Monographs Details:
Authority:
Wurdack, John J. 1953. A revision of the genus Brachyotum (Tibouchineae-Melastomataceae). Mem. New York Bot. Gard. 8 (4): 343-407.
Wurdack, John J. 1953. A revision of the genus Brachyotum (Tibouchineae-Melastomataceae). Mem. New York Bot. Gard. 8 (4): 343-407.
Family:
Melastomataceae
Melastomataceae
Description:
Species Description - Trichomes smooth. Branchlets obscurely quadrangular, very densely rufolanulose. Petiole 3-10 mm. Blade 16-38 x 11-19 mm., elliptic to elliptic-ovate with the apex broadly acute to obtuse and the base obtuse, with three primaries and sometimes also 2 faint marginals on the larger leaves, mostly hidden by the pubescence; above very densely loose-strigulose, the. fine hairs 12-20/mm.2; below very densely rufo-lanulose, the hairs 35-40/mm.2and to 2 mm. long. Flowers 5-merous, solitary on short leafy lateral branchlets. Pedicel 3-4 mm. above the last persistent undifferentiated leaves (bracteoles ?). Hypanthium 5-7x6-6.5 mm., 0.3-0.9 mm. thick medianly, very densely rufo-lanulose with hairs to 3.5 mm. long. Sepals 8-9o5 x 5.5-6 mm., oblong-lanceolate to lanceolate with the apices narrowly to broadly acute, united at bases 0.7-1.1 mm., the sinuses acute, inside moderately strigulose on the apical 1/3-3/4. Petals deep purple, 13-16 x 11-13 mm., obovate with the apices very broadly obtuse, the gland-tipped cilia 0.1-0.3 mm. Filaments 6-6.5 mm.; anthers 5.5-6.5 mm.; connective at anther base 0.8-1 mm., free of the anther 0.4-0.5 mm., the ventral lobing 0.2-0.4 mm. Style 26 x 0.9 mm., exserted 5 mm. Ovary 5-7.5 x 3.5-4 mm., densely strigulose with gland-tipped hairs on the apical 2-3.5 mm., the apical lobes 0.7-1 mm. above the locules.
Distribution and Ecology - Distribution: Dept. Amazonas, Peru, alt. 2800-2900 m.
Species Description - Trichomes smooth. Branchlets obscurely quadrangular, very densely rufolanulose. Petiole 3-10 mm. Blade 16-38 x 11-19 mm., elliptic to elliptic-ovate with the apex broadly acute to obtuse and the base obtuse, with three primaries and sometimes also 2 faint marginals on the larger leaves, mostly hidden by the pubescence; above very densely loose-strigulose, the. fine hairs 12-20/mm.2; below very densely rufo-lanulose, the hairs 35-40/mm.2and to 2 mm. long. Flowers 5-merous, solitary on short leafy lateral branchlets. Pedicel 3-4 mm. above the last persistent undifferentiated leaves (bracteoles ?). Hypanthium 5-7x6-6.5 mm., 0.3-0.9 mm. thick medianly, very densely rufo-lanulose with hairs to 3.5 mm. long. Sepals 8-9o5 x 5.5-6 mm., oblong-lanceolate to lanceolate with the apices narrowly to broadly acute, united at bases 0.7-1.1 mm., the sinuses acute, inside moderately strigulose on the apical 1/3-3/4. Petals deep purple, 13-16 x 11-13 mm., obovate with the apices very broadly obtuse, the gland-tipped cilia 0.1-0.3 mm. Filaments 6-6.5 mm.; anthers 5.5-6.5 mm.; connective at anther base 0.8-1 mm., free of the anther 0.4-0.5 mm., the ventral lobing 0.2-0.4 mm. Style 26 x 0.9 mm., exserted 5 mm. Ovary 5-7.5 x 3.5-4 mm., densely strigulose with gland-tipped hairs on the apical 2-3.5 mm., the apical lobes 0.7-1 mm. above the locules.
Distribution and Ecology - Distribution: Dept. Amazonas, Peru, alt. 2800-2900 m.
Discussion:
Type Collection and Locality: Mathews s.n. (HOLOTYPE G-BOIS; isotypes BR, NY); "in Peruviae ad Chachapoyas."
Type Photograph: F36853 (holotype).
B. barbeyanum is very similar to B. parvifolium, but differs in the generally larger proportions, glandular ovary pubescence, and petal color.