1060 RHINANTHACEAE 



rather obtuse : panicles few-flowered : calyx-lobes ovate-oblong, 4-5 mm. long : corolla 

 purple, 6-19 mm. long : staminodium bearded at the apex. 

 In dry soil, near Louisville, Georgia. 



2. Pentstemon tubiflorus Nutt. Glabrous to the inflorescence. Stems 5-12 dm. 

 tall, sometimes rather naked above : leaf-blades various, those of the basal and lower stem- 

 leaves spatulate to oblanceolate or oblong, those of the upper stem-leaves lanceolate to 

 ovate, 3-15 cm. long, entire or rarely minutely toothed : panicle narrow, 0.5-5 dm. long, 

 the lower branches remote : calyx-lobes ovate to oblong-lanceolate, 3-5 mm. long : corolla 

 white, 1.5-2 cm. long, not strongly 2-lipped ; the tube gradually dilated : staminodium 

 slightly bearded at the apex : capsules 6-8 mm. long. 



On low prairies, Missouri to Kansas, Arkansas and the Indian Territory. Spring and summer. 



3. Pentstemon Pentstemon (L.) Britton. Glabrous below the inflorescence. 

 Stems 3-7 dm. tall, sometimes tufted : basal and lower stem-leaves 8-15 cm. long, with 

 oblong or spatulate blades ; upper stem-leaves with oblong-lanceolate or broadly linear 

 sessile blades, sometimes undulate or slightly toothed : calyx-lobes glandular-pubescent or 

 glabrate in age, 3-4 mm. long or 5 mm. at maturity, ovate-lanceolate or lanceolate, erect 

 or nearly so, acute : corolla purplish, usually 16-18 mm. long ; tube dilated about the 

 middle but not gibbous : staminodium densely bearded : capsules ovoid, 5-6 mm. long, 

 much surpassing the calyx. [P. laevigatus Soland.] 



In woods and thickets, Pennsylvania to Kentucky, Florida and Louisiana. Spring and summer. 



4. Pentstemon Digitalis (Sweet) Nutt. Glabrous below the inflorescence. Sterna 

 3-10 dm. tall : basal and lower stem-leaves with spatulate or oblong blades and broad petiole - 

 like bases ; upper stem-leaves oblong, lanceolate or ovate-lanceolate, 5-15 cm. long, entire 

 or remotely toothed : panicle lax : calyx-lobes lanceolate, 5-7 mm. long, glandular pubes- 

 cent, spreading or recurved : corolla white or pinkish, 2-2.5 cm. long ; tube abruptly 

 dilated and gibbous about the middle : staminodium strongly bearded : capsules ovoid, 

 7-9 mm. long, somewhat surpassing the calyx. 



In fields and copses, Maine to Illinois, south to Georgia and Arkansas. Spring and summer. 



5. Pentstemon calycosus Small. Glabrous below the very sparingly pubescent in- 

 florescence. Stems 4-9 dm. tall : basal and lower stem-leaves with spatulate blades ; upper 

 stem-leaves oblong to lanceolate or ovate-lanceolate, acute or acuminate, sharply serrate or 

 nearly entire, partly clasping : panicle often lax : calyx-lobes sparingly glandular-pubes- 

 cent when young, with a narrowly lanceolate base and linear-subulate tip, becoming fully 

 1 cm. long : corolla purple, about 2.5 crn. long, abruptly dilated at the middle : stamino- 

 dium strongly bearded above the middle : capsules ovoid, 5-6 mm. long. 



On banks and river bluffs, Kentucky to Missouri, south to Alabama and Arkansas. Spring. 



6. Pentstemon hirsutus (L. ) Willd. Stems sometimes tufted, 2-7 dm. tall, hirsute 

 and more or less glandular. Basal and lower stem-leaves with ovate, oval, elliptic or spatu- 

 late blades and petiole-like bases : upper stem-leaves oblong to lanceolate, 4-10 cm. long, 

 sessile, more or less toothed : panicles lax : calyx -lobes glandular-pubescent, ovate to 

 lanceolate, 5-6 mm. long : corolla purplish, about 2 cm. long, densely bearded in the 

 throat : staminodium copiously bearded above the middle : capsules conic-ovoid, 7-9 mm. 

 long. 



In rocky soil and dry woods, Maine to Manitoba, Florida and Texas. Spring and summer. 



7. Pentstemon can6acens Britton. Stems canescent, 2-7 dm. tall. Basal and 

 lower stem-leaves oblong or elliptic, narowed into petiole-like bases ; upper stern-leaves 

 with oblong, fiddle-shaped, lanceolate-ovate or ovate blades, clasping, usually dentate : 

 calyx-lobes lanceolate, 4-7 mm. long, glandular-pilose : corolla white or pinkish, 2-2.5 cm. 

 long ; tube abruptly enlarged at the middle, scarcely bearded in the throat : staminodium 

 bearded with long hairs : capsules ovoid, 6-7 mm. long, slightly surpassing the calyx. 



On mountain slopes, Virginia and West Virginia to North Carolina. Spring. 



8. Pentstemon australis Small. Stems puberulent, often purple, 3-10 dm. tall, 

 often branched at the base. Basal and lower stem-leaves with spatulate to oblong blades, 

 narrowed into narrowly winged petioles ; upper stem-leaves few, the blades lanceolate to 

 almost linear, remotely toothed or undulate, partly clasping, but not decurrent : panicle 

 narrow : calyx-lobes lanceolate or ovate-lanceolate in age, 5-6 mm. long, acute or acutish, 

 often purple or purplish -tinged : corolla purple, 1.5-2 cm. long, the lower lip sparingly 

 bearded : staminodium densely bearded : capsules conic-ovoid, 8-10 mm. long, about twice 

 as long as the calyx. 



In sandy soil, Georgia and Arkansas to Florida and Texas. Spiing. 



9. Pentstemon pallidus Small. Stems puberulent, or sometimes canescent-puber- 

 ulent, 3-9 dm. tall. Basal and lower stem-leaves with oblong elliptic or nearly spatulate 



