Monographs Details: Sobralia liliastrum Lindl.
Authority: Schweinfurth, Charles. 1967. Orchidaceae of the Guayana Highland. Mem. New York Bot. Gard. 14: 69-214.
Description:Distribution and Ecology - BRITISH GUIANA. Roraima, R. Schomburgk s.n. Kaieteur Plateau, locally commonly terrestrial, up to 2 m high, flowers white, lip frilled and yellow inside, May 12, 1944, B. Maguire eir D. B. Fanshawe 23419. COLOMBIA. Vaupes: at the confluence of Rios Macaya and Ajaju, Mt. Chiribiquete, 500-640 m alt. (240-360 m above forest floor), with quartzite base, 4 ft tall. May 15-16, 1943, R. E. Schultes 5469; Cerro Yapoboda, Rio Kuduyari (tributary of Rio Vaupes), in quartzite savanna, 450 m alt., flowers white, lip yellow at tip, October 5, 1951, R. E. Schultes & I. Cabrera 14243; same locality as the last, near headwaters, lat. 1°20' N., long. 70° 30' W., about 270-300 m alt., terrestrial, flowers white, April 1953, Schultes & Cabrera 19976, 20037; Rio Negro, San Felipe and vicinity (below confluence of Rio Guainia and Rio Casiquiare), about 180 m alt., lat. 1° 50'N., long. 67° 0'W., 5 ft tall, flowers white with yellow lip, October 25, 1952, R. E. Schultes, R. E. D. Baker & I. Cabrera 18001; Rio Piraparana (tributary of Rio Apaporis), Caño Teemeeiia, between lat. 0°15'S., long. 70° 30'W. and lat. 0° 25' N. long. 70° 30' W., terrestrial in clumps or dense stands 8-9 ft high, flowers white with yellow lip having a white fringe, September 6, 1952, R. E. Schultes & I. Cabrera 17232; Rio Kubiyii (tributary of Rio Vaupes), Cerro Karienda, savannas with quartzite base, about 15 miles upstream from mouth, about 240-270 m alt., lat. 1° O'N., long. 70° 15'W., terrestrial 4 ft tall, flowers white with lip yellow in center, faintly fragrant, November 10, 1952, Schultes 6- Cabrera 18310; Rio Karurii (tributary of Rio Vaupes), Mesa de Yambi, savanna Goo-rdn-hoo-da with quartzite base, about 290-300 m alt., lat. 1° 20'N., long 71° 20'W., terrestrial 4 ft high, flowers white with yellow lip, April 15-16, 1953, Schultes & Cabrera 19122; Rio Vaupes, between Mitii and Javaret^, Yutica, terrestrial, flowers white with yellow lip. May 14-24, 1953, Schultes 6- Cabrera 19384. VENEZUELA. Bolivar: Cerro de las Guacamayas, 600-900 m alt., September 6, 1954, Bernardi 1660; Altiplanicie de Auyan-tepui, 1000 m alt., in rocky savanna, flowers white. May 5, 1937, F. Cardona 53; Canaima, Rio Uaiparii, Mariwd Falls, G. C. K. Dunsterville 320; Gran Sabana, "between Mission of Santa Teresita de Kavanayen northwest to Rio Karuai, on large mesa," in dry rocky thickets on uneven ground, 1220 m alt., stems erect, 3-5 ft tall, leaves stiffly erect, rich green, sepals and petals white, petals curved and twisted in spiral, lip white with a deep yellow throat, October 26, 1944, J. A. Steyermark 59387; Sororopan-tepui, crest of cerro between east and west ends, 2255 m alt., near stream on savanna-covered slope toward eastern end, erect terrestrial, flowers white, lip with golden and orange stripes in throat not reaching margin, column white with golden tip below, November 14, 1944, Steyermark 60117; Cerro San Borja, also on Cerro Canichana (C. Gavilan) and on laja along Rio Parguaza, 100-300 m alt., locally frequent terrestrial, flowers white, lip yellow within, December 12, 1955, J. J. Wurdack & J. V. Monachino 39809. Amazonas: on the inundated banks of Rio Negro, epiphyte, R. Spruce 3049; Rios Casiquiare, Vasiva and Pacimoni, Spruce 3014; on rocky top of Esmeralda Ridge, 100-150 m alt., flowers white with yellow lip, October 6, 1928, G. H. H. Tate 183, 187; Esmeralda Ridge, between Esmeralda and the base of Cerro Duida, 150 m alt., among rocks, terrestrial with erect stems 5-6 ft tall, leaves chartaceous-coriaceous, dark green above with deep sulcations, flowers white, upper half of lateral sepals recurved or twisted, lip with pale yellow in center near tip, August 21, 1944, J. A. Steyermark 57744; Rio Orinoco, about 30 km below La Urbana, 100 m alt., March 14-15, 1949, B. Maguire & B. Maguire, Jr. 29031; Rio Orinoco, Cerro Yapacana, infrequent in Savanna No. 3 at the northwest base of mountain, 100 m alt., terrestrial, flowers white with lip yellowtinged at base, January 1, 1951, B. Maguire, R. S. Cowan & J. J. Wurdack 30563; same locality as the last, occasional in cumbre, 1200 m alt., Maguire, Cowan & Wurdack 30721; Rio Ventuari, Cerro Moriche, frequent in cumbre, 1250 m alt., flowers white with lip yellow at base, Maguire, Cowan & Wurdack 30931; Rio Manapiare, Serrania Yutaje, Cerro Yutaje, frequent on Northwest Ridge, 1400 m alt., terrestrial, stems 5-15 d m high, flower white, lip with yellowish spot, column yellow, February 11, 1953, B. & C. K. Maguire 35155; Rio Orinoco, at the mouth of Rio Atabapo, Cafio Cupaven, 150 m alt., epiphyte, flowers white and yellow. May 11, 1954, J. S. Level 82; Alto Rio Orinoco, occasional on Esmeralda Ridge, 200 m alt., terrestrial in large clumps, flowers ^vhite, lip pale yellow at base, September 20, 1957, B. Maguire, J. J. Wurdack & W. M. Keith 41563; Rio Yatua, Casiquiare, 100-140 m alt., locally abundant on Laja Catipan, terrestrial 1-2.5 tall, flowers white, lip yellow at base, September 26, 1957, B. Maguire, J. J. Wurdack & C. K. Maguire 41583. BRAZIL (type).

Distribution:Guyana South America| Venezuela South America| Brazil South America|