Monographs Details: Utricularia juncea Vahl
Authority: Maguire, Bassett. 1967. The botany of the Guayana Highland--Part VII. Mem. New York Bot. Gard. 17: 1-439.
Family:Lentibulariaceae
Scientific Name:Utricularia juncea Vahl
Description:Distribution and Ecology - Sandy or muddy lake shores and sandy savannas from sea level to alt 1920 m, eastern U.S.A., the West Indies, British Honduras, Trinidad and throughout Guayana but not further south than Rio Branco and Amapa in Brazil. BRAZIL. Rio Branco, Sao Marcos, Ule 7884 (K); Amapa: Rio Matapi, Pires A Cavalcante 52124 (K, NY). VENEZUELA. Bolivar; Mount Roraima, alt 1260 m, Tate 269 (NY, VEN) ; near Uriman, alt 300 m, Steyermark 75297 (NY, YEN ( ; alt 393 m, Steyermark & Wurdack 11 (K, NY, VEN); between Luepa and Cerro Venamo, alt 1300 m, Steyermark & Nilsson 775 (VEN); Rio Uarama, NE of Luepa, alt 1220 m, Steyermark & Nilsson 689 (VEN) ; Rio Hacha, Canaima region, Agostini 279 (VEN); Amazonas: summit of Cerro Duida, alt 1025-1200 m, Steyermark 58268. BRITISH GUIANA. Upper Mazaruni River Basin, Partang River, Merume Mountains, alt 460 m, Maguire, Tillett & Tillett 43828 (K, NY); Ayanganna Plateau, alt 740 m, Tillett, Tillett & Boyan 45208 (K, NY) ; Southern Pakaraima Mts., Ando Savanna, alt 720 m, Maguire, Maguire & Wilson-Browne 46189A (K, NY).

Discussion:

Utricularia angulosa Poir., Encyc. 8: 273. 1808. Type. ‘Cayenne,’ Martin (K, P).

Utricularia stricta G.F.W. Mey., Prim. Fl. Esseq. 14. 1818. Type. British Guiana, Essequibo (GOET).

Utricularia personata Le Conte, Ann. Lyc. Nat. Hist. N. Y. 1: 77. 1824. Type. U.S.A. (?).

Utricularia sclerocarpa Wright apud Sauvalle, Anal. Acad. Ci. Habana 6: 315. 1869; FI. Cub. 91. 1873. Type. Cuba, Wright 3620 (K).

Utricularia simplex Wright apud Sauvalle, Anal. Acad. Ci. Habana 6: 315. 1869; FI. Cub. 91. 1S73. Type. Cuba, Wright 3619 (K).

Utricularia cornuta Michx. var michauxii Gomez, Anal. Hist. Nat. Madrid 19 : 264. 1890, nom. nud.; Steyermark, Fieldiana Bot, 28: 1096. 1953 partly excl. svn. U. erectiflora St. Hil.

Utricularia virgatula Barnhart, Bull. Torrey Club 34 : 580. 1908. Type. U.S.A. New York, Barnhart s.n. (P, photo).

Utricularia juncea Yahl f virgatula (Barnh.) Fern., Rhodora 46 : 60. 1946; P. Taylor, FI. Trinidad Tobago 2(5): 295. 1955.

Type. ‘Cajenna,’ Richard (holotype C, isotype P).

Steyermark reduced U. juncea Yahl to varietal rank under V. cornuta Michx. but the name he adopted is not validly published. Recent research (not yet completed) shows that the two taxa have different (though widely overlapping) distributions and different pollen. As truly intermediate forms are apparently infrequent I prefer for the present to treat U juncea as a distinct species. U. simplex Wright (U. sclerocarpa Wright, U. virgatula Barnh.) is certainly only a cleistogamous form of U. juncea.

Distribution:Brazil South America| West Indies| Honduras Central America| United States of America North America| Trinidad and Tobago South America| Guyana South America|