GENUS 9. FIGWORT FAMILY, 187 
14. Pentstemon glaber Pursh. Large 
Smooth Beard-tongue. Fig. 3768. 
Pentstemon glaber Pursh, Fl. Am. Sept. 738. 1814. 
Glabrous, somewhat glaucous; stem ascending 
or erect, rather stout, leafy, 1°-2° high. Leaves 
entire, firm, the basal and lower ones narrowed 
into petioles, the middle ones oblong or oblong- 
lanceolate, acuminate, sessile, the upper lanceo- 
late, acuminate, sessile, scarcely clasping; thyrsus 
narrow, elongated, densely many-flowered; pedi- 
cels 3-7” long in fruit; calyx-segments ovate- 
lanceolate, scarious-margined, abruptly acumi- 
nate, 3-4” long, their margins commonly eroded; 
corolla blue or purple, 1-13’ long, rather abruptly 
expanded above the calyx, the limb somewhat 
2-lipped, the lobes rounded; sterile filament 
bearded at the slightly enlarged summit; capsule 
narrowly ovoid, acute, about twice as long as 
the calyx. 
In moist soil, South Dakota to Nebraska, Wyo- 
ming and Arizona. Far western plants previously 
referred to this species prove to be distinct. May—Aug. 
15. Pentstemon angustifolius Pursh. 
Pale-blue Beard-tongue. Fig. 3769. 
P. angustifolius Pursh, Fl, Am. Sept. 738. 1814. 
Pentstemon coeruleus Nutt. Gen. 2: 52, 1818. 
Glabrous and glaucous; stem slender, erect, 
leafy, 6-15’ high. Leaves all linear or linear- 
lanceolate, entire, the lower narrowed into 
petioles, obtusish at the apex, the upper ses- 
sile, acute, 14’-23’ long, 13’-2” wide; thyrsus 
narrow, spike-like, mostly dense; bracts lan- 
ceolate, acuminate; pedicels very short; ca- 
lyx-segments _linear-lanceolate, acuminate, 
2-3” long; corolla blue, or nearly white, 
( 8”-10” long, the tube gradually enlarged, the 
limb somewhat 2-lipped; sterile filament 
bearded at the summit. 
In dry soil, western Nebraska to North Da- 
kota and Montana. May-July. 
16. Pentstemon Haydeni S. Wats. Hay- 
den’s Beard-tongue. Fig. 3770. 
P. Haydeni S. Wats. Bot. Gaz. 16: 311. 1891. 
Glabrous, not at all glaucous or slightly so; 
stem decumbent, simple or branched, leafy, 1°-2° 
high. Leaves linear or elongated-lanceolate, en- 
tire, sessile and slightly clasping, acute, acumi- 
nate, or the lowest obtusish at the apex, 2’-5’ 
long, 1-5” wide; thyrsus narrow, dense; bracts 
ovate or ovate-lanceolate, large, cordate-clasp- 
ing, acute, or acuminate; fruiting pedicels 2”-3” 
long; calyx-segments lanceolate, striate-nerved, 
acuminate, 3-5” long; corolla blue, 1’ long or 
more, the tube broadly dilated above the calyx, 
the limb nearly equally 5-lobed; capsule acute, 
twice as long as the calyx. 
In moist soil, Nebraska, Kansas and Wyoming. 
