GENUS 9. 



FIGWORT FAMILY. 



8. Pentstemon calycosus Small. Long-sepaled 

 Beard-tongue. Fig. 3762. 



Pentstemon calycosus Small, Bull. Torr. Club 25 : 470. 

 1898. 



Glabrous except a few scattered hairs in the in- 

 florescence and lines of puberulence on the inter- 

 nodes, deep green. Leaves various, the basal spatulate, 

 2 r -6' long, entire or undulate, with winged petioles; 

 lower stem-leaves similar to the basal, the upper lan- 

 ceolate or ovate-lanceolate, acute or acuminate, finely 

 repand or distinctly serrate, rounded at the base and 

 clasping; calyx-segments with a lanceolate base and 

 a slender tip, often becoming 5" long; corolla purple, 

 I2"-I5" long; sterile filament sparingly bearded. 



On bluffs. Kentucky to Missouri, Alabama and Arkan- 

 sas. May-June. 



9. Pentstemon gracilis Xutt. Slender 

 Beard-tongue. Fig. 3763. 



Pentstemon gracilis Nutt. Gen. 2: 52. 1818. 



Glabrous or very nearly so up to the glandular- 

 pubescent inflorescence ; stem slender, strict, 6'-i8' 

 high. Basal and lower leaves linear-oblong or 

 spatulate, mostly obtuse, denticulate, or entire, 

 i '-3' long, narrowed into margined petioles; upper 

 leaves sessile, linear-lanceolate or the uppermost 

 lanceolate, acuminate, denticulate; thyrsus open, 

 several-many-flowered; pedicels 2 "-4" long; ca- 

 lyx-segments lanceolate, acute or acuminate ; co- 

 rolla purple, g"-i2" long, its tube gradually en- 

 larged above, its throat wide open ; sterile filament 

 bearded for about one-half its length; capsule one- 

 third longer than the calyx. 



On moist prairies, Manitoba to Minnesota, Mis- 

 souri, Athabasca, Oklahoma and Colorado. May-July. 



10. Pentstemon tubiflorus Nutt. Funnel- 

 form Beard-tongue. Fig. 3764. 



Pentstemon tubiflorus Nutt. Trans. Am. Phil. Soc. 

 (II.) 5: 181. 1833-37. 



Glabrous, except the viscid-pubescent calyx and 

 pedicels; stem slender, strict, 2-3$ high, leafless 

 above. Leaves oblong, ovate, or lanceolate, i'~4' 

 long, obtusish or acute, the basal narrowed into 

 broad margined petioles, the upper sessile or clasp- 

 ing, entire or merely undulate; thyrsus narrow, 

 interrupted, the clusters several-flowered ; pedicels 

 i"-3" long, calyx-segments ovate, acuminate, short, 

 striate-nerved ; corolla nearly funnelform, white 

 or purplish, less than i' long, nearly as broad 

 when expanded, its tube gradually enlarged, the 

 limb nearly equally five-lobed, the lobes spread- 

 ing; sterile filament short bearded above; capsule 

 ovoid, acute, about twice as long as the calyx. 



In moist soil, Missouri, Kansas and Arkansas. 

 May-July. 



