Senna cana var. hypoleuca (Benth.) H.S.Irwin & Barneby
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Authors
Howard S. Irwin, Rupert C. Barneby
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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.
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Family
Caesalpiniaceae
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Scientific Name
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Type
Holotypus, Martius s.n., labelled "Campi distr. adam[antini] et in inter[iori] prov. Bahiensis," M! = F Neg. 6239.—The paratypus, presumably Burchell 7933 listed by Bentham (1871, p. 584), was overlooked by us at K; presumably it represents the undescribe
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Synonyms
Cassia hypoleuca Mart.
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Description
Variety Description - At anthesis (1-)2-6 m; pubescence of var. cana; stipules erect, linear-attenuate straight 3-5.5 x 0.5-0.8 mm, caducous before full expansion of lf; glands between proximal pair 0, between second and third pair subsessile stoutly claviform-ovoid 0.8-2.5 mm, between distal pair either 0 or, when present, situated behind the pulvinules, next to or adnate to the subulate seta; lfts 3-5(-6) pairs, the distal pair (3.2-)3.5-6.5 x 1.3-2.5(-2.7) cm, (1.7-)2-3 times as long as wide; floral bracts 3-6.5 x 1.6-2 mm; pod 10-15 x 0.4-0.55 cm, compressed-tetragonal, the wings corresponding to the accessory nerves parallel to the ventral suture 1-1.8 mm wide, those parallel to the dorsal suture much narrower; seed-locules 4.5 5.5 x 2.5-3.5 mm.—Collections: 8. [Key: "Vesture of the lower face of lfts tomentulose, composed of tightly crisped, ± matted hairs mostly 0.1-0.25 mm, commonly concealing the whole surface, the intervenium, however, sometimes more thinly hairy than the always pannose-tomentulose veins; upland interior and w. Bahia to adjac. e.-centr. Goias and n.-centr. and w.-centr. Minas Gerais. Stipules linear-setiform erect, at base less than 1 mm wide, early caducous; valves of pod narrowly winged along each side of both sutures, the seed-locules consequently extending to neither margin of the fruit; local on upper Rio Contas in Bahia."]
Distribution and Ecology - Disturbed cerrado on sandstone or quartzite, 980-1300 m, highly localized on the upper Rio de Contas in s.-centr. Bahia, especially in the foothills of Pico de Almas near the town of Rio de Contas and the s. foothills of Sa. do Sincora near Barra da Estiva.—Fl. I-IV.
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Discussion
At anthesis var. hypoleuca differs materially from larger-leaved forms of var. cana only in the narrow, less persistent stipules, just as so-called Cassia dyso- phylla was supposed by Bentham to differ from C. velutina. It is now known that the stipular character of C. dysophylla is supported by no other morphological difference and is not correlated with dispersal, and we have been obliged to reduce that species to S. velutina. Here, however, the pod associated with the setiform stipule differs from that of broad-stipulate var. cana in developing not one but two winglike flanges from each valve, one approximate and parallel to the ventral suture, the other approximate and parallel to the dorsal one, yielding a sharply X-shaped cross section.
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Common Names
Açoita-cavalo
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Distribution
Bahia Brazil South America|