124 ALLIONIACEAE. 



Leaves erect or ascending; lobes of the involucre rounded or broadly 



triangular-ovate. 

 Plant prostrate or diffuse ; involucres and branches of the inflorescence 



densely viscid hairy. 5. A. diffusa. 



Plants more simple, erect or ascending ; branches of the inflorescence 



usually merely viscid-puberulent. 



Leaves from ovate or obovate to linear-lanceolate, usually over 5 

 mm. wide. 6. A. lanceolata. 



Leaves narrowly linear, less than 5 mm. wide. 7. A. linearis. 



Leaves divergent ; lobes of the involucre elliptic or oval. 



8. A. divaricata. 



Involucres on solitary axillary peduncles, rarely also in small dense terminal 

 clusters. 9. A. Bodinil. 



1. Allionia myctaginia Michx. (Oxybaphus myctaginius Sweet) In 

 alluvial soil from 111. to Sask., Mo. and Colo. Alt. 4000-5000 ft Denver; 

 Ft. Collins; buttes along Poudre River, near Ft. Collins. 



2. Allionia hirsuta Pursh. On plains and sandy valleys from Minn, to S. 

 D., Nebr. and Colo. Alt. 4000-7000 ft. Cheyenne Mountain; Manitou; Colo- 

 rado Springs; Cucharas Valley, near La Veta; North Cheyenne Canon; 

 Colorado Springs; Englemann Canon; vicinity of Ft. Collins. 



3. Allionia pilosa (Nutt.) Rydb. In dry and sandy soil from Wis. to Sask., 

 La. and Tex. Alt. 4000-7000 ft New Windsor, Weld Co. ; La Veta. 



4. Allionia sessilifolia Osterhout. Plains of Colo. Livermore. 



5. Allionia diffusa Heller. In sandy soil and on plains from N. D. to Wyo., 

 Kans. and Ariz. Alt. 4000-9000 ft. Minnehaha ; Piedra ; Ft. Collins ; Pueblo ; 

 Horsetooth Gulch; Table Rock; Hotchkiss; above Rustic; Grand Junction. 



6. Allionia lanceolata Rydb. On plains and prairies and in dry sandy soil 

 from Minn, to Wyo., Tenn., Tex. and Colo. Alt. 5000-7000 ft. Estes Park, 

 Larimer Co. ; Canon City ; New Windsor, Weld Co. ; vicinity of Ft. Collins. 



7. Allionia linearis Pursh. (Oxybaphus angustifolius Sweet.) On dry 

 plains from Minn, to Mont., La. and Ariz. ; also in Mex. Alt. 4000-9000 ft. 

 Grand Canon of Arkansas ; Platte River, Denver ; Grand Junction ; southeast 

 of Ouray; Parlin, Gunnison, Co. 



8. Allionia divaricata Rydb. In sandy valleys from Colo, to N. M. and 

 Ariz. Durango. 



9. Allionia Bodinii (Holz.) Morong. (Oxybaphus Bodinii Holz.) On dry 

 mesas from Colo, to Utah and Tex. Alt. 4000-6000 ft. Pueblo ; Ft. Collins. 



5. WEDELIA Loeffl. 



i. Wedelia incarnata L. In valleys from Colo, to Tex. and Ariz.; also 

 Mexico and Tropical America. Canon City (Greene). 



Family 49. TETRAGONIACEAE Reichenb. CARPET-WEED FAMILY. 



i. SESSUVIUM L. SEA-PURSLANE. 



i. Sessuvium sessile Pers. On saline plains from Kans. to Nev., Tex. and 

 Calif.; also Mex. Alt. about 8000 ft. Alamosa. 



