244 UNIVERSITY OF MISSOURI STUDIES [394 



encelioides exauriculata Rob. & Greenm. ; Ximenesia 

 exauriculata (Rob. & Greenm.) Rydb.]. Western 



CROWNBEARD. 



Boulder (Rydberg). In great abundance near Lafayette 

 (Cockerell). 

 Montana to Texas and Arizona. 



460. BIDENS L. Bur-marigold. 



1 1 22. B. vulgata Greene. Common sticktights. 



Along ditches and in low grounds, 5100-5500 ft. (Daniels, 

 788). 



Ontario to British Columbia ; North Carolina to Cali- 

 fornia. 



1123. B .glaueesens Greene. Glaucescent bur-marigold. 

 Along ditches and streams and in swales, 5100-5500 ft. (Dan- 

 iels, 667). Hardly glaucescent as it occurs about Boulder. 



Saskatchewan to Montana ; Kansas to Colorado. 



1123^. B. tenuisecta Gray. Western Spanish needles. 

 Marshall lake (W. W. Robbins). 

 Colorado to Idaho ; Texas to Arizona and Mexico. 



461. THELESPERMA Less. 



1 124. T. gracile Gray. Slender Thelesperma. 

 Common on the plains and mesas, and occurring also on the 



open mountain slopes, 5100-9000 ft. (Daniels, 233). Also 

 between Sunshine and Ward (Rydberg). 



Nebraska to Colorado ; Missouri and Texas to Arizona. 



462. PICRADENIOPSIS Rydb. 



1 125. P. oppositifolia (Nutt.) Rydb. [Balu'a oppositifolia 

 Nutt.]. Opposite-leaved Bahia. 



Boulder (Rydberg). 



South Dakota to Montana; Texas to Arizona. 



463. BAHIA Lag. 



1 126. B. dissecta (Gray) Britton [B. chrysanthemoides Gray]. 

 Fine-leaved Bahia. 



Infrequent along canons, 6000-9000 ft. (Daniels, 719). Also 



