PENNELL—SCROPHULARIACEAE OF THE ROCKY MOUNTAINS. 345 
Harbour: no. 388, distrib. Hall and Harbour.’’ Isotypes seen in herbaria of the 
Academy of Natural Sciences of Philadelphia, Field Museum of Natural History, 
Missouri Botanical Garden, and Brooklyn Botanic Garden. 
Rocky knolls, above timber line, at altitudes of 3,100 to 3,900 meters; Alpine 
Zone; flowering from early July to late August. High mountains, Front Range 
from Grays Peak southward, Sawatch Range, Pikes Peak, Sangre de Cristo Range, 
and San Juan and adjacent ranges, Colorado. 
Cotorapo: Chaffee: Mount Princeton, Sheldon 549 (U). Clear Creek: Grays Peak, 
Patterson 119 (F, M, U, Y); Mount McClellan (F). El Paso: Mount Garfield (Y); 
Pikes Peak, Pennell 6328 (D, R, Y). Lake: Mount Elbert, W. A. Henry (U). 
Park: Mountains north of Boreas (U); mountains above Como (Y); Horseshoe 
Mountain, Coulter (U, Y). San Juan: Engineer Mountain (F); Mineral Point 
(M); Needle Mountains (U); Silverton, Tweedy 167 (U). Summit: Argentine 
Pass, Jones 408 (B, Y). County uncertain: Sangre de Cristo Range, Brandegee 
805 (M). 
21. Penstemon parvus Pennell, sp. nov. 
Stems several, 5 to 10 cm. tall, from a relatively long slender caudex, slender, 
puberulent, not glandular or glaucous; leaves green, not glaucous, obscurely veined, 
puberulent, those at the base of the stem with oblanceolate-obovate acutish blades, 
2 to 2.5 cm. long and 4 to 5 mm. wide, narrowed into ill-defined petiole-like bases, 
those of the stem similar, smaller, with narrowed, slightly clasping base, becoming 
much reduced in the inflorescence; thyrsus narrow, probably secund, raceme-like, 
not over one-fourth the height of the plant, composed of 1 or 2 fascicles, each con- 
sisting of 1 or 2 axillary one-flowered branches (the flowers but 1 to 4); sepals 4 mm. 
long, ovate, acute, not veined, not or scarcely scarious-margined and erose-margined, 
sparsely and finely glandular-puberulent; corolla 20 mm. long, the tube and throat 
14 mm. long, the tube narrow, the throat inflated and rounded ventrally, the 2 poste- 
rior lobes 6 mm. long, united and arched over one-half their length, probably pro- 
jecting, the 3 anterior lobes slightly shorter, united at base, the free portions spread- 
jng; corolla externally glandular-puberulent, within glabrous, blue (not seen fresh); 
anther sacs widely divaricate, 1 mm. long, lance-ovate, distinct, opening from distal 
apex throughout, glabrous; sterile filament about equaling the anterior pair, slightly 
enlarging distally, glabrous; capsule not seen. 
Type in the U. 8. National Herbarium, no. 146868 (in part), collected at The 
Button, Aquarius Plateau (Garfield or Wayne County), Utah, altitude 3,400 to 3,500 
meters, in flower, August 11, 1875, by L. F. Ward (no. 546); distributed as P. acumt- 
natus Dougl. 
Alpine Zone. ; 
22. Penstemon unilateralis Rydb. 
Penstemon unilateralis Rydb. Bull. Torrey Club 33: 150. 1906. Based upon ‘‘P,. 
secundiflorus A. Gray, Syn. Fl. 21: 263. 1878. Not P. secundiflorus Benth.” State- 
ment of type locality from Gray: ‘‘Mountains of Colorado, common at 8 or 9,000 
feet.”’ Specimens named by Gray seen; none designated as type, but name suffi- 
ciently definite. 
Usually in gravelly soil, on hillsides and along streams, at altitudes of 1,400 to 2,800 
(3,000) meters; Submontane and Montane zones; flowering from mid-June to late 
August. Foothills and lower slopes of mountains, descending usually along rivers 
into high plains northward, from southeastern Wyoming to southern Colorado, on 
both continental slopes. 
Wyvomine: Laramie: Cheyenne, Nelson 1997 (M). 
Cotoravo: Arapahoe: Littleton, Eggleston 11213 (U). Boulder: Boulder, Pennell 
5845 (Y); Coal Creek; Eldorado Springs; Lyons (M); Sulphide (B, Y). Chaffee: 
Buena Vista, Sheldon (U, Y, Z); Granite (U); Mount Harvard (Y). Clear Creek: 
