Oxandra guianensis R.E.Fr.
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publication ID |
https://doi.org/10.3767/000651916X694283 |
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persistent identifier |
https://treatment.plazi.org/id/038A142D-6436-B255-2503-F9C3B78EFCB3 |
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treatment provided by |
Felipe |
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scientific name |
Oxandra guianensis R.E.Fr. |
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6. Oxandra guianensis R.E.Fr. View in CoL — Fig. 4b View Fig , 6 View Fig ; Map 3 View Map 3
Oxandra guianensis R.E.Fr. (1948) 229. — Type: Forest Department British Guiana (FDBG) 3124 = Fanshawe 388 (holo K; iso FDG, S), Guyana, Big Winiperu Creek, Demarara River, 4 Mar. 1940.
Tree 5–15 m tall, 4–12 cm diam; young twigs densely covered with appressed hairs, soon glabrous. Leaves: petiole 2– 5 mm long, c. 1 mm diam; lamina narrowly elliptic to narrowly obovate, 8–13 by 2.5–5 cm (leaf index 2.6–3.1), coriaceous, densely verruculose above and below, verruculae string-forming particularly below, brown to greyish brown above, brown below, glabrous above, margins and primary vein rather densely covered with appressed, white, hairs when young below, soon glabrous, base acute, with two distinct angular to tooth-like projections on either side, apex shortly acuminate (acumen to c. 5 mm long), primary vein impressed above, secondary veins indistinct and almost invisible, 7–9 on either side of primary vein, impressed above, angle of secondary veins with primary vein 70–75°, smallest distance between loops and margin 3–5 mm, tertiary veins indistinct and almost invisible, reticulate. Infructescence 1–3-flowered; fruiting pedicels 3–5 mm long, 1–2 mm diam, glabrous; bracts 5–7, depressed ovate, 1–2 mm long, outer side glabrous; flower buds not seen; sepals broadly ovate, 1.5–2 by 1.5–2 mm, outer side glabrous; petals, stamens and carpels not seen. Monocarps 3–8, bright to dull red in vivo, black in sicco, globose to ellipsoid, 7–11 by 5–8 mm, glabrous, apex rounded to apiculate (apiculum <1 mm long), wall c. 0.5 mm thick, stipes 3–7 by 1 mm. Seed ellipsoid, 7–8 by 5–6 mm, brown, surface transversely striate, ruminations spiniform.
Distribution — Guyana.
Habitat & Ecology — In non-inundated forest, in the Mabura Hill region with many species of Myrtaceae , on lateritic soil.At elevations of 0– 65 m. Flowering: unknown; fruiting: March, April.
Vernacular name — Guyana: Arara (Forest Department British Guiana 3124 = Fanshawe 388).
Note — Oxandra guianensis is restricted to Guyana. It is characterized by leaves which are densely verruculose on both sides and which have a very indistinct venation. Moreover, the leaf base has two distinct angular to tooth-like projections on either side. It is probably closest to O. xylopioides , differing by much smaller monocarps (7–11 mm vs 13–25 mm long).
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