Leandra triantha Camargo & Goldenberg (2011: 223)

Reginato, Marcelo, 2016, Taxonomic revision of Leandra sect. Leandra (Melastomataceae, Miconieae), Phytotaxa 262 (1), pp. 448-450 : 448-450

15. Leandra triantha Camargo & Goldenberg (2011: 223) . Type:— BRAZIL. Espírito Santo: Santa Tereza, Estação Biológica Santa Lúcia , 2 April 2004, L. Kollmann & M. Sobral 6588 (holotype MBML, isotype UPCB!). ( Figs. 70, 71 , 72 )

Shrubs, 1.5 m tall. Branches, petioles, leaves, inflorescences, bracts and bracteoles covered by appressed, unbranched trichomes (0.5–1 mm), these very sparse on the leaf surfaces, and denser on young branches, inflorescences and hypanthia; sometimes unbranched glandular trichomes mixed on the hypanthia (ca. 0.8 mm). Leaves isophyllous or slightly anisophyllous in each pair (up to 4:9 ratio); petioles 0.5–1.5 cm long; blades (3.5)5.5–10 × (1.5) 2–3 cm, lanceolate, apex acuminate, base acute or cuneate, margin entire or crenulate, ciliate (0.5 mm), subchartaceous; 3 acrodromous nerves, plus 1 additional pair of faint veins, basally nerved or plinerved,

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REGINATO distant 0–6 mm above the base, acrodromous nerves slightly prominent on adaxial surface and acrodromous nerves prominent, transversal flat on abaxial, reticulation slightly conspicuous. Inflorescences terminal, 1 per node, ca. 1

TAXONOMIC REVISION OF LEANDRA SECT. LEANDRA

Phytotaxa 262 (1) © 2016 Magnolia Press • 81 cm long, 0 pairs of opposite paraclades, accessory branches absent, 1–3 flowers per inflorescence, these in glomerules or solitary; bracteoles 3–5.5 × 1.5–2 mm, ovate or lanceolate, sparsely covered by unbranched trichomes, sometimes glabrous towards the margin with the trichomes restricted to the medium region, partially involucral, persistent. Flowers not seen. Berries purple to black, 6–10 × 5–8 mm. Seeds 0.7–0.9 × 0.45–0.55 mm, long-obpyramidal, hilum covering 9/10 of the seed length, anticlinal cell walls flat.

Notes:— Leandra triantha is known from a few localities in the Santa Teresa region of Espírito Santo. It is readily indentified by the terminal inflorescences consisting of a single glomerule with up to three flowers. Other species of sect. Leandra with reduced inflorescences (i.e., L. angustifolia , L. capitata , L. cogniauxii and L. loligomorpha ), clearly have their single glomerules in an axillary position. No collections bearing flowers at anthesis for this species are available. Therefore, its petal, stamen and style features could not be described. Leandra triantha is the only species of sect. Leandra with leaf domatia in the vein axils (likely acarodomatia for mites).

Specimens examined:— BRAZIL. Espírito Santo: Santa Leopoldina, Magnago 969 (MBML); Santa Teresa, Goldenberg 903 (NY), Goldenberg 1530 (NY), Reginato 1204 (NY).

Figures

FIGURE 71. Leandra triantha. A. Habit. B. Branch with frutescence. C–D. Frutescence.

FIGURE 72. Leandra triantha. A. Detail of the leaf on adaxial view. B. Branch with frutescence. C. Detail of the leaf base. D. Frutescence. E. Leaf on abaxial view. F. Detail of the shoot. Voucher: Goldenberg 1530.