138 PLANT NAMES AND SYNONYMS 



688. DIPTERYX, Schreb. 1791. Tonka Bean. Papilioiiaceae.. 



From Greek, "two winged". Syn. Coumarouna Aubl. 1775,, 

 in part. Trees. About 10 species, tropical America. 



a. D. odordta Willd. (Coumarouna odorata Aublet). Guiana. 



Seeds; Semen tonco, Faba tonco; Tonka-bean, Tonga-:}: or 

 Tonquin-J bean, Coumarouraa-bean, Snuff-bean; Ger. Tonka- 

 bohneu; Fr. Tonka [Feve] (Codex); Sp. Haba tonka; rich in 

 couraarin, used for flavoring and in perfumery. 



b. D. oppositifolia Willd. (Coumarouna oppositifolia Aublet). 



Cayenne. English Tonka Bean. Seeds smaller and less frag- 

 rant than those of (a). 



689. DIRCA, L. Leatherwood. Thymeliaoeae. 



Name from a fountain in Thebes. Shrubs with fibrous bark. 

 Two species, both of U. S. 



a. D. pahistris L. Ontario to Florida and west to Minnesota. 

 Leather- wood. Leather-bush, Moose-wood, Swamp- wood, Leav-- 

 er-wood. Lever-wood, American ]\Iezereon, Rope-bark, Wickup, 

 Wicopy. Bark irritant, emetic. 



690. DISPORUM, Salisb. 1812. Disporum. Couyallariaeeae. 



From Greek, ''two ovuled". Syn. Prosartes, Don 1840; 

 Streptopus, in part. Perennial herbs. About. 15 species, N. 

 America and Asia; 8 in V. S. , mostly western. 



691. DISTASIS, DC. - Distasis. - Compositae. 



Svn. Chaetopappa, in part. Herb. One species, southwest- 

 ern U. S. 



692. DITAXIS, Vahl. Ditaxis. Eupliorbiaeeae. 



From Greek, "two ranked", of the stamens. Syn. Aphora, 

 Argyrothamnia, in part. Perennial herbs. About 20 species, 

 temperate and tropical regions; 9 in U. S. 



698. DODECATHEON, L. Shooting-star, etc. Primiilaceae. 



From Greek, "twelve gods". An old Greek plant-name. 

 Scapose perennial herbs. About 18 species, N. America and 

 northeastern Asia; 15 in L^. S., mostly western. 



a. D. Meadia L. Pennsylvania to Georgia and west to Texas and 

 Manitoba. Shooting-star, American Cowslip, Mosquito-bells, 

 Pride of Ohio, .Indian-chief, Johnny- jump. Rooster-heads. 



694. DODONAEA, L. Dodonaea. Sapindaceae. 



Trees or shrubs. About 45 species, tropical regions, es- 

 pecially of Australia; 1 in U. S. 



695. DOELLINGERIA, Nees. White Aster. Compositae. 



Named for Th. Dollinger, botanical explorer. Syn. Diplo- 

 pappus. Aster, in part. Perennial herbs resembling Aster. 

 Four species, all of U. S. 



696. DONDIA, Adans. 1763. Bliie, Sea-Blite. Chenopodiaceae. 



Named for J. Dondi, Italian naturalist, 17th Century. Syn. 

 Suaeda, Forsk. 1775; Salsola, Chenopodium, in part. Thick- 

 leaved herbs or low shrubs. About 60 species, widely distri- 

 buted; 11 in U. S. 



