Monographs Details: Cassia incurvata Benth. var. incurvata
Authors:Howard S. Irwin, Rupert C. Barneby
Authority: Irwin, Howard S. & Barneby, Rupert C. 1978. Monographic studies in Cassia (Leguminosae, Caesalpinioideae). III. Sections Absus and Grimaldia. Mem. New York Bot. Gard. 30: 1-300.
Family:Caesalpiniaceae
Synonyms:Cassia incurvata Benth.
Description:Distribution and Ecology - Campos, very local on red clay soil associated with residual sandstone caprock, 990-1050 m, headwaters of Rio Paranaiba in the Triangulo of Minas Gerais, from Monte Alegre de Minas e. to Catiara, n. along Rio Sao Marcos in adjoining Goias, and feebly n.-e. in Minas to the edge of the Rio Paracatu drainage at Joao Pinheiro. - Fl. IV—VIII (IX). "Habitat in Chapada S. Marcos, prov. Goyaz: Pohl."

Species Description - Lfts asymmetrically semi-ovate, 3-9 x 1.2-5 cm, obliquely deltate at extreme base, the posterior margin forming in relation to the petiole a cordate curve. Sepals 12-15 x 3.5-4.5 mm; petals to ± 14-16 mm. — Collections: 9. — Plate 16.

Discussion:

A cassia of strong idiosyncratic facies, resembling C. planifolia in habit and stature but different in the more freely branched stems and particularly in the strongly asymmetric leaflets deflected from the tip of a stiff, unwinged petiole in the attitude of a pair of half-closed angel wings as these are depicted in sentimental religious art. The four known collections may well represent only two major populations, these lying about 200 km apart. At Morro das Pedras in the Triangulo Mineiro, a lowly knoll rising out of the campo and crowned with a remnant, less than an acre in extent, of sandstone caprock, var. incurvata is locally abundant in the red clay soil immediately derived from weathered rock, and is rigidly confined to this narrow habitat. It is possible that Riedel's locality on Rio das Velhas is actually the same. There were mines in the vicinity of Morro das Pedras in early XIX century and a road leading northeastward from Uberaba to Paracatu passed nearby. The actual type-locality on Rio S. Marcos may well have been rediscovered in 1963 by W. Anderson (no. 8316) at a point on the highway 35 km east of Cristalina, a road traveled by Pohl on his journey in December 1818 between Paracatu and the Serra dos Cristais.

Distribution:Brazil South America| Minas Gerais Brazil South America| Goiás Brazil South America|

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