PENNELL—SCROPHULARIACEAE OF THE ROCKY MOUNTAINS. 359 
mostly 3 to 5 cm. long, 2 to 2.5 cm. wide; thyrsus narrowly elongate, one-half (or 
more) the height of the plant, composed of 6 to 12 fascicles, each consisting of 2 short 
axillary branches, their pedicels longer than or equaling the peduncle; sepals 5 to 6 
mm. long, ovate, acutish to acute, obscurely and finely ribbed, with white to pinkish 
scarious margins, glabrous; corolla 20 mm. long, the tube and throat 14 mm. long, the 
throat inflated and rounded ventrally, the 2 posterior lobes 6 mm. long, united and 
arched one-third their length, the three anterior lobesslightly longer, united at base, 
all the free portions widely spreading; corolla externally glabrous, within lanate-pue 
bescent with few hairs over the base of anterior lobes or glabrous, pink, changing to 
blue, within throat with more or less conspicuous red-purple lines; anther sacs widely 
divaricate (explanate), 1 mm. long, oblong, slightly confluent, with short line of con- 
tact, opening throughout, the suture glabrous; sterile filament 14 to 15 mm. long,. 
slightly exserted, flat, much enlarged distally into a broad white obtuse expansion, 
recurved at the apex, bearded on the posterior face distally with two lines of short: 
dense golden-yellow hairs; capsule 10 to 12 mm. long, ovate, acuminate, glabrous, 
brown; seeds 4 to5 mm. long, irregularly lanceolate in outline, nearly straight, irregu- 
larly convolute, the angles sharp, semiwinged, the surface alveolate-reticulate, 
cinnamon-brown, glistening. 
Type in the herbarium of the New York Botanical Garden, collected on high prairie 
(mesa) east of Pueblo, Pueblo County, Colorado, in flower, June 5, 1915, by F. W. 
Pennell (no. 5732). Isotypes in the U. S. National Herbarium and in the Rocky 
Mountain Herbarium. ; 
Loam sagebrush mesas, at altitudes of 1,400 to 1,700 meters; Upper Sonoran Zone; 
flowering in early June. Upper valley of Arkansas River, Colorado. 
Cotoravo: Fremont: Canon City, Brandegee (M). Pueblo: East of Pueblo, Pennell 
5732 (R, U, Y); west of Pueblo, Pennell 5734 (D, F, H, M, P, U, Y), 6315 (B, 
D, F, H, K, M, P, R, 8, U, Y). 
46. Penstemon lentus Pennell, sp. nov. 
Stems several, 20 to 30 cm. tall, from a relatively long, branched caudex, glabrous, 
pale or bluish glaucous; leaves strongly thickened, pale or dull green, glaucous, in 
age evidently reticulate-veined, glabrous, those at the base of the stem with more 
or less broadly oval, obtuse to acute blades 2.5 to 4 cm. long, rather abruptly nar- 
rowed into strongly margined petioles 1.5 to 2.5 cm. long, those of the stem clasping 
(bases of opposite leaves meeting around stem), lanceolate to ovate, acute or obtuse 
with a mucro, the largest mostly 3 to 7 cm. long, 1 to 2 cm. wide; thyrsus narrowly 
elongate, one-third to one-half the height of the plant, composed of 4 to 8 fascicles, 
each consisting of 2 short axillary branches, the pedicels shorter or longer than the 
peduncle; sepals 3 to 6 mm. long, ovate, acute to acuminate, fine-ribbed, with 
evident narrow, white to pinkish, slightly sinuate, scarious margins, glabrous; co- 
rolla 18 to 20 mm. long, the tube and throat 13 to 14 mm. long, the throat somewhat 
inflated and rounded ventrally, the 2 posterior lobes 5 to 6 mm. long, united and 
arched one-fourth their length, the 3 anterior lobes slightly longer, 4 to 6 mm. wide, 
united at the base, all free portions more or less spreading; corolla externally glabrous, 
within slightly lanate-pubescent over the bases of the anterior lobes, glabrous else- 
where, blue or bluish (not seen fresh); anther sacs widely divaricate (explanate), 0.9: 
tol mm. long, oblong, distinct, with relatively long line of contact, opening from the 
distal apex throughout, the suture glabrous; sterile filament slightly exserted, flat, 
slightly enlarged distally, recurved at apex, densely bearded on the posterior face 
toward the apex with relatively short, yellow hairs; capsule 8 mm. long, ovate, 
acuminate, glabrous; seeds 2 to 3 mm. long, curved in outline, the angles sharp, 
the surface dull brown. 
Type in the herbarium of the New York Botanical Garden, collected at Arboles, 
Colorado, in flower, June 3, 1899, by C. F. Baker (no. 596; distributed as P. acumi- 
