220 LINACEAE. 



3. Linum aristatum Engelm. In arid places from Colo, and Utah to Tex. 

 and Ariz. " Colorado " ; exact locality not given. 



4. Linum australe Heller. On dry plains and hills from Colo, to N. M. 

 and Ariz. ; also Mex. Alt. 4000-8000 ft. Arboles ; La Veta ; Mancos Canon ; 

 Dixon Canon ; Durango. 



5. Linum rigidum Pursh. On dry plains and hills from Sask. and Alb. to 

 Mo. and Colo. Alt. 4000-7000 ft. Livermore, Larimer Co. ; foot-hills western 

 Larimer Co. ; Dillon ; Durango. 



6. Linum puberulum (Engelm.) Heller. (L. rigidum pubendiim Engelm.) 

 On dry plains and hills from Colo, and Nev. to Tex. and Calif.- Alt. 4000- 

 6000 ft. Grand Junction ; Walsenburg. 



7. Linum arkansanum Osterh. Sandy soil from Neb. and Colo, to Kans. 

 and Tex. Rocky Fork, Otero Co. 



Family 74. OXALIDACEAE Lindl. WOOD-SORREL FAMILY. 



Plants acaulescent, perennial with bulb-like rootstock; corolla rose-violet, 



i. IONOXALIS. 



Plants caulescent, not succulent, annuals or perennials with slender rootstock ; 

 corolla yellow. 2. XANTHOXALIS. 



i. IONOXALIS Small. VIOLET WOOD-SORREL. 



i. lonoxalis violacea (L.) Small. (Oxalis z'iolacea L.) On prairies and in 

 valleys from New England and Minn, to Fla. and Colo. Glen Eyrie. 



2. XANTHOXALIS Small. YELLOW WOOD-SORREL, SOURGRASS. 



Inflorescence umbellike ; pods pubescent. i. X. stricta. 



Inflorescence dichotomous-cymose ; pods glabrous. 2. X. coloradensis. 



1. Xantoxalis stricta (L.) Small. (Oxalis stricta L.) In woods, culti- 

 vated soil and roadsides, from N. S. and S. D. to Fla., Tex. and Colo. Alt. 

 4000-8000 ft. Boulder; Pagosa Springs; foot-hills, Larimer Co.; gulch west 

 of Pennock's ; mountains northeast of Dolores ; Howe's Gulch ; Redstone ; 

 Horsetooth Gulch. 



2. Xantoxalis coloradensis Rydb. In gulches and in river valleys of Colo, 

 and Black Hills of S. D. Alt 5000-9000 ft. Gulch in foot-hills, Larimer Co. ; 

 Sangre de Cristo Creek ; New Windsor, Weld Co. ; along Poudre ; Redstone ; 

 Ft. Collins ; Mason's river-front farm. 



Family 75. ZYGOPHYLLACEAE Lindl. CALTROP FAMILY. 



Herbs; albumen none; fruit not villous ; carpels 10-12. i. KALSTROEMIA. 



Shrubs ; albumen horny ; fruit villous ; carpels 5. 2. COVILLEA. 



i. .KALSTROEMIA Scop. 



Sepals lanceolate, appressed-pubescent. i. AT. maxima. 



Sepals linear-subulate, bristly hirsute. 2. K. hirsntissima. 



i. Kalstroemia maxima (L.) T. & G. (T rib id us ina.riiiius L.) Waste 

 places and sandy soil in the Gulf States. Rocky Ford. 



