Miconia lourteigiana Wurdack (1970: 380)

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 : 119-120

28. Miconia lourteigiana Wurdack (1970: 380) . ( Figure 2 Q ; 3 S .)

Trees ca. 12 m tall. Dark brown rhytidome. Branches erect, cylindrical, not winged, whitish; branches, petioles, leaves abaxial surface, inflorescences, bracts, bracteoles, hypanthium and fruits with arachnoid persistent trichomes. Leaves opposite, isophyllous; petioles striate 1.5–1.7 mm long; leaf blades 13.4–15.9 × 4.6–5.6 cm, chartaceous, discolored, symmetrical, elliptical, base cuneate or rounded, apex acute, margins entire and ciliate, adaxial side glabrous, leaf veins 5, basal; ant domatia absent. Paniculate scorpioid ca. 6.3 × 5.8 cm ,, terminal; bracts ca. 2.7 mm long, lanceolate, persistent; bracteoles ca. 0.5 mm long. Flowers 5-merous, sessile; hypanthium ca. 1.2 mm long, campanulate, smooth; calyx simple, persistent; lacinia triangular; petals ca. 1.8 × 1.2 mm, white, obovate, symmetrical, apex rounded, base truncate, margins not ciliate, glabrous; stamens 10, heteromorphic, smaller anthers ca. 1.6 mm, larger anthers ca. 2.3 mm long, white, oblong, straight, apex attenuate, anthers with a cordiform appendage at the base, with 1 ventral pore, connective not prolonged, smaller filaments ca. 1.4 mm, larger filaments ca. 2.1 mm long; ovary ca. 1.2 mm long, half-inferior, placentation axillary, 3-locular, glabrous; style ca. 3.2 mm long, straight, glabrous. Berry ca. 2.4 × 2.5 mm, unripe fruit green, ripe fruit blackish; fruits with up to 13 seeds, triangular.

Specimen examined:— BRAZIL. Amazonas, Manaus, RDS-Tupé, 24 October 2012, fr., A.L. Corrêa 77 (EAFM!, HUAM!, INPA!).

Additional specimen examined:— BRAZIL. Pará, Santarém, 19 February 1979, fl., M.R. Santos 566 (INPA!).

Distribution and habitat:— Colombia, Venezuela, Ecuador, Peru, Bolivia ( Goldenberg et al. 2013). In Brazil it occurs in Amazonian forests ( Goldenberg & Caddah 2015). In the reserve, it occurs in “terra firme” plateaus, on well drained, clay soil with a lot of organic matter.

Comments:— This species is not infrequent in the reserve. It can be distinguished by the dark brown rhytidome with detaching vertical plates, cylindrical branches and leaves with arachnoid trichomes and entire or serrate-ciliate margins.

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).