RHINANTHACEAE 1059 
obtuse: corolla white or cream-colored, 2.5-3 cm. long, the lower lip copiously bearded 
within: capsules ovoid, 10-12 mm long. 
In low thickets and swamps, Newfoundland to Manitoba, Florida and Kansas. 
S. Chelone obliqua L. Similar in habit to C. glabra, but seldom as tall. Leaf- 
blades often more sharply serrate or incised : bracts and calyx-lobes puberulent and mani- 
festly ciliolate : corolla pink, fully 2 cm. long, the lower lip rather sparingly bearded. ` 
In damp thickets and along streams, Virginia to Illinois, south to Florida. 
4. Chelone Lyónti Pursh. Stems 3-8 dm. tall, usually simple : leaf-blades ovate to 
elliptic, 5-15 cm. long, acuminate, sharply serrate, cuneate, rounded or truncate at the 
base: racemes 2-5 cm. long: calyx-lobes oval to suborbicular, 6-8 mm. long, like the 
bracts ciliolate at least at the tip: corolla deep rose-purple, about 2.5 cm. long: capsules 
ovoid, 11-14 mm. long. 
On damp mountain slopes and summits, Virginia to North Carolina, Tennessee and Georgia. 
10. PENTSTEMON Soland. 
Perennial caulescent herbs, with glabrous glaucous or pubescent foliage. Leaves oppo- 
site: blades entire, toothed or dissected, sometimes clasping at the base. Flowers in terminal 
racemes or panicles. Calyx-lobes 5, entire or toothed. Corolla usually showy, rather 
elongated, 2-lipped. Stamens 4: filaments about equal in length: staminodium slender, 
bearded. Styles united: stigma capitate. Ovules numerous. Capsule often ovoid. 
Seeds wingless, angled or rounded. BEARD-TONGUE. 
Leaf-blades pinnately dissected or pinnately parted. 1. P. dissectus. 
Leaf-blades entire or merely toothed. 
Foliage more or less pubescent or puberulent, sometimes only in the inflores- 
cence. 
Stems glabrous below the inflorescence, or rarely puberulent in lines. 
Corolla-tube gradually dilated. 
Corolla-tube abruptly dilated about the middle. 
Calyx-lobes lanceolate to ovate, much less than 1 cm. long. 
Corolla purplish ; tube not gibbous above the point of enlargement. 3. P. Pentstemon. 
Corolla white or pinkish ; tube gibbous above the point of enlarge- 
4. P. Digitalis. 
ment, 
Calyx-lobes linear-subulate from a narrowly lanceolate base, becom- 
ing fully 1 em. long. 5. P. calycosus. 
Stems pubescent or puberulent. 
Throat of the corolla less than 1 em. in diameter. 
Primary branches of the inflorescence elongated or manifest. 
Stems hirsute or canescent, often glandular. : 
Corolla densely bearded in the throat: upper leaves with nar- 
rowly lanceolate blades. 3 6. P. hirsutus. 
Corolla scarcely bearded in the throat: upper leaves with ovate 
or broadly lanceolate blades. 
Stems puberulent. 
Upper leaves or lower bracts not dilated at the base. 
Dates not decurrent on the stem. : 
Calyx-lobes lanceolate, at least during anthesis: capsules 
N 
. P. tubiflorus. 
-1 
. P. canescens. 
8-10 mm. long. 8. P. australis. 
Calyx-lobes ovate to triangular: capsules 5-6 mm. long. 9. P. pallidus. 
Leaí-bases manifestly decurrent on the stem. 10. P. multiftorus. 
Upper leaves and lower bracts with dilated and rounded bases. 
Calyx-lobes acute or short-acuminate : corollas 2 cm. long or 
longer: capsules longer than the calyx. — 
Corol efe gradually dilated, the lower lip sparingly 
arded. 11. P. Mackayanus. 
iioi entra abruptly gibbous, the lower lip copiously 
bearded. 12. P. Smallii. 
Calyx-lobes with long slender tips: corollas 1.5 cm. long or : 
shorter: capsules shorter than the calyx. 13. P. tenuis. 
Primary branches of the inflorescence suppressed or very short. : 
Mature calyx-lobes lanceolate: capsules not veined. 14. P. albidus. 
Mature calyx-lobes ovate or ovate-lanceolate: capsules promi- : 
nently veined. 15. P. Guadalupensis. 
Throat of the corolla over 1 cm. in diameter. ; 
Staminodium glabrous. 16. P. triflorus. 
Staminodium bearded. 
Corolla less than 3 cm. long: capsules smooth, much longer than : 
the calyx-lobes. 17. P. Helleri. 
Corolla over 3 em. long: capsules prominently veined, about as 
long as the calyx-lobes. 18. P. Cobaea. 
Foliage perfectly glabrous, manifestly glaucous. 
Leaf-blades distinct at the base: corolla lilac or lavender-blue: stamino- : 
dium bearded 19. P. grandiflorus. 
Leaf-blades connate-perfoliate : corolla deep scarlet : staminodium glabrous. 20. P. Murrayanus. 
1. Pentstemon disséctus Ell. Puberulent. Stemsabout 6 dm. tall: leaves opposite ; 
blades pinnately dissected or pinnatifid above, the segments 7-11, linear, 1-2 mm. wide, 
