Tibouchina corymbosa ( Raddi 1829: 124 ) Cogniaux (1885: 363)

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 : 81-82

7.1. Tibouchina corymbosa ( Raddi 1829: 124) Cogniaux (1885: 363) . [ Figs. 3r , 9d–j ]

Treelets 2–4 m; indumentum of the branches, leaves, inflorescences, abaxial surface of the bracts, bracteoles and lobes of the calyx appressed-strigose or -estrigulose. Branches flattened to terete, not winged. Petioles 1.2–3 cm long, strigulose; blade 2.7–8.5 × 0.9–3.7 cm, membranaceous, elliptic, base subcordate, apex acuminate, margin entire, slightly undulate, ciliolate; adaxial surface with trichomes basally not thickened nor branched; acrodromous veins 5, the inner basal, the marginal suprabasal and diverging from the inner. Thyrsoids or double dichasia 5.6–6.6 cm long; bracts foliaceous not seen, caducous; bracts not foliaceous 10–11 × 1–1.1 mm, thick, narrowly triangular, adaxial surface glabrous, persistent; bracteoles 6.2–7.8 × 1.5–2 mm, oblong, concave, adaxial surface glabrous, caducous. Pedicel 4.2–9.5 mm; hypanthium 6–7 × 4.1–4.3 mm, tubulose, glandular-strigulose, glandular head caducous; calyx glandular-strigulose, glandular head caducous, lobes 4–4.2 × 1.5–2.2 mm, caducous, triangular, margin ciliolate; petals 18–22 × 10–12 mm, purple, apex truncate; stamens with filaments basally glandular, anthers lilac, slightly falciform, appendage bilobed, antesepalous with filaments 11–12 mm long, anthers 11–12 mm long, connective 1.8–2 mm prolonged, antepetalous with filaments 7.8–8 mm long, anthers 8.8–9 mm long, connective 0.5–0.9 mm prolonged; ovary 4–5.5 × 2.5–3 mm, densely setose at the apex; style 18–23 mm long, glabrous. Velatidium 7–9.5 × 4–7 mm; seeds 0.3–0.5 × 0.05–0.1 mm.

Specimens examined:— 27.IX.2009, ster., K.C. Silva 56 (RBR) ; 19.III.2010, fr., K.C. Silva 80 (RBR) .

Additional specimen examined:— BRASIL. Rio de Janeiro: Itaipuaçu , 14.I.1982, fl., fr., R.H.P. Andreata et al. 377 (RB) .

Distribution:—Endemic to the state of Rio de Janeiro in the Atlantic Forest Biome ( Guimarães 2012). Comments:—This is the first record for Marambaia, where T. corymbosa is restricted to Dense Submontane

Ombrophilous Forest. It can be distinguished by its basally subcordate leaves and the basal glandular filaments.

Additional illustrations in Guimarães (1997).

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 9. Ossaea marginata: a. floriferous branch; b. young fruit; c. seed (a. Silva 18; b–c. Silva 28). Tibouchina corymbosa: d. floriferous branch; e–f. leaf: abaxial and adaxial surfaces, respectively; g. calyx lobes; h. bract; i. fruit; j. seed (d. Guimarães 327; e–g., i–j. Silva 80; h. Cardoso 32). Tibouchina estrellensis: k–l. leaf: adaxial and abaxial surfaces, respectively; m. calyx; n. fruit (Conde 459). Tibouchina granulosa: o. stem node; p–q. leaf: adaxial and abaxial surfaces, respectively; r. tetragonal and winged branch; s. calyx; t. bract: adaxial surface; u. fruit; v. seed (Silva 10).