Miconia umbrosa Cogniaux (1887: 315)

Corrêa, André Luis, Scudeller, Veridiana Vizoni & Goldenberg, Renato, 2017, Melastomataceae in the Reserva de Desenvolvimento Sustentável do Tupé, Amazonas, Brazil, Phytotaxa 323 (2), pp. 101-127 : 123-124

37. Miconia umbrosa Cogniaux (1887: 315) . ( Figure 2 V ; 3 I, k .)

Treelet 3.10–4.20 m tall. Slightly scaly rhytidome. Branches erect, cylindrical, not winged, grayish; branches, petioles, leaves abaxial surface, inflorescence, hypanthium and fruits with dendritic caducous trichomes. Leaves opposite, isophyllous; petioles striate 8.5–10.8 mm long; leaf blades 14.8–23.7 × 7.1–9.1 cm, chartaceous, discolored, symmetrical, oblong or oblong-elliptic, base attenuate, apex acuminate, margins entire not ciliate, adaxial side glabrous, leaf veins 5, suprabasal; ant domatia absent. Paniculate 9.6–14.6 × 4.6–12.8 cm ,, terminal; bracts not seen; bracteoles not seen. Flowers 5-merous; pedicel 0.3–1.6 mm long; hypanthium ca. 1.6 mm long, campanulate, smooth; calyx simple, caducous; petals 2.1– 0.9 mm, white, obovate, symmetrical, apex rounded, base attenuate, margins not ciliate, glabrous; stamens 12, isomorphic, anthers 2.1–2.3 mm long, white, oblong, straight, apex truncate,1 apical pore, connective not prolonged, filament 2.3–2.6 mm long; ovary 1.1–1.4 mm long, half-inferior, placentation axillary, 3- locular, with glandular trichomes; style 5.6–5.8 mm long, straight, glabrous. Berry 3.2–4.8 × 4.8–6.4 mm, unripe fruit green, ripe fruit blackish; seeds numerous, triangular.

Specimens examined:— BRAZIL. Amazonas , Manaus, RDS-Tupé, 25 October 2012, fl., A. L. Corrêa 81 ( EAFM!, HUAM!, INPA!) ; 25 October 2012, fl., fr., A. L. Corrêa 85 ( EAFM!, HUAM!, INPA!) ; 07 December 2012, fr., A. L. Corrêa 129 ( EAFM!, HUAM!, INPA!) .

Distribution and habitat:— This species is endemic to Brazil ( Goldenberg et al. 2013), in Amazonian forests ( Goldenberg & Caddah 2015). In the reserve, it occurs on “terra firme” slopes, on sandy soil with low organic matter. Comments:— This species is frequent in the reserve. It has dark gray, slightly scaly rhytidome and leaves with very small reticulation.

Figures

FIGURE 2. Flower, fruit and bark in species of Melastomataceae in the RDS-Tupé: Flower (A–B).A: Henriettea martiusii; B: Tibouchina fothergillae. Fruit (C–F); C. H. maroniensis; D. Clidemia epibaterium; E. Miconia comptifolia; F. C. capitellata; G. Bellucia spruceana; H. M. longispicata, detail of inflorescence; I. M. rhytidophylla. Patterns and colors of the rhytidome and inner bark; J. M. chrysophylla; K. M. comptifolia; L. M. crassinervia; M. M. dispar; N. M. egensis; O. M. gratissima; P. M. longispicata; Q. M. lourteigiana; R. M. phanerostila; S. M. radulifolia; T. M. regelii; U. M. tomentosa; V. M. umbrosa; W. Tococa coronata; X. Tococa subciliata.

FIGURE 3. Morphological details of Melastomataceae species in RDS-Tupé: A. Adelobotrys marginata, leaf blade (from Corrêa 278); B. Miconia comptifolia, leaf blade with detail of the margins (from Corrêa 219); C. Tococa subciliata, leaf blade with detail of the margins (from Corrêa 112); D. Clidemia epibaterium, leaf blade with of the detail margins (from Corrêa 215); E. C. heteroneura, leaf base (from Corrêa 140); F. C. japurensis, leaf base (from Corrêa 21); G. Henriettea maroniensis, leaf blade and detail of trichomes on the abaxial surface (from Corrêa 139); H. M. poeppigii, leaf blade and detail of trichomes on the abaxial surface (from Corrêa 280); I. M. umbrosa, leaf base and detail of trichomes on the abaxial surface (from Corrêa 81); J. Tibouchina fothergillae, longitudinal section of the ovary, hypathium and calix (from Corrêa 218); K. M. umbrosa, detail of the ovary and style (from Corrêa 81); L. M. gratissima, transverse section of the ovary (from Corrêa 137); M. Aciotis circaeifolia, petal (from Corrêa,21);N. C. epibaterium, petal (from Ribeiro 932); O. Miconia tomentosa, stamen larger (from Corrêa 47); P. Aciotis acuminifolia, fruit (From Corrêa 102); Q. M. rubiginosa, fruit (from Scudeller 1067); R. Miconia phanerostila, seed (from Herb 96); S. M. lourteigiana, arachnoid trichome (from Corrêa 77I); T. M. crassinervia, dendritic trichome (from Corrêa 248) U. M. poeppigii, stellate trichome (from Corrêa 280); V. Adelobotrys marginata, malpighiaceous tricome (from Corrêa 278).