Brachyotum angustifolium Wurdack
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Authority
Wurdack, John J. 1953. A revision of the genus Brachyotum (Tibouchineae-Melastomataceae). Mem. New York Bot. Gard. 8 (4): 343-407.
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Family
Melastomataceae
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Scientific Name
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Description
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Latin Diagnosis - Hypanthii et laminanim superficiei inferae trichomata basi sparse minuteque muricata ceterarura partium laevia. Ramuli novelli obscure quadrangulati, cum petiolis pedunculis pedicellisque dense longo-strigulosi. Petiolus 1-4 mm. Lamina 7-17 x 1.5-3.5 mm. anguste oblonga apice basique obtusa, nervis primariis 3 supra impressis subtus expressis, secundariis obsoletis; supra tuberculis 5-7/mm.2 in series 6 regulariter dispositis dense onusta, tuberculo basi 0.3-0.5 mm. diam. abrupte setifero seta appressa 0.1-0.3 mm. longa; subtus densissime strigulosa 30-40/mm.2 Flores 5-meri saepe terni; dichasii pedunculus gracilis 10-20 x 0.5 mm., bracteolis ad basim dichasii 4-6 x 0.5-0.7 mm. linearibus vel leviter spathulatis valde (ante anthesim) caducis supra glabris vel apicem versus strigulosis subtus modice strigulosis. Pedicellus sub bracteolis 0.5-2 mm., super 5-8 mm.; pedicelli bracteolae 2-5 x 0.2-0.7 mm. lineares uninerviae valde caducae supra glabrae subtus sparse strigulosae. Hypanthium 4-5 x 3.5-4.5 mm. triangularia vel ovato-triangularia apice acuta basi per 0.5-0.7 mm. cohaerentia sinu late acuto. Petala 10-11 x 6-7 mm. asymmetrice obovata apice oblique truncata, ciliis glanduliferis 0.1-0.7 mm. Filamenta 5-5.5 mm.; antherae 4.5-5 mm.; connectivum basi antherae nee producto nee libero. Stylus 20 x 0.6 mm., per 7 mm. exsertus. Ovarium 4-5 x 2.5-3 mm. apice per 2-2.5 mm. modice longo-strigulosum setis pro parte glandulosis, lobis apicalibus super Ioculos 0.2-0.4 mm.
Distribution and Ecology - Distribution: Dept. Amazonas, Peru, alt. 3000-3300 m. Chachapoyas, Weberbauer 4426 (BR); without locality (but probably from Chachapoyas), Matbews 1231 (BR).
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Discussion
Type Collection and Locality: Matbews 1253 (HOLOTYPE K); Peru, Dept. Amazonas, "Bajasan, Prov. Chachapoyas, 1835."
Type Photograph: Gleason 27-11 (Weberbauer 4426, destroyed paratype at B).
B. angustifolium is closely related to B. rostratum but differs in the nearly smooth trichomes, narrowly oblong leaves with length/width ratio greater than 3.5 (mostly greater than 4) and with constantly 6 rows of tubercles on the adaxial surface, and the linear early caducous bracts; the length/width ratio is approximated by the young leaves of part of B. rostratum (B. microphyllum), but the tubercles in even these elements are rather irregularly arranged in 10 or more rows. B. seorsum may be distinguished by the leaves of different shape with tubercles disposed in 8 or more irregular rows, the glandular hypanthia, and the differently shaped sepals.