PENNELL—SCROPHULARIACEAE OF THE ROCKY MOUNTAINS. 363 
52. Penstemon cyathophorus' Rydb. 
Penstemon cyathophorus Rydb. Bull. Torrey Club 81: 643.1905. ‘Colorado: Pearl, 
1901, Tweedy 4307 (type).’’? Type seen in herbarium of the New York Botanical 
Garden. 
“Meadows,” ‘‘sagebrush”, at altitudes of 2,400 to 2,600 meters; probably Montane 
Zone; flowering from early June to late July. Middle and North Park, northern 
Colorado and adjacent southeastern Wyoming. 
Wyomina: Carbon: ‘‘Hiltons” (‘‘North Park in edge of Wyoming”), Osterhout 986. 
Cotorapo: Grand: Sulphur Springs, Clements (Y), Osterhout,2975, 3255. Jackson: 
Grizzly Creek (Y); Pearl, Tweedy 4307 (U, Y). 
53. Penstemon coloradoensis A. Nels. 
Penstemon coloradoensis A. Nels. Bull. Torrey Club 26; 355. 1899. ‘‘Of this 
species I have before me specimens from two collections made near Mancos, Colorado, 
by Messrs. Baker, Earle and Tracy, 1898, and distributed as P. caespitosus Nutt.” 
Type (no. 70, collected in flower June 23, 1898) seen in the Rocky Mountain Herba- 
rium. The second collection referred to (no. 27, collected in flower June 21, 1898) is P. 
zylus A. Nels. 
Sagebrush plains, at altitudes of 900 to 2,100 meters; Upper Sonoran Zone; flower- 
ing from mid-June to early July. San Juan Valley of southwestern Colorado to south- 
ern Utah, northwestern New Mexico, and northern Arizona. 
CoLorapo: La Plata: Durango, Crandall 1826 (B, F, R, U, Y). Montezuma: Dolores 
(Y); Mancos, Baker, Earle & Tracy 70 (F, M, R, U, Y). 
Urauw: Washington: Pine Valley (U.S. Forest Service Herb.); St. George, Palmer (Y). 
63a. Penstemon coloradoensis sileri (A. Gray) Pennell. 
Penstemon linarioides sileri A. Gray, Syn. Fl. 2!: 270. 1870. ‘‘S. Utah, Siler.” 
Probable isotype, from Osmer, Siler 90, seen in herbarium of the Missouri Botanical 
Garden. 
Probably only a form of P. coloradoensis. 
Southern Utah; flowering from middle to late June. 
Uran: Kane: Sink Valley, Jones (M, U). 
54. Penstemon exilifolius A. Nels. 
Penstemon exilifolius A. Nels. Bull. Torrey Club 28: 230. 1901. ‘The latter 
[A. Nelson 7460] is taken as the type and is from Halleck Cafion [Wyoming], July 6, 
1900.’ Isotype seen in herbarium of the New York Botanical Garden. 
Dry, stony plateaus and hillsides, at altitudes of 2,200 to 2,700 meters; probably 
Montane Zone; flowering from early July to early August. Southeastern Wyoming 
and northeastern Colorado. 
Wyomine: Albany: Cummins (R); Halleck Canyon, Nelson 7460 (B, M, U, Y); 
Laramie Hills, E. Nelson 52 (Y); Laramie Plains, Nelson 419 (M, U, Y); Red 
Buttes; Sheep Mountain, Goodding 2086 (U, Y); near Upper Laramie River, 
Frémont 2nd Exped. 533 (Y); west of Sherman (M). 
Cotoravo: Larimer: Medicine Bow Mountains, Crandall (Y). 
55. Penstemon laricifolius Hook. & Arn. 
Penstemon laricifolius Hook. & Arn. Bot. Beech. Voy. 376.1841. ‘‘Hab. Snake 
Fort, Snake Country, [a friend of] Mr. Tolmie.”” Isotype, labeled ‘Snake Country,”’ 
and probably from southeastern Idaho, seen in herbarium of Columbia University 
at New York Botanical Garden. 
