Monographs Details: Chelonanthus angustifolius (Kunth) Gilg
Authority: Maguire, Bassett. 1989. The Botany of the Guayana Highland- Part XIII. Mem. New York Bot. Gard. XIII: 1-127.
Family:Gentianaceae
Description:Distribution and Ecology - Colombia, to Guyana and Brazil. Throughout Guyana at lower and upper altitudes. BRAZIL, territorio do roraima: Serra Tepequem, Rio Branco, occasional at 850 ft alt., annual 6-10 dm high, flowers greenish, 22 Nov 1954, Maguire & Maguire 40018 (NY); base of Serra Tepequem, Boca da Mata, dry places in grassy campo, herb 1 m tall, corolla pale green, 10 Feb 1967, Prance, Forero, Pena & Ramos 4295 (NY).

Discussion:

Type. "In radicibus montis Duidae, prope Esmeraldam" Amazonas, Venezuela, Humboldt & Bonpland (P).

Lisianthus angustifolius Kunth, Nov. Gen. et Sp. 3: 181. 1818.

Chelonanthus pyriformis Gleason, Bull. Torrey Bot. Club 58: 450. 1931.

Lisianthus pyriformis (Gleason) Steyermark, Fieldiana Bot. 28:498. 1953.

Irlbachia alata (Aublet) Maas subsp. angustifolia (Kunth) Persoon & Maas, Proc. Kon. Ned. Akad. Wetensch. Ser. C. 88(4): 409. 1985

Specimens examined. VENEZUELA, territorio amazonas: Esmeralda, ca. 325 ft alt., 3 Oct 1928, Tate 181 (NY); dry crests of Savanna Hills, flowers yeUow, summit of Mt. Duida, 4400 ft aft., Aug 1928-Apr 1929, Tate 747 (NY, type oi Chelonanthus pyriformis Gleason); South and East Rim, Cerro Sipapo, 6000- 6500 ft alt., annual herb, flowers green, occasional, 26- 28 Jan 1949, Maguire & Politi 28633 (NY); Rio Cunucunuma, Culebra, 150 m alt., annual to 1.5 m high with greenish-white corollas, frequent, 14 Nov 1950, Maguire, Cowan & Wurdack 29440 (NY); cumbre, Cerro Moriche, 1250 m alt., flowers light green, occasional, 15 Jan 1951, Maguire, Cowan & Wurdack 30932 (NY); savanna at W base of Cerro Paru, at base camp on Cafio Asisa, 200 m alt., flowers green, occasional, 16 Feb 1951, Cowan & Wurdack 31508 (NY); occasional in dry savanna, Palomar, nr. Rio Orinoco, 15 km S of Puerto Ayacucho, herb 0.5-1 m, flowers greenish-white, 100-120 m ah., 9 Nov 1953, Maguire, Wurdack & Bunting 36096 (NY); dome on right bank of Rio Siapa just below Raudal Gallineta, open laja, 130-900 m alt., 0.7-1.5 m tall, 21 Jul 1959, Wurdack & Adderiey 43552 (NY); Cerro Cariche, sandstone hill nr. left bank of Rio Orinoco, halfway between Tama- Tama and San Antonio, occasional, herb 0.501 m high, flowers greenish-white, 125-150 m alt., 29 Jul 1959, Wurdack & Adderiey 43659(NY). bolivar: Kavanayen savannas and rocky elevations, 1300 m alt., annual herb with greenish flowers, frequent, 30 Mar 1952, Maguire 33712 (NY); large savanna, vie. of Uriman, 300 m alt., nr. morichal, 30 Apr 1953, Steyermark 75290 (VEN); frequent in central westem lobe of Cerro Marimota (with laguna at base of mountain), Rio Parguaza, 5 km from mouth, 100-200 m alt., flowers green, 4 Jan 1956, Wurdack & Monachino 41108 (NY); selva de galeria y sabana a lo largo del Rio Kanarakuni, norte y noroeste de la Mision de Campamento Sanidad del Rio Kanarakuni, savanna, 400 m ah., 17-29 Mar 1967, Steyermark 97756 (VEN).