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 Cafion; 

 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 puberuUim 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. lONOXALIS. 



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

 corolla yellow. 2. Xanthoxalis. 



I. lONOXALIS Small. Violet Wood-sorrel. 



I. lonoxalis violacea (L.) Small. (Oxalis violacea 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. striata. 



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.; gnlch 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. K. maxima. 



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



I. Kalstroemia maxima (L.) T. & G. (Tribulns maximus L.) Waste 

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



