Oxandra unibracteata J.C.Lopes, Junikka & Mello-Silva

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

publication ID

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

persistent identifier

https://treatment.plazi.org/id/038A142D-6412-B271-264C-FEC1B690F98D

treatment provided by

Felipe

scientific name

Oxandra unibracteata J.C.Lopes, Junikka & Mello-Silva
status

 

25. Oxandra unibracteata J.C.Lopes, Junikka & Mello-Silva View in CoL — Map 9

Oxandra unibracteata J.C. Lopes, Junikka & Mello-Silva (2013) View in CoL 25, f. 1, 2. — Type: I.A. Silva 272 (holo SPF; iso CVRD, MO, RB, U), Brazil, Espírito Santo, Linhares, Reserva Natural Vale , Estrada Flamengo km 11, 30 Nov. 1981.

Oxandra sp. 2 Junikka in Maas et al. (2001) 84.

Tree 16–25 m tall, 20–35 cm diam; young twigs glabrous. Leaves: petiole 2–5 mm long, c. 1 mm diam; lamina narrowly elliptic, 4–8 by 1–3 cm (leaf index 2.6–3.8), coriaceous, not verruculose, but reddish black punctate below, shiny and greyish green above, brownish green below, glabrous above and below, base acute to slightly attenuate, apex bluntly acute, primary vein slightly raised above, secondary veins distinct, 8–10 on either side of primary vein, raised above, angle of secondary veins with primary vein 45–70°, smallest distance between loops and margin c. 1 mm, tertiary veins distinctly raised above and below, reticulate. Flowers solitary; flowering and fruiting pedicels 10–14 mm long, 0.5–1 mm diam, glabrous, bract 1, depressed ovate, c. 1 mm long, outer side glabrous; flower buds globose; sepals connate for up to half of their length broadly ovate-triangular, 1–1.5 by 2 mm, outer side glabrous; petals bright green in vivo, elliptic to circular, 4–5 by 2–4 mm, outer side glabrous; stamens c. 20, c. 2 mm long, apex of connective quadrangular; carpels ≤ 5. Monocarps 1–5, greenish red in vivo, black in sicco, ellipsoid, 15–18 by 11–13 mm, glabrous, apex rounded, wall 0.5–0.7 mm thick, stipes 7–8 by 1 mm. Seed ellipsoid, 10–15 by 10–11 mm, brown, surface minutely pitted to transversely striate, ruminations lamellate in 4 parts.

Distribution — Brazil (Espírito Santo).

Habitat & Ecology — In non-inundated, high Atlantic Forest. At elevations of 0– 100 m. Flowering: November; fruiting: May.

Vernacular name — Brazil: Imbiú-preto (Folli 545, I.A. Silva 272).

Notes — Oxandra unibracteata , only known from the type locality in the Brazilian state of Espírito Santo, is one of the most distinctive species in the genus by its long and glabrous pedicels, which are provided with only one bract! This is rather unusual for Oxandra , which commonly has 4 or more bracts. The only other species is the very similar O. reticulata which has 1–2 bracts and, moreover, shorter pedicels.

Other features are the completely glabrous leaves, which have a strong reticulation on both sides.

Kingdom

Plantae

Phylum

Tracheophyta

Class

Magnoliopsida

Order

Magnoliales

Family

Annonaceae

Genus

Oxandra

Loc

Oxandra unibracteata J.C.Lopes, Junikka & Mello-Silva

Junikka, L., Maas, P. J. M., Maas-van de Kamer, H. & Westra, L. Y. Th. 2016
2016
Loc

Oxandra unibracteata J.C. Lopes, Junikka & Mello-Silva (2013)

J. C. Lopes, Junikka & Mello-Silva 2013
2013
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