Monographs Details: Chamaecrista desvauxii var. circumdata 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
Description:Latin Diagnosis - Chamaecrista desvauxii (Colladon) Killip var. circumdata Irwin & Barneby, var. nov., a var. mollissima, cum qua foliolorum ambitu adspectuque toto bene convenit, foliolis subcoriaceis nervo marginali crasso cartilagineo albicanti circumdatis, a var. langsdorfii imprimis foliolis late ellipticis 6-8 (nec 2-6) mm latis multo crassius marginatis diversa.

Species Description - Glabrous throughout, the foliage dull olivaceous, the stiffly chartaceous lfts paler beneath, all margined with a pallid cordlike nerve 0.25-0.4 mm diam; stipules 9-16 x 6-9 mm, a little shorter than the internodes, at apex obtusely deltate, persistent; lf-stalk stout 4.5-5.5 mm; gland 0.7-0.9 mm diam, obscurely stipitate, broader than tall; larger lfts ±20-24 x 6—8 mm; pedicels 25-30 mm; longer petals ±16 mm; ovules 12.—Collections: 1.

Distribution and Ecology - Cerrado, in sandy soils near 800 m, known only from the type-locality in the middle Rio São Francisco valley in n.-w. Bahia.—Fl. II-IV.

Discussion:

This striking variant on the theme of Ch. desvauxii resembles the glabrous state of var. mollissima in general aspect and in the broadly elliptic outline of the leaflets, but these differ in their stiff texture and in the pallid nerve that forms a blunt raised rim around the blade. Occasional leaflets of var. langsdorfii show a similar but less pronounced marginal thickening, but are then of substantially narrower outline.

Distribution:Bahia Brazil South America| Brazil South America|