Tetrameranthus umbellatus (Westra, Lubbert Y.T. & Maas, Paul J. M. 2012)
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Genus: Tetrameranthus
Name
Tetrameranthus umbellatus Westra, Lubbert Y.T., 2012 – Wikispecies link – Pensoft Profile
- Tetrameranthus umbellatus Westra, Lubbert Y.T., 2012, PhytoKeys 12: 14-15.
Description
Description. Tree, 8-25 m tall, 15-25 cm diam., young twigs and petioles densely to rather densely covered with stellate hairs <0.2 mm long, becoming glabrous. Leaves: petioles 5-25 mm long, 1.5-3 mm diam., lamina narrowly obovate or narrowly elliptic-obovate, 15-30 by 4-9 cm (index 2.4-4.7), chartaceous, greenish brown to brown above, pale greenish brown to brown below in sicco, sparsely covered with stellate hairs to glabrous above, rather densely to sparsely covered with stellate hairs on primary vein and sparsely covered to glabrous otherwise below, base acute to attenuate, decurrent along the petiole, apex acute to (abruptly) acuminate (acumen 5-10 mm long), primary vein flat to slightly impressed above, secondary veins 13-20 on either side of primary vein, slightly impressed to raised above, loop-forming, shortest distance between loops and margin 0.5-2 mm, tertiary veins flat to raised above, percurrent to more or less reticulate. Inflorescences up to 5-flowered, umbel-like; peduncles 5-25 mm long, c. 1.5 mm diam., densely to rather densely covered with stellate hairs, becoming glabrous in age, fruiting peduncles to c. 3 mm diam., bracts 4, oblong, 4-5 mm long, outer side densely covered with stellate hairs, falling before flowering, pedicels 25-70 mm long, ≥1 mm diam., densely to rather densely covered with stellate hairs, becoming glabrous in age, fruiting pedicels to c. 3 mm diam. Flowers green, maturing yellow in vivo; sepals broadly triangular-ovate to ovate, connate just at the base, to c. 4 by 3-5 mm, outer side densely covered with stellate hairs; outer petals ovate-elliptic, 16-20 by 9-12 mm, densely to rather densely covered with stellate hairs, the inner base with small glabrous area, inner petals elliptic, 13-17 by 6-7 mm, indument as in outer petals, the glabrous inner base slightly larger; stamens ≤1 mm long, connective shield cushion-shaped, flat. Monocarps 2-7, orange or red in vivo, brownish black in sicco, ellipsoid to oblongoid, 2-seeded forms to c. 45 by 20 mm and with oblique constriction, 1-seeded forms smaller and without constriction, mostly rounded at the apex. Seeds 1-2 per monocarp, to c. 25 by 18 mm.
Distribution
Distribution. Amazonian Peru (Amazonas, Huanuco, Loreto) and Brazil (Amazonas, Para).
Taxon Treatment
- Westra, Lubbert Y.T.; Maas, Paul J. M.; 2012: Tetrameranthus (Annonaceae) revisited including a new species, PhytoKeys 12: 14-15. doi
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