Vol. III.] 



FIGWORT FAMILY. 



153 



(Fig. 3253.) 



7. Pentstemon gracilis Nutt. Slender Beard-tongue 



Penlsiemon gracilis Nutt. Gen. 2: 52. 1818. 



Glabrous or very nearly so up to the glandu- 

 lar-pubescent inflorescence; stem slender, strict, 

 6 / -i8 / high. Basal and lower leaves linear-ob- 

 long or spatulate, mostly obtuse, denticulate, or 

 entire, i / -3 / long, narrowed into margined peti- 

 oles; upper leaves sessile, linear-lanceolate or 

 the uppermost lanceolate, acuminate, denticu- 

 late; thyrsus open, several-mauy-flowered; pedi- 

 cels 2 // -4 // long; calyx-segments lanceolate, 

 acute or acuminate; corolla purple, 9 // -i2 // 

 long, its tube gradually enlarged above, its 

 throat wide open; sterile filament bearded for 

 about one-half its length; capsule one-third 

 longer than the calyx. 



On moist prairies, Manitoba to Minnesota and 

 Missouri, west to the Northwest Territory and 

 Colorado. May-July. 



8. Pentstemon tubiflorus Nutt. Fun- 

 nelform Beard-tongue. (Fig. 3254.) 



Pentstemon tubiflorus Nutt. Trans. Am. Phil. Soc. 



(II.) 5: 181. 1833-37- 



Glabrous, except the viscid-pubescent calyx 

 and pedicels; stem slender, strict, 2-3^ high, 

 leafless above. Leaves oblong, ovate, or lanceo- 

 late, i / -4 / long, obtusish or acute, the basal 

 narrowed into broad margined petioles, the 

 upper sessile or clasping, entire or merely un- 

 dulate; thyrsus narrow, interrupted, the clusters 

 several-flowered; pedicels i // -3 // long, calyx- 

 segments ovate, acuminate, short, striate-nerved; 

 corolla nearly funnelform, white or purplish, 

 less than i / long, nearly as broad when ex- 

 panded, its tube gradually enlarged, the limb 

 nearly equally five-lobed, the lobes spreading; 

 sterile filament short bearded above; capsule 

 ovoid, acute, about twice as long as the calyx. 

 In moist soil, Missouri and Kansas to Arkansas. May-July. 



9. Pentstemon Cobaea Nutt. Cobaea 

 Beard- tongue. (Fig. 3255. ) 



Pentstemon Cobaea Nutt. Trans. Am. Phil. Soc. 



(11)5:182. 1833-37. 



Stem stout, densely and finely pubescent be- 

 low, glandular- pubescent above, i-2 high. 

 Leaves oblong to ovate, firm, 3 / -5 / long, den- 

 tate, the lower mostly glabrous and narrowed 

 into margined petioles, the upper sessile or 

 cordate-clasping, usually pubescent; thyrsus 

 short, several-many-flowered, open; flowers 

 about 2 / long; calyx-segments lanceolate, 

 acuminate, 5 // -7 // long; corolla purple, puber- 

 ulent without, glabrous within, its tube narrow 

 up to the top of the calyx, then abruptly di- 

 lated and campanulate, the limb obscurely 2- 

 lipped, the lobes short, rounded, spreading; 

 sterile filament sparingly bearded; capsule 

 ovoid, acute, pubescent, reticulate-veined, as 

 long as the calyx. 



On dry prairies, Kansas to Texas. May-July. 



