PHARMACAL PLANTS AND THEIR CULTURE. 
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305. Delphinium trolliifolium Gray. Larkspur. Banunculacece. 
Occurs from California northward into Oregon and British Colum- 
bia. Requires further study. 
306. Delphinium variegatum T. and G. Sacramento larkspur. 
Banunculacece. 
Poisonous. 
307. Dicentra chrysantha H. and A. Dutchman’s breeches. 
Fumariacece. 
Grows on high, dry ridges. Requires further study as to active con- 
stituents. Perhaps contains an alkaloid like that of D. canadensis. 
(W. T. Wenzell, Am. Journ. Pharm. 205, 1855.) 
308. Dicentra farmosa D.C. Dutchman’s breeches. Bleeding 
heart. Fumariacece. 
Found in shady woods. Said to be tonic, diuretic and alterative. 
Extensively used by the eclectics. 
309. Digitalis purpurea L. Foxglove. Digitalis. Scrophulariacece. 
An European plant, introduced everywhere ; has escaped from culti- 
vation and occurs spontaneously in several places along the entire 
Pacific coast as far north as Vancouver Island. Extensively groivn 
in California. According to chemical analyses, the American article 
is fully as active as the European (English). Easy of cultivation. 
Thrives best in rather sandy, fairly rich, loose soil. Should be 
attempted on a large scale (several acres or more). Plant in rows 
and cultivate not unlike sugar-beet or potatoes. Full grown, bright 
green leaves of the second year’s growth only are collected, at the 
time of flowering. Spread leaves thinly and dry quickly, carefully 
and uniformly. When dry, keep in tightly-closed, dry packages in 
dry place. Should be marketed promptly, as the drug deteriorates 
rather quickly (one year and less). A very useful drug, heart tonic, 
poisonous. Market value per pound, for good material, about forty 
cents. 
310. Dioscorea species. Yarn root. Dioscoreacece. 
Most species are cultivated. Edible, tuberous roots, very rich in 
starch. The eclectics use the roots of D. villosa in bilious colic and 
the negroes of the southern states use them in the treatment of rheu- 
matism. 
311. Diospyros virginiana L. Persimmon. Styracece. 
Cultivated in the southern portions of the State. The unripe fruit 
is very astringent, rich in tannin, used in diarrhoea, dysentery, uterine 
hemorrhage. The bark is also very astringent and similarly used. 
