Senna mexicana (Jacq.) H.S.Irwin & Barneby var. mexicana

  • 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 mexicana (Jacq.) H.S.Irwin & Barneby var. mexicana

  • Synonyms

    Cassia mexicana Jacq., Adipera mexicana (Jacq.) Britton & Rose, Cassia mexicana var. moustiquensis Urb.

  • Description

    Variety Description - Shrubs 1-2 m, more commonly pilosulous than glabrescent, when pilosulous the lfts conspicuously papillate; lvs 3-10(-13) cm; petiole (8-) 10-23 (in cultivation -35) mm; gland of var. berteriana; lfts 5-7(-8) pairs, the distal pair 13-28 x 4-10 mm, the shorter proximal pairs up to 5-10 mm wide, the margins plane, not thickened; fl and pod of var. berteriana.—Collections: 10. [Key: "Larger lvs 3-12.5(-14) cm, if over 9 cm the lfts not over 7 pairs; lfts (2-)3-7(-8) pairs. Hispaniola, Cuba, Bahamas and Florida. Margin of lfts not thickened; petiolar gland sessile or almost so; range as just given. Lfts 5-7(-8) pairs, those of distal pair 13-28 x 4-10 mm; peduncle with raceme-axis together 1-3.5 cm; pod 4.5-6 mm wide; Hispaniola."]

    Distribution and Ecology - Thickets and stony slopes in pine forest, 300-1300 m, local in interior hill- country of Hispaniola: sources of Rio Yaque del Norte in Santiago and La Vega and on Sa. Bahoruco in Barahona, Dominican Republic, w. into Haiti (dpts. de l’Ouest and Nord-Ouest).—Fl. IV, IX-XI.

  • Discussion

    The plant cultivated by Jacquin at Schoenbrunn closely matches in all essential details wild ones from the central Cordillera of Dominican Republic, differing only in having rather more drawn-out foliage and longer petioles, as might be expected in the artificial conditions of a conservatory. The var. moustiquensis represents the less common glabrate form, with hairless sepals and upper face of leaflets.

  • Distribution

    Santiago Dominican Republic South America| La Vega Dominican Republic South America| Barahona Dominican Republic South America| Nord-Ouest Haiti South America| Ouest Haiti South America|