PENNELL—SCROPHULARIACEAE OF THE ROCKY MOUNTAINS. 329 
VIII. SPECTABILES. 
19. P. palmeri. 
A single species 
IX. GLABRI. 
Anther sacs glabrous (or in P. hallii sometimes with a small tuft of hairs precisely 
at the summit of the filament). 
Anther sacs with relatively long line of contact, opening throughou 
Corolla throat abruptly inflated and decurved at base; sterile Eien short- 
bearded (very rarely glabrous); anther sacs with relatively long line of con- 
tact; sepals glandular-puberulent externally, with broad lacerate scarious 
margin. Plants 5 to 25 cm. tall ‘ 
Corolla throat gradually much expanded from the base, not abruptly docusvads 
sterile filament glabrous (very rarely with a few hairs at apex); anther sacs 
— short line of contact; sepals glabrous externally, with or without a 
scarious margin. 
evhal 5 to 10 cm. tall, puberulent; basal leaves 2 to 2.5 cm. long; stem leaves 
few; thyrsus of 1 or 2 1-flowered fascicles; sepals ovate, met or scarcely 
scarious-margined; corolla glabrous within P. parvus. 
Plants 40 to 90 cm. tall, glabrous; basal leaves 6 to 12 cm. asi stem leaves 
numerous; thyrsus of many saveral-flowered fascicles; sepals oblong-ovate, 
slightly scarious-margined; corolla glabrous or sparsely pubescent within 
anteriorly. . .. 22 unilate: 
Anther sacs scarcely contiguons,t * line of contact very short. 
Anther sacs opening throughou 
Sepals narrowly ovate, more or less caudate-tipped, conspicuously scarious- 
mareined, glabrous externally; lower stem leaves sop oblanceolate, 
sometimes 12 cm. long 23. P. magnus. 
Sepals lanceolate-acuminate, not or obscurely scarious-margined, glandular- 
puberulent externally; lower stem leaves lanceolate, tapering distally, 4 to 
10 cm. long 24. P, leiophyllus. 
Anther sacs opening partially 
Plants 40 to 70 cm. tall, iekcaes throughout; sepals broadly ovate, more or 
less abruptly acuminate; corolla glabrous externally, the throat more 
inflated anteriorly; sterile filament slightly bearded -..... 25. P. laevis.! 
Plants 20 to 35 cm. tall, cinereous-puberulent throughout; sepals ovate-acumi- 
nate; corolla glandular-puberulent externally, the ssa o less inflated 
anteriorly; sterile filament glabrous P. wardii. 
Anther sacs hispid-pubescent to lanate on tlie sides, scarcely aoe the line of 
contact of the sacs very short 
Anther sacs short-pubescent with relatively stiff hairs. 
Anther sacs opening throughout. 
Corolla 25 to 30 mm. long, the throat much inflated anteriorly and slightly 
narrowed to the orifice, the anterior lobes abruptly deflexed-spreading and 
pubescent or glabrous at base within; sepals not glandular-puberulent ex- 
ternally. 
Sepals 2 to 4 mm. long, nearly orbicular, with short acute oat bes tips corolla 
pubescent or glabrous within ....-.-------- P. glaber. 
Sepals 5 to 7 mm. long, mostly ovate, a eemaiaee 
tip. 
eee 
' For description of a related ies. Penstemon tidestromti, omitted in the key, 
se p. 379, a 
