DATURAS SAFFORD. 



563 



ready mentioned, several others, closely allied to Datura arborea^ 

 have been described, including Datura aurea Lagerheim, which bears 

 beautiful golden-yellow flowers; Datura dolichocarpa (Lagerh.) and 

 D. versicolor (Lagerh.), which have very long and slender fruits; 

 Datura suaveolens H. & B., distinguished by its inflated five-toothed 

 calyx and its coherent anthers, which has a spindle-shaped fruit (fig. 

 12) ; and Datura pitUeri Safford, a Colombian species, with narrowly 

 oblong fruit (pi. 10). Differing from the spe- 

 cies mentioned above in their narrower corolla 

 and short inflated calyx and also in their fruits, 

 which have a persistent husklike calyx about 

 the base, are two red-flowered daturas, one of 

 which with entire upper leaves was described 

 by Ruiz and Pavon under the name Datura 

 sanguinea, while the other, with the upper 

 leaves coarsely toothed and densely velvety, 

 has been recently segregated by the writer 

 under the name Datura rosei. Still another re- 

 cently described red-flowered species, Datura 

 rubella Safford, is readily distinguished from 

 the preceding by the long caudate apex of its 

 calyx. 1 



DATURA SUAVEOLENS, THE ANGEL'S 

 TRUMPET. 



Plate 11. 



The tree datura most commonly cultivated 

 in conservatories is Datura suaveolens, a spe- 

 cies often miscalled D. arborea. As stated 

 above it can readily be distinguished by its co- 

 herent anthers and by its much inflated calyx, 

 which never ends in a point but has several 

 terminal teeth. Its chief distinction from Da- 

 tura Candida and D. arborea is the form of its 

 fruit, which is spindle-shaped. (Fig. 12.) 

 This is the " fleur trompette " of the French Antilles. It is widely 

 cultivated in the West Indies. Willclenow attributes its origin to 

 Mexico, but all the herbarium specimens of tree daturas from Mexico 

 seen by the writer belong to the species Datura Candida {Datura 

 arborea R. & P., not D. arborea L.). Fruiting specimens in the 

 United States National Herbarium were collected in the Province of 

 Minas Geraes, Brazil, by Regnell. That this species seldom pro- 

 duces fruit in cultivation is in all probability due to the absence of 

 the humming birds or sphingoid moths by which it is pollinated in 

 its natural habitat. 



Fig. 12. — Spindle - shaped 

 fruit of the Brazilian 

 Datura suaveolens. 



1 See Journ. Wash. Acad. Sci., 11 : 185, 188, 1921. 



