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 tubiflérus 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 em. 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 Péntstemon (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. Stems 
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 calycósus Small. Glabrous below the very sparingly pubescent 1n- 
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 em. long: corolla purple, about 2.5 cm. 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 hirsütus (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 le: 
lanceolate, 5-6 mm. long: corolla purplish, about 2 em. long, densely bearded in the 
SUN: staminodium copiously bearded above the middle: capsules conic-ovoid, 7-9 mm. 
ong. 
In rocky soil and dry woods, Maine to Manitoba, Florida and Texas. Spring and summer. 
7. Pentstemon canéscens Britton. Stems canescent, 2-7 dm. tall. Basal e 
lower stem-leaves oblong or elliptic, narowed into petiole-like bases; upper uj aie 
with oblong, fiddle-shaped, lanceolate-ovate or ovate blades, clasping, usually ety si 
calyx-lobes lanceolate, 4-7 mm. long, glandular-pilose : corolla white or pinkish, 2 n a 
long ; tube abruptly enlarged at the middle, scarcely bearded in the throat: stamino@iu 
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 austràlis Small. Stems puberulent, often purple, 3- 10 xr s 
often branched at the base. Basal and lower stem-leaves with spatulate to oblong : e d 
narrowed into narrowly winged petioles ; upper stem-leaves few, the blades tangeo peT 
almost linear, remotely toothed or undulate, partly clasping, but not decurrent : P Koh 
narrow : calyx-lobes lanceolate or ovate-lanceolate in age, 5-6 mm. long, acute or im ly 
often purple or purplish-tinged : corolla purple, 1.5-2 cm. long, the lower lip Ar si A 
bearded : staminodium densely bearded : capsules conic-ovoid, 8-10 mm. long, abou 
as long as the calyx. 
In sandy soil, Georgia and Arkansas to Florida and Texas. Spring. 
9. Pentstemon pállidus Small. Stems puberulent, or sometimes can 
ulent, 3-9 dm. tall. Basal and lower stem-leaves with oblong elliptic or near 
escent-puber- 
ly spatulate 
