186 SCROPHULARIACEAE. Vor. III. 
11. Pentstemon Cobaéa Nutt. Cobaea 
Beard-tongue. Fig. 3765. 
Pentstemon Cobaea Nutt. Trans. Am. Phil. Soc. (II.) 
~ 5: 182. 1833-37. 
Stem stout, densely and finely pubescent below, 
glandular-pubescent above, 1°-2° high. Leaves 
oblong to ovate, firm, 3’-5’ long, dentate, the lower 
mostly glabrous and narrowed into margined peti- 
oles, the upper sessile or cordate-clasping, usually 
pubescent; thyrsus short, several-many-flowered, 
open; flowers about 2’ long; calyx-segments lan- 
ceolate, acuminate, 5-7” long; corolla purple, 
puberulent without, glabrous within, its tube nar- 
row up to the top of the calyx, then abruptly 
dilated and campanulate, the limb scarcely 2-lipped, 
the lobes short, rounded, spreading; sterile fila- 
ment sparingly bearded; capsule ovoid, acute, pu- 
bescent, reticulate-veined, as long as the calyx. 
On dry prairies, Missouri and Kansas to Texas. 
Recorded from Ohio. May-July. 
12. Pentstemon grandiflorus Nutt. 
Large-flowered Beard-tongue. 
Fig. 3766. 
P. grandiflorus Nutt. in Fras. Cat. 1813. 
Glabrous and somewhat glaucous; stem stout, 
* 2°-4° high. Leaves all entire and obtuse, the 
basal ones obovate, narrowed into broad peti- 
oles, those of the lower part of the stem ses- 
sile, oblong or oval, 1’-23’ long, the upper 
nearly orbicular, cordate-clasping, shorter; 
thyrsus open, leafy-bracted, the bracts orbicu- 
lar, cordate; pedicels 2’’-6” long; flowers 
nearly 2’ long; calyx-segments lanceolate, 
acute, 3-4” long; corolla lavender-blue, the 
tube rather abruptly dilated above the calyx, 
the limb somewhat 2-lipped; sterile filament 
incurved, villous and capitate at the summit; 
capsule acute, 8-10” high, three times as long 
as the calyx. 
On prairies, Illinois to Minnesota, North Da- 
kota, Kansas and Colorado. Locally introduced 
eastward. June—Aug. 
13. Pentstemon acuminatus Doug]. Sharp- 
leaved Beard-tongue. Fig. 3767. 
Pentstemon acuminatus Dougl.; Lindl. Bot. Reg. pi. 
1285. 1829. 
Glabrous and glaucous; stem rather stout, strict, 
’-2° high, leafy. Leaves firm, entire, the lower 
and basal ones oblong or spatulate, obtuse or 
acute, narrowed into petioles, the upper sessile or 
clasping, lanceolate or ovate-lanceolate, 2’-3’ 
long; thyrsus narrow, sometimes I-sided, usually 
leafy-bracted below; pedicels becoming 4”-8” 
long in fruit; calyx-segments lanceolate, acute, 
2”-3” long; corolla blue, 9”’-10” long, its tube 
rather gradually dilated, the limb 2-lipped; sterile 
filament bearded along the dilated summit; cap- 
suie acute, twice as long as the calyx. 
In dry soil, Minnesota to Nebraska, Texas, Mani- 
toba, Alberta, Oregon and New Mexico. St. Joseph’s- 
wand. May-Aug. 
