the species as a whole for the dilated, trumpet-shaped style. We surmise that it is native in the foothills of the Bolivian Andes and only of secondary occurrence as an agricultural weed along the great rivers southward.

  • Distribution

    La Paz Bolivia South America| Alto Paraguay Paraguay South America| Mato Grosso Brazil South America|