Triumfetta decaglandulata (Grewioideae, Malvaceae), a new species from the Cerrado-Amazon ecotone, Northern Brazil Author Cardoso, Jesiane Miranda Universidade Federal Rural da Amazônia / Museu Paraense Emílio Goeldi. Programa de Pós-Graduação em Ciências Biológicas Author Fernandes-Júnior, Aluísio José Universidade Federal do Maranhão, Centro de Ciências de Grajaú, Av. Aurila Maria dos Santos Barros Sousa, 2010, Frei Alberto Beretta, 65940 - 000 - Grajaú, MA - Brasil. Author Gil, André Dos Santos Bragança Museu Paraense Emílio Goeldi, Campus de Pesquisa, Coordenação de Botânica - COBOT. Av. Perimetral 1901, Terra Firme, CEP 66077 - 830, Belém, PA, Brasil. text Phytotaxa 2022 2022-05-12 545 3 287 293 journal article 55564 10.11646/phytotaxa.545.3.4 5fec0b85-76ae-43f0-8036-ae7154ec10e9 1179-3163 6541543 Updated key to the species of Triumfetta from Brazil (adapted from Fernandes-Júnior et al. 2018 ). 1. Androgynophore with 10 glands ............................................................................................................................ T. decaglandulata - Androgynophore with 5 glands or absent..........................................................................................................................................2. 2. Inflorescence paniculiform; fruits with straight spines .......................................................................................... T. multiglandulosa - Inflorescence racemiform or cymes; fruits with uncinate spines ......................................................................................................3. 3. Sepals at anthesis 15–20 mm long; petals 14–19 mm long...............................................................................................................4. - Sepals at anthesis 3.5–11 mm long; petals 3–9 mm long..................................................................................................................5. 4. Fruits sparsely spinescent ................................................................................................................................................ T. longicoma - Fruits densely spinescent............................................................................................................................................... T. grandiflora 5. Leaves elliptic...................................................................................................................................................................... T. obscura - Leaves ovate, panduriform, and/or rhombiform................................................................................................................................6. 6. Flower without petals; androgynophore absent.................................................................................................................... T. lappula - Flowers with distinct petals; androgynophore present ......................................................................................................................7. 7. Sepals 3–3.5 mm long; stamens 5; androgynophore quadrangular, membranaceous urceolus absent ............................. T. sampaioi - Sepals 4–11 mm long; stamens 10–30; androgynophore ellipsoid to spherical, membranaceous urceolus present.........................8. 8. Sepals vinaceous, strongly cucullate, apical appendage ca. 0.5 mm long; androgynophore ca. 0.5 mm long; fruits cinereousvelutine ......................................................................................................................................................................... T. rhomboidea - Sepals greenish-yellow, not cucullate, apical appendage 1–3 mm long; androgynophore 0.75–1 mm long; fruits glabrous or yellowish-pubescent ..........................................................................................................................................................................9. 9. Stigma entire; fruits 4–5-loculate .................................................................................................................................. T. althaeoides - Stigma trifid; fruits 2–3-loculate .....................................................................................................................................................10. 10. Leaf blades covered only by stellate trichomes; petals elliptic; stamens 15–25 ............................................................ T. semitriloba - Leaf blades covered by stellate and simple trichomes; petals boradly obovate; stamens 25–35 .................................... T. bogotensis