Monographs Details: Oreobolus obtusangulus subsp. rovaginatus (Kük.) T.Koyama
Authority: Maguire, Bassett. 1969. The botany of the Guayana Highland-part VIII. Mem. New York Bot. Gard. 18: 1-290.
Description:Distribution and Ecology - Additional distribution. BRAZIL. Amazonas: Rio Negro, Serra da Neblina, openslopes to base of cliffs, alt 8500-9000 ft, B. Maguire et al 60492 (NY); Rio Negro,summit of Serra da Nebhna, alt 8000-8500 ft, Maguire et al 60540 (NY).
Oreobolus obtusangulus Gaudichaud var rubrovaginatus Kiikenthal, Repert. Sp. Nov. 48: 69.
Type. COLOMBIA. El Boqueron near Bogota, 3200-3700 m, C. Troll 3790
The discovery of Oreobolus obtusangulus from the Serra da Neblina is of considerable
phytogeographical interest. In South America the genus Oreobolus has
hitherto been strictly confined to the Andean region from Chile through Andean
Ecuador and Colombia northward to the State of Tachira of Andean Venezuela. The
two collections cited mark the first record of Oreobolus in the Guayana Highland.
Although the specimens from Neblina lack flowers they precisely agree with Oreobolus
obtusangulus subsp rubrovaginatus of Ecuador and Colombia in every vegetative
aspect. Subspecies rubrovaginatus differs from subsp obtusangulus in the reddish
or orange-brown coloration of leaf sheaths and by the leaf blades that are shiny
and only 3-veined on the obtuse back. In the latter subspecies the leaf sheaths are
grayish, and the leaf blades are dull with prominently ridged three costas on the
Distribution:Brazil South America