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- ■^' 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. Bodinii. 



I. AlUonia myctaginia Michx. {Oxyhaphus 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. 



z. 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 Wye, 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. {Oxyhaphus angustif alius Sweet.) On dry 

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

 Grand Caiion 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. {Oxyhaphus 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. 



1. Sessuvinm sessile Pers. On saline plains from Kans. to Nev., Tex. and 

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



