Oxandra surinamensis Jans.-Jac.

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 : 257

24. Oxandra surinamensis Jans.-Jac. — Plate 2f–h; Map 11

Oxandra surinamensis Jans.-Jac. (1970) 338, pl. 2. — Type: Florschütz & Maas 2419 (holo U; iso BM), Suriname, 1–2 km S of Kabalebo airstrip, 17 Dec. 1964.

Shrub or tree 0.5–3 m tall, diam not recorded; young twigs rather densely covered with erect and appressed, long-persisting hairs. Leaves: petiole 1–2 mm long, c. 1 mm diam; lamina narrowly elliptic to narrowly obovate, 8–13 by 3–5 cm (leaf index 2.6–3), chartaceous, not verruculose, dull and brownish green above and below, glabrous above, sparsely covered with appressed hairs along primary vein below, base obtuse, slightly oblique, apex acuminate (acumen 5–15 mm long), primary vein raised above, secondary veins distinct, 7–12 on either side of primary vein, slightly raised above, angle of secondary veins with primary vein 65–80°, smallest distance between loops and margin 2–3 mm, tertiary veins raised above, reticulate. Flowers solitary; pedicels c. 1–2 mm long, c. 1 mm diam, fruiting pedicels to c. 3 mm long, 1–1.5 mm diam, sparsely covered with appressed hairs; bracts 2–4, depressed ovate, 0.5–1 mm long, outer side sparsely covered with appressed hairs; flower buds globose to ellipsoid-oblong; sepals broadly to shallowly ovate-triangular, c. 1 by 1–2 mm, outer side rather densely to sparsely covered with appressed hairs; petals white in vivo, narrowly elliptic, 5–7 by 2–3 mm, outer side sparsely covered with appressed hairs to glabrous; stamens c. 10, c. 1.5 mm long, apex of connective depressed ovate; carpels ≤ 6. Monocarps 1–6, green, maturing yellow with reddish blush to black in vivo, brown in sicco, globose to ellipsoid, 8–10 by 5–8 mm, glabrous, apex rounded to apiculate (apiculum <0.5 mm long), wall c. 0.2 mm thick, stipes c. 1 by 1 mm. Seed ellipsoid-oblongoid, c. 8 by 6 mm, pale brown, surface transversely striate, ruminations spiniform.

Distribution — Suriname.

Habitat & Ecology — In forest on banks of river or ridgetops. At elevations of 0– 700 m. Flowering:August; fruiting: February, March, August, December.

Note — Oxandra surinamensis , restricted to Suriname, resembles another Guianan species, namely O. asbeckii , but differs by non-verruculose leaves, loops which are closer to the leaf margins (2–3 vs 3–5 mm) and smaller monocarps (8–10 vs 15–30 mm long).