'54 



SCROPHULARIACEAE. 



[Vol. III. 



10. Pentstemon grandiflorus Nutt. 



L,arge-flowered Beard-tongue. (Fig. 3256.) 



y*. grandijlorus Nutt. in Fras. Cat. 1813. 



Glabrous and somewhat glaucous; stem 

 stout, 2°-4° high. Leaves all entire and ob- 

 tuse, the basal ones obovate, narrowed into 

 broad petioles, those of the lower part of the 

 stem sessile, oblong or oval, \'-2'/i' long, the 

 upper nearly orbicular, cordate-clasping, 

 shorter; thyrsus open, leafy-bracted, the 

 bracts orbicular, cordate; pedicels 2"-6" 

 long; flowers nearly 2' long; calyx-segments 

 lanceolate, acute, 3"-4" long; corolla laven- 

 der-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, S"-io" high, 

 three times as long as the calyx. 



On prairies, Illinois to Minnesota and South 

 Dakota, south to Kansas. June-Aug. 



II. Pentstemon acuminatus Dougl. 

 Sharp-leaved Beard-tongue. (Fig. 3257.) 



Penlslemon acuminalus Dougl.; Lindl. Bot. Reg. 

 pi. 12S5. :829. 



Glabrous and glaucous; stem rather stout, 

 strict, 6'-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"-S" long in fruit; calj-x-segments lanceolate, 

 acute, 2"-3" long; corolla blue, 9"-io" long, its 

 tube rather gradually dilated, the limb 2-lipped; 

 sterile filament bearded along the dilated sum- 

 mit; capsule acute, twice as long as the calyx. 



In dry soil, Northwest Territory to Nebraska and 

 Texas, weet to Oregun and New Mexico. May-.\ug. 



12. Pentstemon glaber Pursh. Large Smooth Beard-tougue. (Fig. 3258.) 



Penlslemon ^/ai^r Pursh, Fl. Kxa. Sept. 73S. 1814. 

 Glabrous, somewhat glaucous; stem ascend- 

 ing or erect, rather stout, leafy, i^-a" high. 

 Leaves entire, firm, the basal and lower ones 

 narrowed into petioles, the middle ones ob- 

 long or oblong-lanceolate, acuminate, sessile, 

 the upper lanceolate, acuminate, sessile, 

 scarcely clasping; thyrsus narrow, elongated, 

 densely many-flowered; pedicels i"-y" long 

 in fruit; calyx segments ovate-lanceolate, scari- 

 ous margined, abruptly acuminate, 3"-4" long, 

 their margins commonly eroded; corolla blue 

 or purple, i'-i}4' long, rather abruptly ex- 

 panded above the calyx, the limb somewhat 2- 

 lippcd, the lobes rouuded; sterile filament 

 bearded at the slightly enlarged summit; cap- 

 sule narrowly ovoid, acute, about twice as long 

 as the calyx. 



In moist soil, South Dakota to Nebraska and 

 .\rizona, west to Oregon and California. May-.\ug. 



