490 PROCEEDINGS OF THE ACADEMY OF [PaRT III 



Black or red loam, usually calcareous, central and western prairies 

 of Oklahoma, on Abilene and Lampasas plains, Grand and espec- 

 ially the Black Prairie, south to Bexar County, central Texas; also 

 in post-oak woods eastward in Waller County; Austroriparian and 

 Lower Sonoran Zones (at altitudes of 300 to 2,000 feet). Central 

 Plains of Oklahoma and Texas, south to Bexar County. Ranges 

 north to Kansas, and, including the following variety, into the 

 Ozark Mountains of southern Missouri and Arkansas. 



Oklahoma. Cleveland: Norman, Emig 485 (M). Custer: 

 Weatherford, Pennell 10572 (A, C, H, J, K, L, M, O, P, S, T, U, Y). 

 Woods: Cora, Stevens 539 (M, U). ' 



Texas. Bexar: San Antonio, Thurber (Y). Comal: New 

 Braunfels, Pilsbry (A). Comanche: Comanche, Eggert (M). 

 Dallas: Dallas, Pennell 5402 (P, Y). Grayson: Denison, Letter- 

 man (M); Sherman. Hays: San Marcos, Stanfield (Y). Hood: 

 Granbury, Eggert (M). Kaufman: Terrell, Tyler (U). Mc- 

 Lennan: Waco, Griffith (Y). Medina: Hondo, Pilsbry (A). San 



Augustine : San Augustine, Leavenworth (A) . Shackelford : , Hol- 



stein. Tarrant: Fort Worth, Ruth 101 (M, U, Y). Taylor: 

 Buffalo Gap, Havard (U). Travis: Austin, Pennell 10448 (U, Y). 

 Waller: Hempstead Hall 408 (M U Y). Wichita: Burkburnett 

 Tharp 522 (Y). 



9a. Penstemon cobaea purpureus Pennell, var. nov. 



Corolla 38-43 mm. long, less inflated, violet-purple and with dark 

 violet lines; evidently glandular-pubescent within. Plant 10-12 dm. 

 tall. Leaves usually longer, 10-15 cm. long, dark green. 



Type, limestone cliffs, Renters Bluff, Izard Co., Arkansas, collect- 

 ed in flower June 1, 1920, F. W. Pennell 10681, in the Herbarium 

 of the New York Botanical Garden. 



Here considered as a geographic variety of the prairie species, 

 Penstemon cobaea, but further field-study is needed to decide their 

 mutual status. A strikingly distinct plant, when contrasted 

 alive with the paler-flowered species, but specimens of the latter 

 show great range of variation in most features. Flowering in 

 May and June. 



Rocky calcareous barrens arid cliffs, Ozark Mountains of northern 

 Arkansas and southern Missouri. 



Arkansas. Izard: Renters Bluff, Pennell 10681 (A, C, H, K, 

 L, M, 0, T, U, Y). Marion: Cotter, E. J. Palmer 14320 (M). 



