Oxandra reticulata Maas

Junikka, L., Maas, P. J. M., Maas-van de Kamer, H. & Westra, L. Y. Th., 2016, Revision of Oxandra (Annonaceae), Blumea 61 (3), pp. 215-266 : 248

18. Oxandra reticulata Maas — Map 9

Oxandra reticulata Maas in Maas et al. (1986) 261, f. 9, 10b, 11a–d. — Type: Schatz et al. 842 (holo U; iso F, K, MO,NY,US), Brazil, Maranhão, between Cachoerinha and Igarapé Pau Grosso, 57 km SSW of Barra do Corda, 3 Mar. 1983.

Shrub or tree 1–12 m tall, 5–10 cm diam; young twigs glabrous. Leaves: petiole 2–5 mm long, 0.5–1 mm diam; lamina elliptic to narrowly ovate, 3–10 by 1–5 cm (leaf index 1.7–2.8), coriaceous, not verruculose, often reddish brown-punctate below, shiny and brownish green to greyish green above, somewhat paler and sometimes glaucous below, glabrous above and below, base cordate to obtuse, apex bluntly acute to emarginate, primary vein slightly raised to flat above, secondary veins distinct, 7–12 on either side of primary vein, raised above, angle of secondary veins with primary vein 45–70°, smallest distance between loops and margin 1–3 mm, tertiary veins distinctly raised above and below, reticulate. Flowers solitary; pedicels 3–4 mm long, c. 0.5 mm diam, fruiting pedicels 5–7 mm long, c. 1 mm diam, sparsely covered with appressed hairs to glabrous; bracts 1–2, depressed ovate, c. 1 mm long, outer side densely to sparsely covered with appressed hairs; flower buds ellipsoid to globose; sepals broadly to shallowly ovate-

Map 9 Distribution of Oxandra reticulata (●) and O. unibracteata (●).

triangular, 1–3 by 1.5–3 mm, outer side sparsely covered with appressed hairs or glabrous; petals white to greenish yellow in vivo, elliptic or obovate to narrowly so, 5–8 by 2–3 mm, outer side glabrous; stamens c. 10, 2.5–3 mm long, apex of connective narrowly triangular; carpels ≤ 5. Monocarps 1–4, glaucous, green, maturing orange to red in vivo, black in sicco, broadly ellipsoid to ellipsoid, 13–28 by 8–17 mm, glabrous, apex apiculate (apiculum 0.1–0.5 mm long) or rounded, wall 0.2–1 mm thick, stipes 1–4 by 1–2 mm. Seed ellipsoid, 13–19 by 7–13 mm, pale brown, surface transversely striate, ruminations lamellate in 4 parts.

Distribution — Brazil (Bahia, Espírito Santo, Maranhão, Mato Grosso, Minas Gerais, Pará, Piauí, Tocantins).

Habitat & Ecology — In caatinga, campo rupestre, cerrado, cerradão, dry forest, on sandy or rocky soil. At elevations of 0–1100 m. Flowering: March, October, December; fruiting: January to April.

Vernacular names — Brazil: Atinha (Fróes 11578), Imbiú-mineiro (Da Luz 1).

Note — Oxandra reticulata , restricted to dry vegetation types of E and SE Brazil, is aberrant from all other species by very small leaves, distinctly reticulate on both sides. The primary vein and margins on the lower side of the lamina, moreover, are often densely covered with reddish to black dots .