128 UNIVERSITY OF MISSOURI STUDIES [2/6 



185. BURSA Weber. Shepherd's purse. 



462. B. Bursa-pastoris (L.) Weber [Capsella Bursa- past oris 

 (L.) Medic.]. Common shepherd's purse. 



Very common in fields and waste places, 5100-9000 ft. (Dan- 

 iels, 252). 



Europe, thence now cosmopolitan. 



186. PHYSAKIA Gray. Double bladder pod. 



463. P. didymocarpa (Hook.) Gray. Common double blad- 

 der pod. 



Common under rocks in the mesas and foothills, 5700-7000 

 ft. (Daniels, 80). Also Long's Peak (Porter & Coulter; Coul- 

 ter in Wabash College Herb.). 



Saskatchewan to Alberta; Colorado to Utah. 



464. P. floribunda Rydb. Many-flowered double bladder 

 pod. 



Plains and foothills near Boulder; Eldora to Baltimore, 

 (Rydberg). Also Boulder (Mrs. T. D. A. Cockerell). 

 Colorado. 



187. LESQUERELLA S. Wats. Bladder pod. 



465. L. Shearis Rydb. Shear's bladder pod. 



On shales with thin soil between Marshall and South Boul- 

 der Peaks, 5400-6000 ft. (Daniels, 436). Plains and foothills 

 at Boulder (Rydberg). 



Colorado. 



188. CAMELINA Crantz. Myagrum. 



466. C. sativa (L.) Crantz [Myagrum sativum L.]. False 

 flax. 



Along streets and in waste places in the city of Boulder, 

 5300-5700 ft. (Daniels, 281). Not in Rydberg's Flora. 

 Europe, thence to North America. 



189. NASTURTIUM R. Br. Cress. 



467. N. Nasturtium — aquaticum (L.) Karst. [N. officinale R. 

 Br.; Roripa Nasturtium (L.) Rusby.]. Water cress. 



