Monographs Details: Senna pendula var. dolichandra 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.
Description:Variety Description - Shrubs of unknown stature, not perceptibly different from var. indistincta except in the androecium, this unique in S. pendula, the 2 long filaments 11-12 mm, their linear-lanceolate anther 13-14 x 1.1-1.5 mm, its beak 0.5-0.6 x 1 mm; ovules ±100; pod unknown.—Collections: 2. [Key: "Lfts obovate or oblanceolate, rarely elliptic-oblanceolate, broadest above (exceptionally near) the middle; range of the whole sp. Style 5-10 mm and filaments of 2 long stamens (10-)11-20 mm. Plants of Brazil, Peru and s. through Bolivia to Paraguay and n. Argentina. Lfts not sharply reticulate on either face, the tertiary venulation faint or erratic or immersed. Anther of 2 long abaxial stamens 13-14 mm, as long or a trifle longer than its filament; local in n.-e. Minas Gerais and Paraiba, Brazil."]
Distribution and Ecology - Habitat not recorded, but to be expected in weedy thickets or at edge of woodland below 400 m, known only from the type-locality in the lower Jequetinonha valley in n.-e. Minas Gerais and from an unrecorded locality in Paraiba (Coelho de Moraes 2183, NY)—Fl. IV—VI.
Discussion:The present variety has everything in common with var. indistincta except for the two extraordinary latero-abaxial anthers which attain or slightly surpass in length their own long filament. In no other form of S. pendula have we encountered long anthers over 11 mm in length and these are commonly raised on a filament longer than themselves, always so if 8 mm long or more, the relative proportion between filament and anther being therefore highly individual in this case. The two known collections of var. dolichandra are so nearly identical morphologically that we cannot doubt they are genetically related and not merely sports of independent origin. There is no ready explanation, however, for the improbable distance, not less than 600 km, between the two localities. Further collecting may show one of our two records to be weedy or incorrectly labelled, or intermediate stations may turn up in Bahia; but for the present one cannot do more than guess.
Minas Gerais Brazil South America
| Paraíba Brazil South America