362 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
Ramaley 10497 (B). Larimer: ‘‘The Glades,’’ Pennell 5865 (Y); Fossil Creek (B); 
Livermore (B); Owl Canyon, Pennell 5869 (Y); Red Mountain, (B); Ten-mile 
Creek (B). Las Animas: Stonewall, Beckwith 165 (Y); Trinidad (Y). Lincoln: 
Hugo, C. D. Marsh (U; approaching P. angustifolius caudatus). Sedgwick: Jules- 
burg, Pennell 6399 (R, U, Y). Weld: Crow Creek (U); Evans (Y); Greeley (Y); 
Pawnee Buttes (B); Peckham (M); Windsor, Pennell 5848 (M, Y), 5849 (Y). 
49a. Penstemon angustifolius caudatus (Heller) Rydb. 
Penstemon caudatus Heller, Minn. Bot. Stud. 2: 34. 1898. ‘‘The type is our no. 
3580, collected May 26, 1897, at Barranca, Taos County [New Mexico], altitude 
6,900 feet. It is very abundant in open grassy, sandy soil, about Barranca station, 
wing in large patches.’’ Probable isotype, Heller 3581, seen in herbarium of the 
New York Botanical Garden. 
Penstemon angustifolius caudatus Rydb. Bull. Torrey Club 33: 151. 1906. 
Prairies, at altitudes of 1,000 to 2,300 meters; Upper Sonoran Zone; flowering from 
mid-May to early June. High plains, valley of the Arkansas River in southeastern 
Colorado and in western Kansas, to Taos County, northern New Mexico. Variable 
and very inconstantly distinguished; perhaps a robust form, rather than a geographical 
subspecies of P. angustifolius. 
Kansas: Wallace: Wallace, W. A. Kellerman (U, Y). 
Cotorapo: Bent: Rule Creek, Osterhout 4869. El Paso: Colorado Springs, Eggleston 
11155 (U). Fremont: Canon City, Pennell 6311 (H, R, U, Y). Huerfano: 
Near La Veta, Rydberg & Vreeland 5642 (Y), 5643 (Y), 5644 (Y), 5645 (Y); Ojo 
(Y); Walsenburg (Y). Las Animas: Lay Rusby (Y). Otero: La Junta, 
Osterhout 3963. Prowers: 25 miles south of Lamar, Osterhout 5071. Pueblo: 
Beulah (B, R); Pueblo, Pennell 5738 (Y), 6314 (D, F, M, Y). Yuma: Wray, 
Osterhout 5257. 
50. Penstemon arenicola A. Nels. 
Penstemon arenicola A. Nels. Bull. Torrey Club 25: 280. 1898. ‘‘Abundant in the 
sand dunes in the hill region of the Red Desert, near Point of Rocks [Wyoming]. 
Collected June 1, 1897. * * * Type specimen in herb. University of Wyoming, 
no. 3090.’ Isotype seen in herbarium of Columbia University at the New York 
Botanical Garden. 
Sandy hills and plains, at altitudes of 1,900 to 2,100 meters; Upper Sonoran Zone; 
flowering from early to middle June. Red Desert of southwestern Wyoming. 
Wyomine: Sweetwater: Point of Rocks, Nelson 3090 (M, Y), Pennell 5889 (D, F, P, U, 
Y); 15 miles north of Point of Rocks, Merrill & Wilcox 693 (U); southeast of 
Red Desert, Pennell 5881 (H, M, R, Y); Steamboat Mountain, Nelson 7050 (R). 
Uinta: Carter (R); Fort Bridger, Nelson 4598 (R); Henrys Fork (R). 
51. Penstemon nitidus Dougl. 
Penstemon nitidus Dougl.; Benth. in DC. Prodr. 10: 323. 1846. ‘‘In collibus siccis 
ad flumina Saskatchawan, Assinaboin et Red River (Douglas! Richardson!) * * * 
(v. s.).”’. Type not seen or verified. 
iries, at an altitude of 1,500 meters; Subboreal Zone; flowering in June. High 
plains, entering northern Wyoming in valley of Tongue River. Manitoba to Alberta 
and northern Wyoming. 
Wyromne: Sheridan: Jackson Creek (R); Little Goose Grade, Nelson 2333, in part 
(M); Tweedy 47 (Y), 2332 (Y), 3417 (Y). Sweetwater: South Butte, “Thirteen 
Mile,” Nelson 3554 (R). 
