Miconia dodecandra ( Desrousseaux 1797: 46 ) Cogniaux (1887: 243)

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 : 78

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https://doi.org/ 10.11646/phytotaxa.183.2.1



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Miconia dodecandra ( Desrousseaux 1797: 46 ) Cogniaux (1887: 243)


5.7. Miconia dodecandra ( Desrousseaux 1797: 46) Cogniaux (1887: 243) View in CoL . [ Figs. 3m View FIGURE 3 , 8a–f View FIGURE 8 ]

Trees 5–11 m; indumentum of the branches, leaves, inflorescences, abaxial surface of the bracts and bracteoles, hypanthium and calyx densely furfuraceous-stellulate and -dendritic, the trichomes caducous or not. Petioles 4.2– 7.6 cm long, striated; blade 16.5–22.2 × 6.3–9 cm, discolour, chartaceous, elliptic, base obtuse, apex acuminate, margin entire; adaxial surface dark green, glabrescent, abaxial surface rufous, completely covered by the indumentum, epidermic surface not exposed, the trichomes persistent; acrodromous basal to inconspicuously suprabasal veins 5. Thyrsoids 6.4–18 cm long, with no branchlets of scorpioid cymes; bracts 8–15 × 0.9–2 mm, bracteoles 5–6 × 1.5–2 mm, both involucral, elliptic, apex acute or acuminate, early-caducous. Flowers 5-merous, pedicelate; hypanthium 3.9–4 × 1.8–2.7 mm, campanulate; inner torus glabrous; calyx persistent, lobes 1.1–1.9 × 2.2–2.3 mm, triangular; petals 6–8.5 × 3–3.1 mm, white-rosy, oblong, apex obtuse to rounded; stamens isomorphic, subequal in size, yellow, becoming reddish to vinaceous after fertilization; filaments 6.5–7.8 mm long; anthers 6–7.5 × 0.6–1 mm, falciform, pore terminal, connective not prolonged, dorsally gibbous and callous, appendage latero-ventrally bilobed; ovary 2–3 × 1–1.9 mm, 1/2-inferior, 3-celled, setose at the apex; style 1.2–1.3 cm long, setose. Bacidium 5–7.5 × 4–5.8 mm, subglobose, sparsely furfuraceous-stellulate, polyspermous (70–100 seeds); seeds 0.4–1 × 0.5–1 mm, obtriangular, granulose.

Specimens examined:— 17.VIII.2002, fr., G.M. Siqueira & A.L. Melo 84 (RBR) ; 7.IV.2007, fl., K.C. Silva 7, 14 (RB, RBR) ; 7.IV.2007, fl., fr., K.C. Silva 9 (RB, RBR) ; 19.III.2010, fl., fr., K.C. Silva 75, 76 (RBR) .

Distribution:—This species has a wide distribution, occurring from Mexico to the south of Brazil, where it is found in the states of Amazonas, Bahia, Minas Gerais, Espírito Santo, Rio de Janeiro, São Paulo, Paraná, and in the Distrito Federal (Goldenberg 2012).

Comments:—In Marambaia, this species is restricted to Dense Submontane Ombrophilous Forest. It has discolour leaves with a dark green adaxial surface and a rufous abaxial surface, early caducous involucral bracts and bracteoles, and a dorsally gibbouos and callous connective with two latero-ventral lobes. Additional illustrations in Baumgratz (1982).

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