ridged on the convex side; chromosome number, 2n= 24. 
Cotompra: Dept. of Cauca, Municipality of Puracé, northern slope 
of the Volean de Puracé, alt. 2700-2800 m., July 28, 1956, 4.8. 
Barclay & R. FE. Schultes 147 (Vyvn: GH).-——Same locality and date, 
A. S. Barclay & R. EF. Schultes 149 and 177 (GH).—Between Puracé 
and its paramo, Chiquin, heath-brush, alt. 2700-3100 m., July 11, 
1989, E. Pérez-Arbeldez & J. Cuatrecasas 5960 (F, US, COL.).—Pu- 
racé, alt. 8800 m., Feb. 1938, A. von Sneidern 1S9S (US).—Paletara 
to Calaguala, alt. 83000-8200 m., July 17, 1922, F. WW. Pennell 70928 
(GH, NY, US). 
In 1956, during my field studies of the tree Daturas 
in the Colombian Andes, | was surprised to find on the 
side of the famous and active Volcan de Puracé popula- 
tions of what was at once distinguishable as a striking 
and beautiful new species of the genus. Herbarium speci- 
mens, fixed buds tor cytological study, about 50 pounds 
of leaves tor chemical analysis and living material in the 
form of cuttings and seeds for horticulture were gathered. 
Karlier specimens which had been collected in the same 
general vicinity on the slopes of the volcano and which 
also represent the new species had been filed in our her- 
baria under the name Datura sanguinea Ruiz & Pavon. 
D. vuleanicola seems to be most closely related to J. 
sanguinea on the Basis of comparative morphology. 
Although Datura sanguinea is a highly variable spe- 
cies, D. vuleanicola may readily be distinguished from it 
by a number of characters, among the most prominent 
of which are its warty fruit and its smooth seeds. The 
fruit has a hard, almost woody pericarp and is attached 
to the branch by a stout peduncle which becomes nearly 
as thick as the branch supporting it. J. sanguinea, on the 
other hand, is characterized by its smooth, more fleshy 
fruit which is attached by an elongated, relatively un- 
thickened peduncle and by its verruculose seeds. 
The flowers of the new species are cernuous or nodding 
at a 80 to 45 degree angle, with a glabrous, nearly satin- 
