Leandra cogniauxii (D'El Rei Souza) Reginato, 2016

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

6. Leandra cogniauxii (D'El Rei Souza) Reginato , comb. nov. ( Figs. 32 , 33 , 34 , 35 )

Basionym: Ossaea cogniauxii Souza (2002: 31) . Type:— BRAZIL. Minas Gerais: Santa Bárbara, Serrinha de Santa Bárbara , 4

May 1892, A.F.M. Glaziou 19324 (holotype P, isotypes BR image!, C, K image!, P) .

Shrubs or treelets, 2–3 m tall. Branches, petioles, leaves, inflorescences, bracts and bracteoles covered by unbranched trichomes (3–8 mm), these sparser on leaf abaxial surfaces, and denser on young branches and petioles. Leaves isophyllous or slightly anisophyllous in each pair (8:10 ratio); petioles 1–2 cm long; blades 10–22 × 5–10 cm, elliptic to obovate, apex shortly acuminate, sometimes slightly caudate, base cuneate, margin entire or crenulate, ciliate (1.5–4 mm), chartaceous; 3 acrodromous nerves, plus 1 additional pair of faint veins, plinerved, distant 5–15 mm above the base, acrodromous nerves slightly printed on adaxial surface and acrodromous and transversal nerves prominent on abaxial, reticulation slightly conspicuous. Inflorescences axillary, 2 per node, 1 cm long, opposite paraclades absent, accessory branches absent, 3 flowers per inflorescence, these in glomerules; bracteoles 4.5–10 × 1.5–3 mm, oblong, uniformly covered by unbranched trichomes, involucral, persistent. Flowers 5-merous, sessile. Hypanthium 3–3.5 × 1.8–2 mm, tubular to slightly urceolate, torus indumentum absent. Calyx tube 0.5 mm long; inner lobes 1 × 0.5 mm, oblong with a rounded apex; external teeth 3–4 mm long. Petals with the borders white and central region pinkish, 4.8–5.2 × ca. 1.5 mm, linear to lanceolate, apex acute to acuminate, glabrous, spreading at anthesis. Stamens 10, surrounding the style; filaments geniculation absent or slightly conspicuous, the larger 3.5–4 mm long, the smaller 3.2– 2.6 mm long; anthers white, the larger 3.5–4 mm long, the smaller 3–3.5 mm long, linear-subulate, straight, pore 0.10–0.15 mm wide, connectives dorsally not produced below the anthers, appendage absent. Ovary 3-celled, ca. 2 × 1.5 mm, ca. 50 % inferior, apex covered by unbranched trichomes (0.8–1 mm). Style 12 mm long, straight, surrounded by the stamens, stigma 0.2 mm diam. Berries blue, 6 × 3 mm. Seeds ca. 0.8 ×. 6 mm, obpyramidal, hilum covering 8/10 of the seed length, anticlinal cell walls flat.

TAXONOMIC REVISION OF LEANDRA SECT. LEANDRA

Phytotaxa 262 (1) © 2016 Magnolia Press • 41

Notes:— Leandra cogniauxii can be distinguished by the long trichomes, obovate leaves and conspicuous bracteoles. All the recent collections are from the same locality, which is a neighboring municipality of the one indicated for the type specimen.

Specimens examined:— BRAZIL. Minas Gerais: São Gonçalo do Rio Abaixo, Lombardi 4684 (UPCB), Reginato 1419 (NY, UPCB), SPF 84983 (SPF), SPF 84985 (SPF).

Figures

FIGURE 32. Distribution of Leandra cogniauxii.

FIGURE 33. Leandra cogniauxii. A. Habit. B. Leaf base on abaxial view. C. Detail of the inflorescences. D. Flower.

FIGURE 34. Leandra cogniauxii. A. Branch with inflorescences. B. Inflorescence. C. Leaf on abaxial view. D. Detail of the shoot. E. Detail of the leaf base. F. Detail of the leaf on adaxial view. Voucher: Oliveira s.n. (SPF 84985).

FIGURE 35. Leandra cogniauxii. A. Flower. B. Hypanthium and calyx longitudinal section. C. Hypanthium. D. Bracteole. E. Hypanthium and ovary cross section. F. Anther apex. G. Style. H. Detail of the calyx. I. Stamen. J. Anthers. K. Petal. L. Detail of ovary apex. Scales: A–D, G, I–K = 1 mm; E–F, H, L = 0.25 mm. Voucher: Reginato 1419.