GENUS g. 



FIGWORT FAMILY. 



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, i-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^"-^' long, their margins commonly eroded; 

 corolla blue or purple, i'-ii' 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. 

 Pentstemon coeruleus Nutt. Gen. 2: 52. 



1814. 

 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, \\'-2\' long, ii"-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"-io" 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, i-2 

 high. Leaves linear or elongated-lanceolate, en- 

 tire, sessile and slightly clasping, acute, acumi- 

 nate, or the lowest obtusish at the apex, 2'-s' 

 long, I "-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, i" 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. 



