Monographs Details: Chamaecrista sect. Grimaldia
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.
Discussion:

C.  Sectio GRIMALDIA (Schrank) Irwin & Barneby

Chamaecrista sect. Grimaldia (Schrank) Irwin & Barneby, comb. nov. Grimaldia Schrank, Bot. Zeit. (Regensb.) 4: 184. 1805, pro gen. = Cassia sect. Grimaldia (Schrank) Irwin & Barneby, Mem. N.Y. Bot. Gard. 30: 227. 1977.

Resembling sect. Absus subsect. Absus in glandular-setulose pubescence, and in particular the ser. Absoideae in the 4-foliolate lvs, but different as follows: phyllotaxy distichous; androecium 2-7-merous, not concealed by an involute heteromorphic petal, the longer filaments at least as long as their anther, this dehiscent before separation of the petals; style short and stout, grooved ventrally and passing upward into a spatuliform, distally enlarged and incurved, obliquely truncate stigma; between each pair of lfts a linguiform appendage, the distal one smaller, sometimes setiform.—Monocarpic herbs sometimes enduring into a second season and softly woody at base; fls small, 4.5-7 mm, at least facultatively cleistogamous.—Sp. 1, circumtropical, in the Americas 2 vars., the typical Ch. absus var. absus, with 5(-7)-androus fls and extending to Africa, s.-e. Asia and n. Australia, and the endemic var. meonandra, with (2-)3-4-androus fls.

A full description and synonymy has been presented in our monograph (Irwin & Barneby, 1977, i.e. sub Cassia). The transfer to Chamaecrista is here proposed:

1. Chamaecrista absus (Linnaeus) Irwin & Barneby, comb. nov. Cassia absus Linnaeus, Sp. Pl. 537. 1753 = Grimaldia absus (Linnaeus) Link, Handbuch 2: 141. 1831.

la. var. absus.

lb. var. meonandra (Irwin & Barneby) Irwin & Barneby, comb. nov. Cassia absus var. meonandra Irwin & Barneby, Mem. N.Y. Bot. Gard. 30: 282. 1977.