Av dil 
PENNELL—SCROPHULARIACEAE OF THE ROCKY MOUNTAINS. 3869 
tion, no. 6516 being the type.”’ Isotype seen in herbarium of New York Botanical 
Garden. 
Penstemon procerus pseudoprocerus A. Nels. in Coulter, New Man. Rocky Mount. 
444, 1909. 
Varies in the length of tip and laceration of the sepals, the type having a short 
tip and more lacerate, broad, scarious margin, nearly the opposite extreme being 
P. pseudohumilis. 
Open rocky hillsides, at altitudes of 1,900 to 2,700 (3,150) meters; Montane and 
Submontane zones; flowering from late June to mid-August. Mountain slopes, 
extending southward in the Bighorn and Teton ranges; southern Montana, northern 
Wyoming, southern Idaho, and eastern Oregon. 
Wyomina: Bighorn: Worthly 96 (U). Fremont: Upper Buffalo to head of Du Noir 
River, C. C. Curtis (Y). Lincoln: Sheep Mountain, Tweedy 230 (Y); Teton 
Mountains, 4. & E. Nelson 6516 (M, Y). Sheridan: Headwaters of Tongue 
River, Tweedy 46 (Y). Yellowstone National Park: Devils Cut (U); Electric 
Peak (F, U); Hedges Peak, Pennell 6021 (Y); Mammoth Hot Springs, Pennell 
6035 (A, D, H, K, M, P, R, 8, Y); Whirlwind Peak, Cary 589 (U). 
Ipano: Fremont: Beaver Canyon (Y); Mount Chauvet, Rydberg & Bessey 4915 
Y). 
(@, ¥) 63. Penstemon virens Pennell. 
Penstemon virens Pennell; Rydb. Fl. Rocky Mts. 773, 1066. 1917. “Type: 
Stony hillsides, foothills north of Morrison, Colo., 1915, Pennell 5821 (N. Y.).”’ 
Type seen in herbarium of the New York Botanical Garden. 
Stems several to many, slightly decumbent at base, erect, 15 to 45 cm. tall, from 
much-branched rootstocks, slender, puberulent in lines, loosely glandular-pubescent 
above, green; leaves thin, green, dull to rather lustrous, obscurely veined, glabrous, 
those at the base of the stem much tufted, the blades lanceolate, acute, entire or rarely 
sparingly and slightly serrate, altogether 6 to 9 cm. long, narrowed into a petiole-like 
base nearly equaling to slightly exceeding the length of blade, the stem leaves lance- 
olate, acute, somewhat clasping, entire or serrulate-dentate above, the largest 3 to 7 cm. 
long, 0.5 to 1.2 cm. wide; thyrsus narrow, not secund, one-third to one-half the height 
of the plant, composed of 3 to 9 loose fascicles, each consisting of 2 axillary ascending 
branches, their pedicels shorter than the peduncle; sepals 3 to 4 mm. long, ovate, 
acuminate, slightly veined, with whitish, scarious, nearly entire margins, loosely 
glandular-pubescent; corolla 15 to 18 mm. long, the tube and throat 11 to 13 mm. 
long, the throat 3 to 4.5 mm. wide, inflated, but slightly flattened and 2-grooved 
anteriorly, the 2 posterior lobes 5 to 6 mm. long, united and arched one-third their 
length, with free recurved erect lobes, the 3 anterior lobes 5 to 6 mm. long, united 
proximally, the free lobes spreading; corolla externally glandular-pubescent, within 
slightly lanose-pubescent with whitish hairs over the bases of the anterior lobes, blue, 
more violet on throat and when young, paler within and slightly paler without, the 
throat anteriorly veined within with red-purple lines, these more evident on the ante- 
rior lobes; anther sacs widely divaricate, 0.7 to 0.8 mm. long, broadly ovate, distinct, 
opening throughout, glabrous, dark gray-blue; sterile filament nearly or quite equal- 
ing the anterior ones, not or slightly wider distally, densely bearded distally with 
yellow hairs; capsule 6 to 7 mm. long, ovate, acuminate, glabrous, greenish brown; 
seeds 1 to 1.2 mm. long, irregularly angular in outline, scarcely curved, the angles 
sharp, not winged, the surface reticular, dull dark gray or brownish gray, not pale 
toward margin. 
Rocky, wooded slopes, at altitudes of 1,600 to 3,000 meters. Submontane and 
Montane zones: flowering from late May to early August. Foothills, eastern slope 
of Medicine Bow Range, southeastern Wyoming, to Culebra Range, southeastern 
Colorado; common through middle areas; also west of Medicine Bow Mountains in 
