224 UNIVERSITY OF MISSOURI STUDIES [372 



Order 43. CARD U ALES. 

 Family no, AMBROSIACEAE. Reich. Ragweed family. 



426. IVA L. MARSH -ELDER. 



988. I. xanthiifolia (Fresen.) Nutt. BURWEED MARSH-ELDER. 

 Common on the plains along streams, and in waste places, 



and following the larger streams several miles into the foot- 

 hills and mountains, 5100-7000 ft. (Daniels, 821). Also in 

 Sunset Canon (Rydberg). 



MICHIGAN and SASKATCHEWAN to WASHINGTON ; NEBRASKA 

 to NEW MEXICO. 



989. I. axillaris Pursh. SMALL-FLOWERED MARSH-ELDER. 



Railroads and waste places, 5100-6000 ft. (Daniels, 832). 



SASKATCHEWAN to BRITISH COLUMBIA ; OKLAHOMA to CAL- 

 IFORNIA. 



427. AMBROSIAL. RAGWEED. 



990. A. trifida L. GREAT RAGWEED. HORSE-CANE. 

 Common along streams and in low waste places, 5100-6000 



ft. (Daniels, 378). 

 QUEBEC to ASSINIBOIA; FLORIDA to COLORADO. 



99oa. A. trifida integrifola (Muhl.) T. & G. ENTIRE-LEAVED 



RAGWEED. 



With the preceding (Daniels, 596). 

 Range of the type? 



991. A. artemisiaefolia L. COMMON RAGWEED. 

 Waste places and fields, 5100-6000 ft. (Daniels, 520). 

 NOVA SCOTIA to BRITISH COLUMBIA; FLORIDA to COLORADO. 



992. A. psilostachya DC. WESTERN RAGWEED. 



On the plains, especially along railroads, 5100-6000 ft. (Dan- 

 iels, 516). Also at Lyons (Rydberg). 



MICHIGAN to SASKATCHEWAN and IDAHO; LOUISIANA to 

 CALIFORNIA and MEXICO. 



428. GAERTNEKIA Med. 



993. G. tomentosa (Nutt.) Heller [Franseria discolor Nutt.]. 



