Monographs Details: Tapeinostemon longiflorum Maguire & Steyerm. var. longiflorum
Authority: Maguire, Bassett. 1978. The botany of the Guayana Highland--part XI. Mem. New York Bot. Gard. 32: 1-391.
Family:Gentianaceae
Description:Latin Diagnosis - Corollis 12-16 mm longis, aliquantum salviformibus.

Distribution and Ecology - Distribution. A subshrub to 3 m, of open areas. Known only from Cerro de la Neblina. VENEZUELA. Territorio Amazonas: basally woody, flowers white, upper escarpment slopes at 1700-1800 m, 24 Dec 1953, Maguire, Wurdack & Bunting 36843 (NY, US); sprawling shrub 1-2 m, flowers white, occasional on upper escarpment slopes east of Camp 3, 1600-1800 m alt, 27 Dec 1953, Maguire, Wurdack & Bunting 36928 (NY, S, MB, F); 13 Jan 1954, Maguire, Wurdack & Bunting 37255 (paratypes NY, US, F, VEN); 17 Nov 1957, Maguire, Wurdack & Maguire 42134 (holotype NY, isotypes VEN, K, US); herb 1-2 m, infrequent along streamcourse, cumbre, 5-18 km W of Cumbre Camp, 2000 m alt, 1-2 Dec 1957, Maguire, Wurdack & Maguire 42267 (NY, VEN, US); flowers white, escarpment trail, east head of Cañon Grande, 2200 m alt, 17 Dec 1957, Maguire, Wurdack & Maguire 42432 (NY, K, RB).

Discussion:la Tapeinostemon longiflorum Maguire & Steyermark var longiflorum Type. Subshrub 1 m high, flowers white, occasional, trail camp to North Escarpment, 1800 m altitude, Cerro de la Nebhna, Territorio Amazonas, Venezuela 17 Nov 1957, Bassett Maguire, John J. Wurdack & Celia K. Maguire 42134 (holotype NY, isotypes VEN, K, US). Paratype. Reclining shrub 1.5-3.0 m, flowers white, frequent, upper slopes below NW escarpment between Camp 4 and Cumbre Camp, 1500-1700 m, 13 Jan 1954, Maguire, Wurdack & Bunting 37255 (NY, US, F, VEN).