I Ri IPHULARIACEAE. 



Vol in 



ii. Pentstemon Cobaea Xutt. Cobaea 

 Beard-tongue. Fig. 3?<^. 



Pentstemon Cobaea Nutt. Trans. Am. Phil. Soc. (II. i 

 5: 182. 1833-37. 



Stem stout, densely and finely pubescent below, 

 glandular-pubescent above, i-2 high. Leaves 

 oblong to ovate, firm, 3' 5' long, dentate, the lower 

 mostly glabrous and narrowed into margined peti- 

 oles, the upper sessile or cordate-clasping, usually 

 pubescent ; thyrsus short, several-many-flowered, 

 "pen; flowers about 2' long; calyx-segments lan- 

 ceolate, acuminate, s"~7" long; corolla purple, 

 puberulent without, glabrous within, its tube nar- 

 row up to the top of the calyx, then abruptly 

 dilated and campanulate, the limb scarcely 2-lipped, 

 the lobes short, rounded, spreading; sterile fila- 

 ment sparingly bearded ; capsule ovoid, acute, pu- 

 bescent, reticulate-veined, as long as the calyx. 



On dry prairies, Missouri and Kansas to Texas. 

 Recorded from Ohio. May-July. 



12. Pentstemon grandiflorus Xutt. 



Large-flowered Beard-tongue. 



Fig. 3766. 



P. grandiflorus Nutt. in Fras. Cat. 1813. 



Glabrous and somewhat glaucous ; stem stout, 

 2-4 high. Leaves all entire and obtuse, the 

 basal ones obovate, narrowed into broad peti- 

 oles, those of the lower part of the stem ses- 

 sile, oblong or oval, l'-2i' long, the upper 

 nearly orbicular, cordate-clasping, shorter; 

 thyrsus open, leafy-bracted, the bracts orbicu- 

 lar, cordate; pedicels 2"-6" long; flowers 

 nearly 2' long ; calyx-segments lanceolate, 

 acute, 3 "-4" long ; corolla lavender-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"-I0" high, three times as long 

 as the calyx. 



On prairies, Illinois to Minnesota. North Da- 

 kota, Kansas and Colorado. Locally introduced 

 eastward. June-Aug. 



13. Pentstemon acuminatus Dougl. Sharp- 

 leaved Beard-tongue. Fig. 3767. 



Pentstemon acuminatus Dougl.; Lindl. Bot. Reg. pi. 

 1385. 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 summit; cap- 

 sule acute, twice as long as the calyx. 



In dry soil, Minnesota to Nebraska, Texas, Mani- 

 toba, Alberta, Oregon and New Mexico. St. Joseph's- 

 wand. May-Aug. 



