Ossaea marginata ( Desrousseaux 1797: 32 ) Triana (1871: 147)

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

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



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Ossaea marginata ( Desrousseaux 1797: 32 ) Triana (1871: 147)


6.1. Ossaea marginata ( Desrousseaux 1797: 32) Triana (1871: 147) . [ Figs. 3p–q View FIGURE 3 , 9a–c View FIGURE 9 ]

Shrubs 1.3–1.7 m; indumentum of the branches, petioles, inflorescences, hypanthium and calyx furfuraceous-stellulate and setose. Petioles 1.6–4.4 cm long; blade 10.6–19 × 3.2–5.9 cm, papiraceous, elliptic, base obtuse, apex acuminate, margin entire or crenulate, appressed-ciliolate; adaxial surface densely appressed-setulose in the marginal region, abaxial surface also furfuraceous-stellulate; acrodromous veins 5, the inner pair 5–15 mm suprabasal. Botryoid and metabotryoid 0.9–16 mm long, axillary, in leafy and/or aphyllous nodes; bracts 0.8–1 × 0.1–0.2 mm, bracteoles 0.8– 0.9 × 0.1–0.2 mm, both persistent, triangular, apex acuminate. Floral buds with apex acute to acuminate. Flowers 5-merous, pedicelate; hypanthium ca. 3 × 2.1–3 mm, campanulate; inner torus setulose, glabrescent; calyx persistent, bilobed, external lobes 3.5–5 × 0.5–1 mm, narrowly triangular, margin densely ciliolate, internal lobes 0.7–0.8 × 1.8–2 mm, short-triangular to ovate; petals 3–3.2 × 1–1.1 mm, white, narrowly triangular, apex acute to acuminate; stamens equal in size and shape, filaments ca. 2 mm long; anthers ca. 2 mm long, yellow, straight, pore terminal, connective not prolonged bellow the thecae, appendage dorsal, obsolete; ovary ca. 1 × 1–2 mm, 3/4- inferior, 4- celled, sparsely setulose; style ca. 6 mm long, glabrous. Baccate, bacidium type, 5.5–8 × 4.5–7 mm, purple-blackness, sparsely furfuraceous-stellulate and setose, polyspermous; seeds 0.8–1 × 0.1–0.3 mm, obtriangular.

Specimens examined:— 23.XII.2005, fl., fr., F.C. Nettesheim 162 (RBR) ; 12–13.X.2007, fl., fr., K.C. Silva 18 (RB, RBR) ; 12–13.X.2007, fr., K.C. Silva 19 (RB, RBR) ; 23.II.2008, fr., K.C. Silva 28 (RB, RBR) ; 9.I.2010, fr., K.C. Silva 62 (RBR) .

Distribution:—It occurs in Brazil, Argentina and Paraguay. In Brazil, it is found in the states of Mato Grosso do Sul, Minas Gerais, Espírito Santo, Rio de Jnaeiro, São Paulo, Paraná, and Santa Catarina, in Cerrado and Atlantic Forest Biomes ( Souza & Baumgratz 2012b).

Comments:—In Marambaia, this species occurs in Dense Sobmontane Ombrophuilous Forest. It can be distinguished by the axillary inflorescences at leafy and/or aphyllous nodes, the floral buds and petals with acute to acuminate apices, bilobed laciniate calyx, and the partly inferior ovary. Additional illustrations in Goldenberg et al. (2005), and Souza (2009).