154 



SCROPHULARIACKAK. 



[Vol. III. 



io. Pentstemon grandiflorus Xutt. L,arge- flowered Beard-tongue. (Fig.3256.) 



P. grandiflorus 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 l / 4. / 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, 8 // -io // high, 

 three times as long as the calyx. 



On prairies, Illinois to Minnesota and South 

 Dakota, south to Kansas. June-Aug. 



11. Pentstemon acuminatus Dougl. 

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



Pentstemon acuminatus Dougl. ; Lindl. Bot. Reg. 

 pi. 12S5. 1829. 



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 // -8 // long in fruit; calyx-segments lanceolate, 

 acute, 2 // -3 // long; corolla blue, q/'-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, west to Oregon and New Mexico. May-Aug. 



12. Pentstemon glaber Pursh. 



Large Smooth Beard-tongue. (Fig. 3258.) 



Pentstemon glaber Pursh, Fl. Am. Sept. 738. 1814. 

 Glabrous, somewhat glaucous; stem ascend- 

 ing or erect, rather stout, leafy, i-2 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 3 // -7 // long 

 in fruit; calyx segments ovate-lanceolate, scari- 

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

 their margins commonly eroded; corolla blue 

 or purple, i / -ij^ / long, rather abruptly ex- 

 panded above the calyx, the limb somewhat 2- 

 lipped, the lobes rounded; 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 

 Arizona, west to Oregon and California. May-Aug. 



