Oxandra sessiliflora R.E.Fr.

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 : 253

publication ID

https://doi.org/10.3767/000651916X694283

persistent identifier

https://treatment.plazi.org/id/038A142D-641E-B27D-2503-FEF8B762FD1E

treatment provided by

Felipe

scientific name

Oxandra sessiliflora R.E.Fr.
status

 

22. Oxandra sessiliflora R.E.Fr. View in CoL — Fig. 21c, d, 22; Map 11

Oxandra sessiliflora R.E.Fr. (1931) 172, f. 5f, g. — Type: Ducke RB 18347 (holo S), Brazil, Pará, Rio Tocantins, near Campina de Arumaténa , 3 Jan. 1915.

Tree or shrub 1–25 m tall, 8–20 cm diam; young twigs rather densely covered with appressed hairs, soon glabrous. Leaves: petiole 2–3 mm long, 0.5–1 mm diam; lamina narrowly ovate to narrowly obovate, 3–7.5 by 1–2.5 cm (leaf index 2.4–3.4), coriaceous, not verruculose, smooth, shiny and dark brown to brownish green above, brown to brownish green below, glabrous above, rather densely to sparsely covered with appressed hairs 1– 2 mm long below, base obtuse to slightly cordate, apex bluntly acute, sometimes slightly emarginate, primary vein flat to slightly impressed above, secondary veins distinct, 8–12 on either side of primary vein, raised above, angle of secondary veins with primary vein 45–65°, smallest distance between loops and margin 1–2 mm, tertiary veins raised above, reticulate. Flowers in 1–2-flowered inflorescences; flowering and fruiting pedicels 1–4 mm long, c. 1 mm diam, densely covered with appressed hairs; bracts 4–5, depressed ovate, 1–1.5 mm long, outer side densely covered with appressed hairs; flower buds globose; sepals shallowly to broadly ovate-triangular, c. 2 by 1.5–2.5 mm, outer side rather densely covered with appressed hairs; petals white to pinkish white in vivo, ovate, 3–7 by 2–5 mm, outer (and also inner) side rather densely covered with appressed hairs; stamens c. 30, 2–3 mm long, apex of connective narrowly triangular to narrowly oblong; carpels ≤ 8. Monocarps 1–7, green, maturing reddish black in vivo, black to brown in sicco, ellipsoid, 9–13 by 6–9 mm, sparsely covered with appressed hairs, apex apiculate (apiculum to c. 1 mm long), wall 0.2–0.5 mm thick, stipes 1–2 by 1 mm. Seed ellipsoid to oblongoid, or obovoid, 9–13 by 5–8 mm, pale reddish brown, surface transversely striate, ruminations composed of flattened pegs or lamellate in 4 parts.

Map 11 Distribution of Oxandra sessiliflora (●) and O. surinamensis (●).

Distribution — Brazil (Bahia, Ceará, Maranhão, Pará, Par- aíba, Piauí, Rio de Janeiro, Tocantins).

Habitat & Ecology — In dry vegetations like caatinga, cerrado, sometimes in forest on terra firme, on sandy soil. At elevations of 0– 360 m. Flowering: January to April; fruiting: March to May.

Vernacular name — Brazil: Cundurú (Barroso & Guimaraes 23, Chaves 1133415, Emperaire 2214, 2214A, 2236).

Uses — Wood used (‘Madeireira’) (Chaves 1133415, Brazil).

Field observations — Flowers very fragrant, reminiscent of lemon (Schatz et al. 815, 856, Brazil); wood bleeding red (Schatz et al. 857, 906, 941, Brazil).

Note — Oxandra sessiliflora , confined to SE and E Brazil, is one of the most easily distinguishable species by its very small, shiny, acutely tipped leaves, almost sessile flowers, and by the presence of a rather dense indument on both young twigs and petals. It is different from the similar-looking O. reticulata by the number of bracts (4–5 vs 1–2), flat to slightly impressed primary vein (vs slightly raised to flat in O. reticulata ), and the presence of indument on both young twigs and petals.

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