New taxonomic circumscription to Chamaecrista ser. Setosae (H. S. Irwin & Barneby) H. S. Irwin & Barneby (Leguminosae, Caesalpinioideae) Oliveira, Jaqueline Aparecida De Mendes, Thainara Policarpo Souza, Alessandro Oliveira De Silva, Marcos José Da Phytotaxa 2021 2021-03-12 490 2 118 158 H. S. Irwin & Barneby 1982 H. S. Irwin & Barneby 1978 [341,669,338,365] Magnoliopsida Fabaceae Chamaecrista Plantae Fabales 10 128 Tracheophyta series Setosae    1. Leaves with 1 pair of leaflets..............................................................................................................................................................2  - Leaves with 2 or 3 pairs of leaflets.....................................................................................................................................................3   2. Subshrub 0.12–1 mtall; Leaves with petiole 1–4 cmlong; leaflets oblanceolate or oboval-spatulate, surface adaxial scabroussetulose, base asymmetrically cuneate or attenuate; pedicel 1.7–3.6 cmlong; flowers with 4 petals oboval and 1 asymmetrically oboval .............................................................................................................................................................................8.   Ch. scabra  - Shrub 1.5–2.5 mtall; leaves sessile; leaflets rhombic, elliptical or asymmetric-oval, adaxial surface setulose, base conspicuously asymmetric; pedicel 1–1.4 cmlong; flowers with 5 petals similar oboval ............................................................1.  Ch. auriszerdae   3. Leaflets heteromorphic, one pair reniform and other suborbicular; petiole up to 3 mmlong ...................................... 5.  Ch. obtecta  - Leaflets isomorphic; petiole 1–9 cmlong ..........................................................................................................................................4   4. Leaflets carthaceous or papyraceous ..................................................................................................................................................5  - Leaflets coriaceous .............................................................................................................................................................................6   5. Leaflets elliptical with flat margin; tertiary veins non-prominent on the abaxial surface; anthers conspicuously mucronate; seeds oblongoid; plants from the states of Goiás, Distrito Federal, Mato Grosso, Mato Grosso do Sul, and Minas Gerais......................... ....................................................................................................................................................................................4.  Ch. multiseta  - Leaflets oblong, oblong-lanceolate or oval with margin revolute; tertiary veins prominent on the abaxial surface; anthers slightly mucronate; seeds pyriform; plants from Venezuelaand Amazon region of Brazil............................................... 7.  Ch. orenocensis   6. Subshrubs or shrubs, 1–5 mtall; leaves with 2 or 3 pairs of leaflets; flowers in panicle ..................................................................7  - Shrubs 0.3–0.8 mtall; leaves always with 2 pairs of leaflets; flowers in typical racemes.................................................................8   7. Leaflets with secondary veins perpendicular in relation to the main and anastomosed in a submarginal vein; inflorescence puberulent, never setose or setulose ...........................................................................................................................3.  Ch. coradinii  - Leaflets with secondary veins ascending in relation to the main and anastomosed before the margin; inflorescence setose- or setulose-viscous...............................................................................................................................................................9.  Ch. setosa   8. Plant decumbent and non-cespitose; leaflets and axes of inflorescence setose-stellate; flowers 3.4–4 cmlong; legume setose ........ ..................................................................................................................................................................................2.  Ch. campicola  - Plants erect and caespitose; leaflets glabrous; axes of inflorescence setose or setulose; flowers 1–2 cmlong; legume puberulent... ............................................................................................................................................................................. 6.  Ch. ochrosperma