Miconia petroniana Cogn. & Saldanha

  • Family

    Melastomataceae (Magnoliophyta)

  • Scientific Name

    Miconia petroniana Cogn. & Saldanha

  • Primary Citation

    Fl. Bras. (Martius) 14(4): 612. 1888

  • Type Specimens

    Specimen 1: Isosyntype 16011

  • Description

    Description Author and Date: Description by Mayara K. Caddah, 2013.

    Type: Type: Brazil. Rio de Janeiro: Nova Friburgo. Glaziou 16011 (syntypes: BR, C, G-2 sheets, K, NY, P, R).

    Description: Trees up to 4.5 m tall; young branches slightly flattened, with interpetiolar ridges, densely covered by ferruginous, stiff, sessile-stellate to dendritic trichomes of very short arms, ca. 0.2-1.5 x 0.2 mm. Leaves discolorous; petioles 3 cm; blades 14 x 7 cm, ovate-elliptic, apex acuminate, base rounded, margin entire, chartacecous, longitudinal nerves 5, with an additional, marginal pair, basal, abaxial surface densely covered by a canescent indument consisting of sessile-stellate trichomes, ca. 0.2 mm diam., and moderately by a ferruginous indument consisting of dendritic trichomes, ca. 0.4 mm diam. Panicles 14 x 10 cm, glomerulate, usually the glomerules so close to each other that looks like a spiguete, terminal, densely covered by a indument similar to the ones on the young branches; bracts and bracteoles lanceolate, up to 1.2 mm long, caducous. Flowers 4 (5)-merous. Hypanthium 1-1.1 mm long, campanulate, inner and outer surfaces glabrous; torus glabrous. Calyx lobate, caducous in fruit, outer surface densely covered by sessile-stellate trichomes, ca. 0.3 mm diam.; tube 0.2-0.3 mm long, densely covered by sessile-stellate trichomes, inner lobes 0.3 mm long, triangular, outer teeth subulate. Petals 1.6-1.9 x 0.8-0.9 mm. Stamens isomorphic; filaments 1.2-2.4 mm long, glabrous; connectives 0.4-0.6 prolonged below the thecae, unappendaged or with two small, ventral, lobes; anthers 1.2¬-1.3 mm long, oblong, with a single terminal, ventrally displaced, moderate pore, ca. 0.3 mm diam. Ovary 1 mm long, 1/3 adherent to the hypanthium, 2-3-locular, apex glabrous; style 2 mm long, straight, punctiform, glabrous. Mature fruits not seen.

    Habitat and Distribution: Miconia petroniana is only known from the mountain of Serra da Mar in Rio de Janeiro state, from 1000 to 1300m asl.

  • Sorry, no descriptions available for this record.