31 i] FLORA OF BOULDER, COLORADO 1 63 



Nova Scotia to British Columbia ; New York to Cali- 

 fornia. 



264. ERODIuH L. Stork's-bill. 



659. E. cicutarium (L.) L'Her. Hemlock stork's-bill. 

 Pin-clover. 



Boulder (Rydberg), where it is very common (Cockerell). 

 Europe, thence to North America. 



Family 63. LINACEAE Dumont. Flax family. 



265. LINITM L. Flax. 



660. L. Lewisii Pursh [L. perenne Lewisii (Pursh) Eat. & 

 Wright] . Lewis's flax. 



Abundant on the plains, mesas, and open mountain slopes, 

 5100-8600 ft. (Daniels, 132). 



Mackenzie to Yukon ; Texas to California and Mexico. 



661. L. pratense (Norton) Small. Meadow flax. 

 Abundant in a meadow north of Boulder (Henderson & 



Cockerell). 



Range of the preceding. 



Family 64. OXALIDACEAE Lindl. Wood sorrel family. 



266. XANTHOXALIS Small. Yellow wood sorrel. 



662. X. stricta (L.) Small [Oxalis strict a L.] Upright yel- 

 low wood sorrel. 



Common throughout except at the higher elevations, espe- 

 cially along roads and railroads, and in yards about houses, 

 5100-8000 ft. (Daniels, 572). 



Nova Scotia to South Dakota; Florida to Texas and 

 Colorado : adventitious in Europe. 



Order 25. EUPHORBIALES. 

 Family 65. EUPHORBIACEAE St. Hil. Spurge family. 



267. CROTON L. Croton. 



663. C. Texensis (Klotzsch) Muell. Arg. Texas croton. 

 Longmont and Boulder (Rydberg). 



Illinois to Wyoming; Alasama to Arizona and Mexico. 



