Tibouchina heteromalla ( Don 1823: 295 ) Cogniaux (1885: 336)

Silva-Gonçalves, Kelly Cristina Da, Baumgratz, José Fernando A. & Nunes-Freitas, André Felippe, 2014, Melastomataceae in a continental Atlantic Forest island from southeastern Brazil, Phytotaxa 183 (2), pp. 61-92 : 84-86

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).

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).

Figures

FIGURE 3. Clidemia hirta (L.) D.Don: a. flower and fruit. Clidemia urceolata: b. flower. Huberia ovalifolia: c. flower; d. fruits. Leandra reversa: e. inflorescence. Marcetia taxifolia: f. flowers. Miconia albicans: g. fruits and floral buds. Miconia calvescens: h. flowers. Miconia chartacea: i. leaves. Miconia cinnamomifolia: j. branches with interpetiolar pseudo-stipules; k. fruits. Miconia cubatanensis: l. inflorescence. Miconia dodecandra: m. fruits. Miconia prasina: n. inflorescence. Miconia pusilliflora: o. inflorescence. Ossaea marginata: p. flowers; q. fruit. Tibouchina corymbosa: r. fruits. Tibouchina estrellensis: s. flower. Tibouchina gaudichaudiana: t. flower; u. fruit. Tibouchina granulosa: v. flower. Tibouchina heteromalla: x. flower. Tibouchina trichopoda: z. flower.

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).