RHINANTHACEAE 1061 



blades ; upper stem-leaves few, the blades oblong, lanceolate or linear-lanceolate, rather 

 remotely toothed, partly clasping : panicles narrow : calyx-lobes ovate, becoming triangu- 

 lar, acute, closely puberulent or pubescent during anthesis : corolla white or purplish, 

 2-2.5 cm. long ; tube rather gradually dilated, the throat sparingly bearded: staminodium 

 bearded with very short hairs : capsules ovoid with aflat base. 5-6 mm. long, much surpass- 

 ing the calyx. 



In sandy^soil or swamps, New York to Missouri, Georgia and the Indian Territory. Spring. 



10. Pentstemon multiflorus Chapm. Stems merely puberulent below the inflores- 

 cence, 4-12 dm. tall. Basal and lower stem-leaves with spatulate or oblong blades nar- 

 rowed into petiole-like bases ; upper stem-leaves few; blades narrowly oblong to oblong- 

 lanceolate, obtuse, entire or undulately toothed, manifestly decurrent on the stem : panicle 

 often amjjle and many-flowered : calyx-lobes glandular-pubescent, ovate, 3-4 mm. long, 

 obtuse : corolla white, about 1.5 cm. long, glabrous or nearly so in the throat : staminodium 

 sparingly beai'ded near the tip or nearly glabrous : capsules conic, 8-10 mm. long, rather 

 narrow at the base, abruptly constricted at the apex, usually fully twice as long as the calyx. 



In pine lands, Florida. Spring and summer. 



11. Pentstemon Mackayanus Knowles & Westc. Stems minutely puberulent. 

 Leaves bright green ; blades various, those of the basal and lower stem-leaves lanceolate or 

 ovate to oblong ; those of the upper stem-leaves lanceolate or broadly lanceolate, acute or 

 somewhat acuminate, irregularly serrate, partly clasping by the dilated bases : panicle open : 

 calyx-lobes ovate to oblong-ovate, merely acuminate, 4-5 mm. long, sparingly pubescent : 

 corolla purple without, 1.5-2 cm. long ; tube funnelform, sparingly bearded in the throat : 

 staminodium rather copiously bearded : capsules not seen. 



In open woods, Texas. Spring. 



12. Pentstemon Smillii Heller. Stems puberulent below the inflorescence, 3-12 

 dm. tall. Basal leaves with ovate or oval coarsely toothed blades abruptly narrowed into 

 margined petioles ; upper stem-leaves few ; blades lanceolate to ovate-lanceolate, succes- 

 sively broader at the base, 8-15 cm. long, often acuminate, regularly and rather finely 

 toothed, clasping : panicle secund : calyx-lobes lanceolate or oblong-lanceolate, 5-6 mm. 

 long, acute or acuminate : corolla showy, pink-purple, strijjed with white especially within, 

 2.5-3 cm. long ; tube abruptly dilated near the middle, with long yellow hairs in the 

 throat : staminodium bearded to the base : capsules ovoid, 8-10 mm. long, often twice as 

 long as the calyx. 



On mountain slopes and river bluffs, North Carolina and Tennessee. Spring. 



13. Pentstemon tenuis Small. Stems 4-6 dm. tall, puberulent. Stem leaves oppo- 

 site ; blades oblong to oblong-lanceolate or ovate, 6-10 cm. long, acute or acuminate, 

 sharply serrate-dentate, partly clasping : panicles open, rather few-flowered : calyx-lobes 

 minutely glandular-pubescent, 4-5 mm. long, becoming 7 mm. at maturity, lanceolate, with 

 attenuate spreading or recurving tips: corolla purplish, barely 1.5 cm. long, glandular; 

 tube hardly dilated, but with a slight gibbosity near the middle : sterile filament bearded 

 above the middle : capsules broadly ovoid, about 5 mm. high, surpassed by the calyx. 



In woods and thickets, Alabama and Louisiana. Spring. 



14. Pentstemon dlbidus Nutt. Foliage dark green, puberulent or somewhat ca- 

 nescent above, viscid. Stems tufted, 1-3 dm. tall : basal and lower stem-leaves with oblong 

 or spatulate blades; upper stem-leaves lanceolate, sometimes narrowly so, not lustrous, 

 entire or shallowly toothed, sessile : panicle raceme-like, the main branches more or less 

 suppressed, the cymes clustered : calyx-lobes lanceolate, 6-8 mm. long, densely viscid- 

 pubescent : corolla white or purple-tinged, about 1.5 cm. long, the lips spreading: stami- 

 nodium bearded : capsules ovoid, about 10 mm. long, smooth. 



On sand hills or plains, Assiniboia to Kansas, Texas and Colorado. Spring and summer. 



15. Pentstemon Guadalupensis Heller. Foliage bright green. Stems tufted, 1-4 

 dm. tall, puberulent: basal and lower stem-leaves with linear or nearly linear often elon- 

 gated blades ; upper stem-leaves numerous, approximate ; blades linear-lanceolate to lanceo- 

 late, 2-6 cm. long, entire or nearly so, lustrous, sessile : panicle raceme-like, viscid-pubes- 

 cent : calyx-lobes lanceolate or ovate-lanceolate, 5-7 mm. long : corolla Avhite or tinged 

 with purple, about 1.5 cm. long, sparingly glandular-pubescent : staminodium bearded to 

 about the middle : capsules ovoid, about 10 nnn. long, veiny. 



In stony soil, central Texas. Spring. 



16. Pentstemon triflorus Heller. Glabrous or nearly so to the inflorescence. Stems 

 3-9 dm. tall : basal and lower stem-leaves with spatulate or oblong almost entire blades 

 narrowed into margined petioles ; ujiper stem-leaves oblong to ovate, mostly acute, 3-10 

 cm. long, successively more sharply and deeply toothed, partly clasping : peduncles usually 



