Mimosa, Linnaeus, 1753

Silveira, Fernanda Schmidt, Bordignon, Sérgio A. L. & Sfoggia Miotto, Silvia T., 2016, A New Endemic Mimosa (Leguminosae, Mimosoideae) from Pampa Biome, Brazil, Phytotaxa 245 (3), pp. 197-206 : 200

Key to the species of Mimosa s ubseries Ramosissimae from Brazil

1. Stipules ovate, 3–6-nervate; branches with scabrous indumentum........................................................................ M. chaetosphaera

1’. Stipules linear-lanceolate, 1–2-nervate; branches with other type of indumentum.

2. Inflorescence capituliform.................................................................................................................................................................. 3

2’. Inflorescence elliptic .......................................................................................................................................................................... 5

3. Branches with trichomes stiff like aculei; calyx membranaceous; corolla glabrous;................................................. M. orthacantha

3.’ Branches without trichomes stiff like aculei; calyx subcoriaceous; corolla pubescent...................................................................... 4

4. Branches with hirsute and puberulent indumentum; calyx with defined lobes and each one 1-nervate; peduncles 7–13 mm length ................................................................................................................................................................................... M. ramosissima

4.’ Branches only with puberulent indumentum; calyx not lobate neither nervate; peduncles 3–6 mm length.................... M. terribilis

5. Delicate plants, little branched; hispid indumentum of branches; leaflets 1-nervate; corolla tubular or infundibuliform; calyx membranous-subtruncate, margin glabrous......................................................................................................... M. oblonga var. oblonga

5.’ Stiff plants, highly branched; hirsute indumentum of branches; leaflets 2-nervate; corolla campanulate or subtubular; calyx membranous-truncate, margin ciliolate ........................................................................................................... M. oblonga var. pinetorum