Vol. III.] 



FIGWORT FAMILY. 



153 



7. Pentstemon gracilis Nutt. 



Pen/s/emo>i i^racilis Null. Gen. 2:52. iSiS. 



Glabrous or very uearly so up to the glandu- 

 lar-pubesceut inflorescence; stem slender, strict, 

 6'-iS' high. Basal and lower leaves linear-ob- 

 long or spatnlate, mostly obtuse, denticulate, or 

 entire, I'-y long, narrowed into margined peti- 

 oles; upper leaves sessile, linear-lanceolate or 

 the uppermost lanceolate, acuminate, denticu- 

 late; thyrsus open, several-man}--flo\vered; 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 iiioiftt prairies, Manitoba to Minnesota and 

 Missouri, west to the Northwest Territory 

 Colorado. May-July. 



Slender Beard-tongue. (Fig. 3253.) 



and 



8. Pentstemon tubiflorus Nutt. Ftin- 

 nelform Beard-tongue. (Fig. 3254.) 



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



(II.) 5: 181. 1S33-37. 



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, a»ute, about twice as long as the caly.x. 

 In moist soil, Missouri and Kansas to Arkansas. May-]>ily. 



g. Pentstemon Cobaea Nutt. Cobaea 

 Beard- tongue. (Fig. 3255.) 



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



(II) 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- 

 uleiit 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. 



