Senna wislizeni var. villosa (Britton) 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 2: 455-918.

  • Family

    Caesalpiniaceae

  • Scientific Name

    Senna wislizeni var. villosa (Britton) H.S.Irwin & Barneby

  • Type

    Holotypus, NY! = NY Neg. 9393; isotypi, GH, US!-Cassia wislizeni var. villosa (Britton & Rose) Irwin & Barneby, Sida 6(1): 16. 1975.

  • Synonyms

    Palmerocassia villosa Britton, Cassia wislizeni var. villosa (Britton) H.S.Irwin & Barneby

  • Description

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    Variety Description - Like var. wislizeni except for the pilosulous vesture; primary lvs 10-25 mm, with 2 or 3 pairs of lfts, the largest 3-8 mm; body of pod 7.5-16 x 0.6-0.8 cm, 24-30-ovulate, otherwise as in var. wislizeni.-Collections: 5. [Key: "Stipules of primary lvs more persistent, usually into or through maturity of the associated lf; valves of pod highly lustrous when ripe, elevated over each seed in the form of 2 transverse ridges, these sometimes joined at middle by a shorter vertical ridge; secondary venulation of lower face of lfts bluntly or sharply prominulous; centr. and n. Chihuahuan Desert n.-ward from lat. 25°N, extending feebly n.-w. into Sonora. Vesture of the whole plant pilosulous; Mapimi Depression in centr. Chihuahuan Desert in lat. 25-26°N (n.-w. Durango and adjoining Coahuila)."]

    Distribution and Ecology - Larrea scrub and matorral, in canyons and foothills of desert mountains, strongly calci (or gypso)-phile, 1250-1860 m, local around the s.-w. periphery of Mapimi Depression and the lower Nazas valley in far s.-w. Coahuila and adjacent Durango.-Fl. VI-IX.

  • Discussion

    This variety is weakly distinguished from var. wislizeni by its loose vesture but so definitely segregated geographically that we think it useful to recognize it formally. The leaflets are on the average fewer by one pair than in var. wislizeni and lead on to the related S. monozyx, its vicariant neighbor in south-central Coahuila, in which all leaves are bifoliolate.

  • Distribution

    Coahuila Mexico North America| Durango Mexico North America|