Brassia rhizomatosa Garay & Dunst. 1965

TYPE Drawing Photo by Karl Senghas/Type Drawing by Dunsterville & Garay and The Swiss Orchid Foundation at the Jany Renz Herbaria Website

Part shade CoolFall

Common Name The Rhizome Brassia [refers to the distant pseudobulbs on the rhizome]

Flower Size

Found in Venezuela and Peru small sized, cool growing epiphyte with a tough, fairly thin rhizome with more than 1.6" [4 cm]between each smooth, darkish green, highly compressed, ancipitious, narrowly ovoid pseudobulbs enveloped at the base by a few large bright green, imbricate, acute, non-foliaceous sheaths and carrying a single, apical, fairly rigid, oblong to oblong-elliptic, mid nerve finely and sharply carinate apically becoming roundly and sharply carinate at the base, acute leaf that blooms in the fall on a horizontal to slightly arching, smooth reddish brown, thin, 10 to 14" [25 to 35 cm] long overall, peduncle to 4 to 4.8" [10 to 12 cm] long, rachis 6 to 10" [15 to 25 cm] long, 5 to 6 flowered inflorescence.

Some references put this species as a synonym of B arcuigera and others as B longissima, I follow Kew in keeping this as a separate species.


References W3 Tropicos, Kew Monocot list , IPNI ; *Venezuelan Orchids Illustrated Vol 3 Dunsterville & Garay 1965 drawing fide; Flora de Venezuela Volumen XV Part 5 Foldats 1970 as Brassia rhizomatosa drawing fide; Orchids of Venezuela ; An Illustrated Field Guide Vol 1 Dunsterville & Garay 1979 as B rhizomatosa drawing fide; Icones orchidacearum Peruviarum Plate 214 Bennett & Christenson 1995 as B rhizomatosa drawing ok; Rudolf Schlechter Die Orchideen Lieferung 33-6 1997 as B rhizomatousus drawing good;