ONAGRACEA 299 



4. GAYOPHYTUM, Adr. Juss. 



1. Gayophytum ramosissimum, Torr. & Gray. 

 Hab. Prairies of the Upper Columbia, Washington Territory. 



5. CLARKIA, Piirsh. 



1. Clarkia pulchella, Pursh. 



Hab. On the Upper Columbia and Kooskooskee Rivers ; in plains 

 and stony places ; probably the very district in which this plant was 

 discovered by Lewis and Clarke. 



2. Clarkia rhomboidea, Dough in Book 



Hab. Plains near the Cascade Mountains, Oregon. — This species 

 makes a near approach to CEnothera, section Godetia, and particularly 

 the second division of that section. The flowers are scarcely one- 

 third as large as those of G. pulchella. 



6. G A U R A, Linn. 



1. Gaura parviflora, Dough in Hook. 



Hab. On the Walla-Walla River, Oregon; a common and wide- 

 spread species ; the only one west of the Rocky Mountains. 



