1921] NATURAL SCIENCES OF PHILADELPHIA. 497 



Louisiana. Acadia: Crowley, Cocks (L). Caddo: Shreveport, 

 Cocks 3612 (L, Y). Calcasieu: DeQuincy, Pennell 10228 (L, T, 

 U, Y); Lake Charles, Pennell 10220 (Y). Jeff Davis: Jennings, 

 Pennell 10206 (A, C, H, J, K, L, M, S, U, Y). Natchitoches: 

 Natchitoches, E. J. Palmer 7305 (M). Rapides: Alexandria, 

 Hale (U). 



Texas. Austin: Bellville, Pennell 10301 (T, Y). Brazoria: 

 Alvin, Young 257 (T). Burnet: Fairland, Pennell 10478 (Y). 

 Dallas: Dallas, Reverchon 694 (M). Fayette: Colony, Crawford 

 (M). Guadalupe: Kingsbury, E. J. Palmer 11643 (M). Hardin: 

 Fletcher, E. J. Palmer 9549 (M). Harris: Harrisburg, Pennell 

 10250 (Y); Houston. Hays: San Marcos, Stanfield (Y). Hood: 

 Granbury, Eggert (M). Jackson: Ganado, E. J. Palmer 9241 (M). 

 Liberty: Dolen, Young (T). Milam: Milano, E. J. Palmer 11775 

 (M). Orange: Orange, Bray 56 (U). Polk: Livingston, E. J. 

 Palmer 5212 (M). San Augustine: San Augustine, Crocket (U). 

 Smith: Troup, Young (T). Tarrant: Handley, Ruth 462 (U). 

 Travis: Austin, Pennell 10443 (Y). Victoria: Mission Valley, 

 Schott (Y). Walker: Huntsville, Young (T). 



17. Penstemon ambiguus Torr. 



F'enstemon ambiguus Torr., in Ann. Lye. N. Y. 2:228. 1828. "Hab. Near the 

 Rocky Mountains [E. P. James in 1820]." Type collected by Edwin 

 James either in eastern Colorado, northeastern New Mexico or north- 

 western Texas, seen in Herb, of Columbia University at the New York 

 Botanical Garden. 



Leiostemon purpureus Raf., Atl. Jour. 1 : 14.5. 18.32. Based upon Penstemon 

 ambiguus Torr. 



Sandy or rocky prairies, mostly near streams; plains north of 

 Canadian River in extreme northwestern Texas; in the Wichita 

 Mountains, southwestern Oklahoma; and in the western Callahan 

 Divide, west-central Texas; doubtless elsewhere in upland Texas; 

 Upper Sonoran Zone (at altitudes above 2,400 feet). High plains, 

 westward to southwestern Utah and Chihuahua. Flowering from 

 May to August. 



Oklahoma. Comanche: Wichita Mts., Marcy (Y). 



Texas. Dallam; Texline, Howell 138 (U). Hartley: Channing, 

 E. J. Palmer 14157 (M). Howard: Big Springs, Tracy 7995 (M, T, 

 Y). Martin: Stanton, Eggert (M). Ward: Monahans, Clawson 

 13909 (U). 



