Melastomataceae in a continental Atlantic Forest island from southeastern Brazil Author Silva-Gonçalves, Kelly Cristina Da Programa de Pós-graduação em Ciências Ambientais e Florestais; Universidade Federal Rural do Rio de Janeiro; UFRRJ, Rodovia BR- 465, Km 7, 23.890 - 000, Seropédica, Rio de Janeiro, Brazil; E-mail: kellysilva 2010 @ yahoo. com. br & Author for correspondence Author Baumgratz, José Fernando A. Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, Rua Pacheco Leão 915, 22.460 - 030, Rio de Janeiro, Brazil; E-mail: jbaumgra @ jbrj. gov. br Author Nunes-Freitas, André Felippe Departamento de Ciências Ambientais e Florestais, Universidade Federal Rural do Rio de Janeiro; UFRRJ, Rodovia BR- 465, Km 7, 23.890 - 000, Seropédica, Rio de Janeiro, Brazil; E-mail: afnfreitas @ gmail. com text Phytotaxa 2014 2014-10-17 183 2 61 92 http://dx.doi.org/10.11646/phytotaxa.183.2.1 journal article 10.11646/phytotaxa.183.2.1 1179-3163 5149548 7.5. Tibouchina heteromalla ( Don 1823: 295 ) Cogniaux (1885: 336) . [ Figs. 3x , 10g –k ] Shrubs ca. 0.5 m ; indumentum of the branch, petioles and inflorescences hispidulous-sericeo. Branches tetragonal, not winged. Petioles 2.2–3.4 cm long; blade 10.1–15 × 4.7–8.9 cm , chartaceous or membranaceous, broadly ovate to elliptic, base obtuse-cordate, apex acute, margin entire; adaxial surface bullate, densely sericeo-setulose, the trichomes appressed, abaxial surface foveolate-reticulate, densely villous-sericeo; acrodromous basal veins 5, hispidulous-sericeo and sparsely villous at abaxial surface. Thyrsoids 17.7–24.6 cm long; bracts foliaceous not seen, caducous; bracts not foliaceous 7–8 × ca. 3 mm , thick, slightly concave, elliptic, early-caducous; bracteoles 3.5–4 × 1.4–1.5 mm , concave, elliptic, early-caducous. Pedicel 1.8–2 mm long; hypanthium 3–5 × 2.7–3 mm , tubulose, appressed-sericeo; calyx with lobes ca. 3 × 1.5–1.7 mm , caducous, triangular, margin ciliolate, appressed-sericeo in abaxial surface; petals 8–11 × 7.5–9 mm , purple; stamens with filaments basally glandular-pubescent, anthers lilac, falciform, connective bilobulate, antesepalous with filaments 5.8–6 mm long, anthers 5–6 mm long, connective 1–1.5 mm prolonged, appendage glandular, antepetalous with filaments ca. 4.5 mm long, anthers 4–4.2 mm long, connective 1–1.3 mm prolonged, appendage glabrous, sometimes with one gland; ovary 5–5.5 × 4–5 mm , sericeo; style 7–7.3 mm long, basally setulose. Ruptidium 10–11 × 3.5–4.9 mm ; seeds 0.6–0.7 × ca. 0.1 mm . Specimens examined :— 27.IX.2009 , ster., K.C. Silva 57 ( RBR ) ; 22.I.2010 , ster., K.C. Silva 70 ( RBR ) ; 19.III.2010 , fl., fr., K.C. Silva 79 ( RBR ) . Distribution :—Endemic to Brazil , occurring in the states of Goiás , Paraíba , Pernambuco , Minas Gerais , Espírito Santo , Rio de Janeiro , and São Paulo ( Guimarães 2012 ). FIGURE 10. Tibouchina gaudichaudiana : a. hypanthium and calyx; b–c. antisepalous and antipetalous stamens, respectively; d. bract; e. fruit; f. seeds (a, d. Silva 27 ; b–c. Souza 152 ; e–f. Silva 30 ). Tibouchina heteromalla : g. hypanthium and calyx; h. bract; i–j. antisepalous and antipetalous stamens, respectively; k. fruit (g, i–k. Silva 79 ; h. Nadruz 2119 ). Tibouchina trichopoda : l. floriferous branch; m–n. leaf: adaxial and abaxial surfaces, respectively; o. bract; p. bracteole; q. petal; r. calyx lobes; s–t. antisepalous and antipetalous stamens, respectively; u. fruit ( Silva 106 ). Comments :—This is the first record for Marambaia, where it is restricted to Dense Submontane Ombrophilous Forest. Tibouchina heteromalla is distinguished by the bullate adaxial surface that is densely sericeous-setulose, and the reticulate-foveolate abaxial surface that is densely sericeous-villous, with sericeous-hispidulous and sparse-villous acrodromous venation and glandular-pubescent filaments at the base. Additional illustrations in Cogniaux (1883 – 1888), Guimarães (1997) , and Baumgratz et al. (2006) .