PENNELL—SCROPHULARIACEAE OF THE ROCKY MOUNTAINS. 378 
Cotorapo: Boulder: Boulder, Ramaley 9593 (B). Douglas: Larkspur, Johnston & 
Hedgecock 436 (Y). El Paso: North of Cheyenne Canyon, Bessey (Y); Colorado 
Springs; Monument Park (A, U); Palmer Lake (U); Ute Pass (M). Huerfano: 
Wahatoya Creek, Rydberg & Vreeland 5640 (P). 
70. Penstemon harbourii A. Gray. 
Penstemon harbourti A. Gray, Proc. Amer. Acad. 6: 71. 1862. ‘Rocky mountains 
of Colorado Territory, in the high alpine region, no. 396 of Hall and Harbour’s dis- 
tribution; found only by Mr. J. P. Harbour.”’ Isotype seen in herbarium of Colum- 
bia University at the New York Botanical Garden. 
Penstemon bakeri Greene, Pittonia 4: 318. 1901. ‘‘At 11,500 feet in the mountains 
about Pagosa Peak, southern Colorado, 6 Aug., 1899, C. F. Baker.’ 
Rocky slopes above timber line, especially on rock slides, at altitudes of 3,300 to 
4,100 meters; Alpine Zone; flowering from early July to early August. High moun- 
tains of Colorado, from Medicine Bow Mountains to Sangre de Cristo Range and La 
Plata Mountains. 
CoLorapo: Chaffee: Mount Princeton, Sheldon 241 (U), 553 (U, Y). Clear Creek: 
Above Berthoud Pass (M); near Georgetown (M); Grays Peak (M, U); Mount 
Flora (M); Mount McClellan, Patterson 118 (F, M, U, Y). Fremont: Sangre de 
Cristo Range, Brandegee 804 (M). Gunnison: Sheep Mountain, Purpus 607 (F). 
Larimer: Near Lulu Pass, Osterhout 603; Mount Richtophin (Y). La Plata: La 
Plata Mountains (U); Virginia Gulch, south slope of Needle Mountains, Cross 27 
(U). Ouray: Along Horsethief Trail east of Ouray, Pennell 6236 (A, B, D, F, H, 
K,M,P,R,S,U, Y). Mount Abram, Pennell 6187 (U, Y). San Miguel: Yellow 
Mountain, Ophir, J. V. Brewster (D). Summit: Mount Baldy (M); Mount 
Breckenridge, Hall & Harbour 396 (A, E, F, M). 
71. Penstemon retrorsus Payson, sp. nov. 
Stems loosely tufted, much branched below, spreading and soon ascending and 
erect, 10 to 20 cm. tall, from a very short caudex, pubescent with reflexed-spreading 
cinereous hairs; leaves light green, not veined, cinereous-pubescent, entire, the 
blades of lower leaves oblanceolate, attenuate to an ill-defined petiole, the stem leaves 
sessile, lanceolate, the largest leaves mostly 2.5 to 3.5 cm. long, 0.3 to 0.4 cm. wide; 
thyrsus narrow, com posed of 6 to 12 fascicles, each consisting of 2 axillary branches, 
each of these bearing several flowers, their pedicels usually shorter than the common 
peduncle; sepals 3 to 4 mm. long, ovate-lanceolate, acutish to acute, not ribbed, not 
Scarious-margined, densely and finely cinereous-pubescent; corolla 16 to 20 mm. 
long, the tube and throat 13 to 15 mm. long, the throat slightly inflated, flattened and 
2-ridged within ventrally, the 2 posterior lobes 2.5 to 3 mm. long, united and arched 
about two-thirds their length, projecting, the 3 anterior lobes 3 to 5 mm. long, united 
at base, spreading; corolla externally glandular-puberulent, within pubescent over 
the bases of the anterior lobes, glabrous elsewhere, blue (not seen fresh); anther sacs 
Widely divaricate, 0.6 mm. long, ovate, glabrous, distinct, with relatively long line 
of contact, opening throughout, the suture minutely ciliolate; sterile filament in- 
cluded, flat, not enlarged distally, bearded most of its length (densely distally) with 
golden-yellow hairs on the posterior face; capsule not seen. 
Type in the herbarium of the New York Botanical Garden, collected on a dry 
adobe hill near Montrose, Colorado, altitude 1,740 meters, in flower, June 15, 1915 
by Edwin Payson (no. 673). poh. 
Adobe hills, at an altitude of 1,740 meters; Upper Sonoran Zone; flowering in mid- 
June. Valley of Uncompahgre River in western Colorado. 
CoLorapo: Montrose: Montrose, R. Dawson (D); Payson 673 (Y). 
