184 SCROPHULARIACEAE, Vou. III. 
5. Pentstemon Albidus Nutt. White-flowered 
Beard-tongue. Fig. 3759. 
Pentstemon albidus Nutt. Gen. 2: 53. 1818. 
Stems puberulent below, densely glandular-pubes- 
cent above, rather stout, 6-10’ high. Basal and lower 
leaves spatulate or oblong, obtusish, mostly entire, 
the upper lanceolate or oblong, sessile, denticulate, 
acute or acuminate, 13’-23’ long, 3-6” wide; thyrsus 
narrow, raceme-like, leafy-bracted, interrupted; ca- 
lyx-segments lanceolate, acuminate, viscid, one-half 
as long as the corolla-tube; corolla white or nearly 
so, 8-10” long, funnelform, the tube gradually di- 
lated upward, the limb nearly equally 5-lobed, the 
lobes spreading; sterile filament slightly bearded with 
short hairs. 
On plains, Minnesota and South Dakota to Assini- 
boia, Colorado, Nebraska and Texas. June—Aug. 
6. Pentstemon Pentstémon (L.) Brit- 
ton. Smooth Beard-tongue. 
Fig. 3760. 
Chelone Pentstemon L. Sp. Pl. Ed. 2, 850. 1763. 
Pentstemon laevigatus Soland. in Ait. Hort. Kew. 
2: 300. 1789. 
P. Pentstemon Britt. Mem. Torr. Club 5: 291. - 1894. 
Glabrous, except the somewhat glandular- 
pubescent inflorescence; stem slender, 2°-3° 
high. Basal and lower leaves oblong or oval, 
obtuse, 3’-6’ long, narrowed into margined 
petioles, denticulate; upper leaves sessile or 
slightly clasping, acute, oblong, or lanceolate, 
denticulate; thyrsus open, usually many-flow- 
ered; flowers nearly sessile; calyx-segments 
lanceolate, acute, short; corolla purple or pur- 
plish, 8’-10” long, the tube gradually enlarged 
above, the throat wide open, scarcely or not at 
all bearded, the lobes spreading; sterile fila- 
ment thinly bearded for about one-half its 
length, or more densely bearded above. . 
Woods and thickets, Pennsylvania to Florida,Kentucky and Louisiana. Occasionally escaped 
from cultivation further north and east. May-July. 
Ss 
7. Pentstemon Digitalis (Sweet) Nutt. 
Foxglove Beard-tongue. Fig. 3761. 
Chelone Digitalis Sweet, Brit. Fl. Gard. 2: pl. 120. 
1825-27. 
Pentstemon Digitalis Nutt. Trans. Am. Phil. Soc. 
CII.) 5: 181. 1833-37. 
Pentstemon laevigatus var. Digitalis A. Gray, Syn. 
Fl. 2: Part 1, 268. 1878. 
Glabrous, except the glandular-pubescent in- 
florescence; stem rather stout, 2°-5° high. 
Lower and basal leaves oblong or oval, obtuse 
or acutish, entire or repand, 2’-7’ long, nar- 
rowed into margined petioles; upper leaves 
ovate, lanceolate or ovate-lanceolate, sessile 
and more or less cordate-clasping at the base, 
acuminate, sharply denticulate; thyrsus open, 
many-flowered; pedicels 1’~3’’ long; calyx- 
segments lanceolate; corolla white, 1-1} long, 
the tube abruptly dilated, the limb moderately 
2-lipped, the throat open; sterile filament 
bearded above. 
In fields and thickets, Maine to New York, IIli- 
nois, Kansas, Virginia and Arkansas. Doubtless 
escaped from cultivation in its northeastern range. 
May-July. 
