Chamaecrista exsudans (Benth.) H.S. Irwin & Barneby, Mem.

Oliveira, Jaqueline Aparecida De, Mendes, Thainara Policarpo, Souza, Alessandro Oliveira De & Silva, Marcos José Da, 2021, New taxonomic circumscription to Chamaecrista ser. Setosae (H. S. Irwin & Barneby) H. S. Irwin & Barneby (Leguminosae, Caesalpinioideae), Phytotaxa 490 (2), pp. 118-158 : 152-156

Chamaecrista exsudans (Benth.) H.S. Irwin & Barneby, Mem. New York Bot. Gard. 35: 650. 1982. Cassia exsudans

Benth., J. Bot. (Hooker) 2(4): 80. 1840. Type:— BRAZIL: Minas Gerais: Ouro Preto, Cachoeira (“Caxoeira”) do

Campo, 1839, (fl), Claussen 25 (lectotype: K-00055549, designated by Bentham in Martius (1870), isolectotype: P-

00836007).

= Chamaecrista xanthadena (Mart. ex Benth.) H.S. Irwin & Barneby, Mem. New York Bot. Gard. 35: 650. 1982. Cassia exsudans var. xanthadena Mart. ex Benth. in Mart., Fl. Bras. 15: 152. 1870. Cassia xanthadena (Mart. ex Benth.) H.S. Irwin & Barneby, Mem. New York Bot. Gard. 30: 58. 1978. Type:— BRAZIL: Minas Gerais: “Inter distr. Adamant. et Sa. de S. Antonio, in vepretis siccis deserti”, August 1818, (fl), Martius 1508 (holotype: M-0217529, M-0217530).

= Chamaecrista adamantina (H.S. Irwin & Barneby) H.S. Irwin & Barneby, Mem. New York Bot. Gard. 35: 650. 1982. Cassia adamantina H.S. Irwin & Barneby, Mem. New York Bot. Gard. 30: 57. 1978. Type:— BRAZIL: Minas Gerais: Diamantina , June 1934, (fl, fr), Brade 13677 (holotype: RB-00539426, RB-00545310, isotype: NY-00003703).

= Chamaecrista ixodes (H.S. Irwin & Barneby) H.S. Irwin & Barneby, Mem. New York Bot. Gard. 35: 650. 1982. Cassia ixodes H.S. Irwin & Barneby, Mem. New York Bot. Gard. 30: 59. 1978. Type:— BRAZIL: Minas Gerais: Itamarandiba, Chapada de Itamarandiba , June 1960, (fl, fr), Mendes-Magalhães 18053 (holotype: NY-00003821).

= Chamaecrista xanthadena (Mart. ex Benth.) Govaerts, World Checkl. Seed Pl. 3: 14. 1999. Nom. illeg.

= Chamaecrista amphibola (H. S. Irwin & Barneby) Irwin & Barneby (1982: 651) . ≡ Cassia amphibola Irwin & Barneby (1978: 72) , Type:— BRAZIL. São Paulo: in campis, Vila Franca [ca. 47°W, 2 r s], June 1834, (fl.), Riedel s.n. [holotype: Sheet 1 (LE00002283!), Sheet 2 (LE00002284!), isotype: NY00003710!]. Syn. nov.

Chamaecrista amphibola , included formerly in Ch. sect. Absus subsect. Absus ser. Setosae , is known only from its typus collection. It was described by Irwin & Barneby (1978) who cited that its could be an intermediate specimen (hybrid) between some taxa belonging to the series Setosae and Ursinae . After its description, Ch. amphibola was never collected again and analyzing the morphology of its typus collection, we concluded that it is more similar to Ch. exsudans from the series Ursinae than other species of Setosae, mainly for having 3 or more pairs of leaflets and abundant stellate trichomes in vegetative and reproductive parts, which led us to consider Ch. amphibola as a synonym for Ch. exsudans . Considering that both species were described in the same work, and that Ch. exsudans is a more collected and known taxon than C. amphibola , we opted for the binomial as valid.