380 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
height of the plant, composed of (about) 9 to 15 fascicles, each of 2 short axillary 
branches, their pedicels (when in bloom) shorter than the peduncles; sepals 3 to 5 mm. 
long, narrowly ovate, acute to slightly acuminate, not veined, with no or narrow, 
slightly denticulate, scarious margin, glabrous or glabrate; corolla 15 to 20 mm. long 
the tube and throat 12 to 15 mm. long, the throat somewhat inflated and rounded 
ventrally, the 2 posterior lobes 3 to 5 mm. long, united and arched one-third to one- 
half their length, projecting, the 3 anterior lobes about equaling the posterior ones, 
united at base, the free portions spreading; corolla glabrous without and within, blue 
(not seen fresh); anther sacs widely divaricate, 1.6 to 1.8 mm. long, oblong-lanceolate, 
distinct, opening from distal apex nearly (or quite) throughout, glabrous; sterile fila- 
ment equaling the anterior pair, scarcely enlarging distally, flattened, bearded with 
yellow hairs on the posterior face, more densely so distally; capsule not seen. 
Type in the U. S. National Herbarium, no. 507825, collected in the oak zone, ‘‘XL’’ 
Canyon, San Pitch mountains, central Utah, altitude 1,650 meters, in flower, June 24, 
1908, by Ivar Tidestrom (no. 1296). 
‘Occasional in the oak zone,”’ at altitudes of 1,650 to 1,800 meters; Upper Sonoran 
Zone; flowering in June. Wasatch and San Pitch mountains of central Utah. 
Urau: San Pete: “XL” Canyon, San Pitch Mountains, Tidestrom 1296 (U); Ephraim 
Canyon, Tidestrom 1134 (U). 
Related to P. laevis (p. 347) and P. wardii (p. 347), the three species to be dis- 
tinguished as follows: 
Corolla glandular-puberulent externally; sterile filament glabrous; plants 20 to 25 
cm. tall, densely cinereous-puberulent.................2...20e0eeee P. wardii. 
Corolla glabrous externally; sterile filament bearded; plants 30 to 70 cm. tall, glabrous 
or finely puberulent. 
Plant glabrous throughout; sepals 4 to 7 mm. long, conspicuously acuminate, 
with scarious dentate margins; corolla 20 to 30 mm. long; leaves at the base 
of the stem ovate, those on the stem conspicuously clasping by a rounded 
base - 2... cece eee ce eee cence eee eeneneeeees P. laevis. 
Plant puberulent; sepals 3 to 5mm. long, acute or slightly acuminate, with margins 
slightly or not scarious; corolla 15 to 20 mm. long; leaves at base of stem oblance- 
olate, those on the stem narrowed toa slightly clasping base. .P. tidestromii. 
35a. Penstemon mensarum Pennell, sp. nov. 
Stem 40 to 50 cm. tall, from a slender caudex, finely glandular-pubescent in the 
inflorescence, slightly glaucous; leaves dull green, not glaucous, obscurely veined, 
glabrous, those at the base of the stem with oblong, obtuse to acutish blades 5 to 6 cm. 
long, narrowed into petiole-like bases about one-half length of blade, those of the stem 
similar, oblanceolate, the upper clasping (bases meeting around stem), the largest 8 cm. 
long, 1.5 cm. wide; thyrsus lax, secund nearly one-half height of plant, composed of 
at least 8 fascicles, each consisting of 2 axillary ascending branches; pedicels shorter 
than to equaling the peduncles, together reaching 20 mm. long; sepals 4 mm. long, 
oblong-ovate, acutish to acute, obscurely or not veined, proximally with obscure 
narrow whitish margin, finely glandular-pubescent; corolla 20 to 24 mm. long, the tube 
and throat 15 mm. long, the throat somewhat inflated and rounded ventrally, the 
2 posterior lobes 4 mm. long, united and arched two-fifths their length, the free por- 
tions projecting, the 3 anterior lobes much longer, united at base, the free portions 
spreading; corolla externally glandular-puberulent, within glabrous, blue (not seen 
fresh); anther sacs widely divaricate, 1 mm. long, oblong-lanceolate, distinct, opening 
from the distal apex for nearly the entire length, pubescent on the side with slender 
white hairs, their length much less than the width of the sacs; sterile filament as long 
as the anterior pair, gradually enlarging distally, flattened, bearded on posterior face 
distally with scattered (or at apex dense) yellow hairs; capsule not seen. 
