KHIXAXTHACEAE 



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, Newfoundla'iid to Manitoba, Florida and Kansas. 



3. 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 Lyonii 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. 

 Leaf-blades entire or merely toothed. 



Foliage more or less pubescent or puberulent, sometimes only in the inflores- 

 cence. 

 Stems glabrous below the infiorescence, 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. 

 Corolla white or pinkish ; tube gibbous above the point of enlarge- 

 ment. 

 Calyx-lobes linear-subulate from a narrowly lanceolate base, becom- 

 ing fully 1 cm. long. 

 Stems pubescent or puberulent. 



Throat of the corolla less than 1 cm. 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. 

 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. 

 Leaf-bases not decurrent on the stem. 



Calyx-lobes lanceolate, at least during anthesis : capsules 



8-10 mm. long. 

 Calyx-lobes ovate to triangular : capsules 5-6 mm. long. 

 Leaf-bases manifestly decurrent on the stem. 

 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. 

 Corolla-tube gradually dilated, the lower lip sparingly 



bearded. 

 Corolla-tube abruptly gibbous, the lower lip copiously 

 bearded. 

 Calyx-lobes with long slender tips: corollas 1.5 cm. long or 

 shorter : capsules shorter than the calyx. 

 Primary branches of the inflorescence suppressed or very short. 

 Mature calyx-lobes lanceolate : capsules not veined. 

 Mature calyx-lobes ovate or ovate-lanceolate : capsules promi- 

 nently veined. 

 Throat of the corolla over 1 cm. in diameter. 

 Staminodium glabrous. 

 Staminodium bearded. 



Corolla less than 3 cm. long: capsules smooth, much longer than 



the calyx-lobes. 

 Corolla overs cm. long: capsules prominently veined, about as 

 long as the calyx-lobes. 

 Foliage perfectly glabrous, manifestly glaucous. 



Leaf-blades distinct at the base : corolla lilac or lavender-blue : stamino- 

 dium bearded. 

 Leaf-blades connate-perfoliate : corolla deep scarlet : staminodium glabrous. 



1. P. dissedus. 



2. P. ttcbiflorits. 



3. P. Pentstemon. 



4. P. Digitalis. 



5. P. calycosus. 



6. P. hirsutus. 



7. P. ca7iescens. 



8. P. ausfralis. 



9. P. pallidas. 

 10. P. muUiJioni.?. 



11. P. Mackayanus. 



12. P. Smallii. 



13. P. tenuis. _ 



14. P. albidus. 



15. P. Giiadalupcnsis. 



16. P. triflorus. 



17. P. Helleri. 



18. P. Cobaea. 



19. P. grandiflonis. 



20. P. iMuirayanus. 



1. Pentstemon diss^ctus Ell. Puberulent. Stems about 6 dm. tall 

 blades pinnately dissected or pinnatifid above, the segments 7-11 



leaves opposite ; 

 inear, 1-2 mm. wide, 



