Cassia setosa var. subsetosa

Title

Cassia setosa var. subsetosa

Authors

Howard S. Irwin, Rupert C. Barneby

Scientific Name

Cassia setosa var. subsetosa (Malme) H.S.Irwin & Barneby

Description

38d. Cassia setosa Voegl var. subsetosa (Malme), stat. nov. C. subsetosa Malme in Ark. f. Bot. 23A, 13: 62. 1930. - "Santa Anna da Chapada, in 'cerrado' arenoso, 13.31.V. 1903 (II: 3321 et 3321a). . " - Lectotypus, Malme 3321, 13.V.03 (fl, fr),S! = NY Neg 6744; isotypus, S! paratypus, Malme 3321a, 31.V.03 (fl), R, S!

Resembling thin- and broad-leaved states of var. detonsa in habit and in the abruptly divaricate panicle-branches, but distinguished by the pubescence: stems, petioles, and raceme- axes hispid-setose but only minutely puberulent between the glabrous or almost glabrous setae; lfts above glabrous except for sparse setules, beneath minutely puberulent along the nerves or glabrous, the hairs all reduced to pallid papilliform bases. — Collections: 3.

Cerrado, on sandy soils, known only from the type-locality ± 30 km n.-e. of Cuiaba in centr. Mato Grosso. — Fl. V—VI.

Malme compared C. subsetosa with typical C. setosa, from which it is easily distinguished by the broader leaflets only minutely puberulent or merely densely papillate beneath. Its close relationship is obviously with the then unknown forms of var. detonsa which occur on the Planalto of Mato Grosso immediately to the north and east. These, already mentioned under var. detonsa, are almost indistinguishable in habit, but differ in the absence of long hispid setae and the presence of longer and denser viscid-villosulous vesture which extends thinly to the upper leaf-surface.