A synopsis of the genus Crotalaria (Leguminosae) in Brazil Flores, Andréia Silva Tozzi, Ana Maria Goulart De Azevedo Phytotaxa 2018 2018-03-29 346 1 31 58   36.  Crotalaria tweediana Bentham (1843:482). ( Fig. 8d).   Type:— BRAZIL. Rio Grande do Sul: “Ad Porto Alegre, J. Tweedie 330( holotype: K 000500554 digital image!). Herb or subshrub up to 0.5 mhigh; branches densely pilose, ribbed; internodal stem wings absent. Leaves simple, blades elliptic- lanceolate, obovate or oblong- elliptic, 1.5 –5 × 0.5–2.5 cm, pilose or pubescent above and beneath; stipules absent or rare present at the base of the branches, 1–2cmlong, filiform. Inflorescence a raceme, 8–25 cmlong, terminal or subterminal; peduncles 4.5–12 cmlong. Flowers 6–20, pedicels 4–10 mmlong; bracts 4–10 × 1–2 mm, linear or linear- lanceolate, persistent; bracteoles 3–7 × 1–2 mm, linear or linear- lanceolate, persistent; calyx 10–20 mmlong, deeply divided into 2 lips, pilose; corolla yellow; the standard petal 1.2–1.7 × 1–2 cm; wing petals 1–1.5 cmlong; keel petals 1.2–1.7 cmlong, twisted; ovary 5–6 mmlong, sessile; style geniculate. Legumes 3–4.5 × 0.8–1.2 cm, oblong- clavate or obovate, glabrous, black at the maturity, ca 25-seeded; seeds 3 × 3 mm, seed coat brown.   Distribution and Ecology:—In Brazil,  Crotalaria tweedianais found in rocky soils and on mountain tops. It is restricted to Southern Brazil, its distribution extending southward into Argentina, Paraguayand Uruguay( Izaguirre 1999).  Selected specimens studied:— BRAZIL. Paraná: Palmeiras, February 1955, Frank s.nº(PACA 56902). Rio Grande do Sul: Caçapava do Sul, 28 November 1998, Flores 256(ICN). Santa Catarina: São Joaquim, Passo das Contas, 29 January 1950, Reitz 4990b(PACA).