PENTSTEMON 



PENTSTEMON 



1269 



8. centrantliifdlius, Benth. Plant strict and leafy, 

 1-3 ft. tall, very glaucous: Ivs. thick and entire, from 

 ovate-lanceolate to linear, mostly sessile and clasping: 

 inflorescence long and narrow, the peduncles 2-3-fld. : 

 fls. about 1 in. long, scarlet, narrow-tubular, the lobes 

 short and acute; sterile filament naked. Calif, to W. 

 Ariz. B.M. 5142. P.S. 22:2309. 



FF. Corolla (except in P. rotundifolius) with a promi- 

 tutttlfi enlarging tube, which is often contracted 

 tr the base: thick-flowered species. Corolla 

 nearly straight, but short in P. confertus. 



G. Leaves entire (sometimes serrulate in P. confertus). 



H. Dehiscence of anther cells extending from base but 

 not through the apex. 



9. glaber, Pursh (P. Gdrdoni, Hook. P. speciosus, 

 Dough). Erect herb (1-2 ft.), with simple stems, gla- 



<M? 



1713. Pentstemon 

 grandiilorus (X ^ 



1714. Pentstemon 

 caeruleus (X %). 

 A slender form. 



brous and somewhat glaucous : Ivs. oblong-lanceolate 

 to ovate-lanceolate : fl. 1 in. or more long, broad and 

 wide at the mouth, bright blue to purplish. Mo. river 

 west. B.M. 1672 (as P. glabra) and 4319. B.R. 15:1270. 

 Gn. 27, p. 42. R.H. 1895, p. 383; 1896, p. 347. -A very 

 handsome plant, known by its large blue fls. 



Var. cyananthus, Gray (P. cydnthus, Hort.). Tall 

 and less glaucous, the Ivs. broader (ovate or cordate- 

 ovate to lance-ovate) : fl.-cluster dense: fls. bright blue. 

 Rocky Mts. R.H. 1851 :453. Preferable to the type. 



HH. Dehiscence of anther cells extending from the base 



to the very apex and through the junction or 



confluence of the two cells at the apex. 



I. Inflorescence rather close and compact. 



J. Shape of some or all of the leaves as broad as 



ovate or obovate. 



10. puniceus, Gray. Very glaucous, with short ovate 

 sometimes connate Ivs.: fl. about 1 in. long, more fun- 



nelform (or widening upwards) and with wide-spread- 

 ing rounded lobes, scarlet ; sterile filament bearded 

 down one side. Ariz. R.H. 1892, p. 448. 



11. Wrightii, Hook. Rather stout, 2 ft. or less tall, 

 more or less glaucous: lowest Ivs. obovate, the upper 

 ones oblong and clasping : inflorescence long and 

 loosely fld., to peduncles about 2-fld. : fls. about % in. 

 long, bright red, the mouth broad and the rounded 

 lobes spreading % in. W. Tex. and N. Mex. B.M. 4601. 

 F.S. 7:G85. 



12. grandifldrus, Nutt. Fig. 1713. Stout, very glau- 

 cous: Ivs. thick, broad and obtuse, the floral ones with 

 very broad bases : peduncles very short or almost none : 

 fls. nearly or quite 2 in. long, lilac or blue, enlarging 

 near the base, somewhat 2-lipped and the upper lip the 

 smaller; sterile filament minutely pubescent at the tip: 

 fr. large. Wisconsin, south and west. Handsome. 



13. Murray anus, Hook. Erect, 3ft.: Ivs. broad-ovate, 

 clasping, and the upper pairs grown together into a 

 cup-shaped body (connate): pedicels 2-3 in. long: fls. 

 deep scarlet, with rather small lobes; sterile filament 

 glabrous. Tex. B.M. 3472. Gn. 26, p. 229. R.H. 1896, 

 p. 348. 



14. acuminatus, Dougl. Glaucous, strict and usually 

 stiffish, 2 ft. or less tall: Ivs. thickish, the lowermost 

 broadly ovate to obovate, the uppermost lance-ovate to 

 short-ovate and clasping and usually acuminate, the 

 floral Ivs. shorter than the fls. : inflorescence narrow, the 

 peduncles 1-3- or more fld. : fls. nearly 1 in. long, lilac to 

 violet, wide at the throat, the obtuse lobes spreading; 

 sterile filament bearded at the tip. Mo. river, west and 

 south. B.R. 15:1285. Very satisfactory. 



jj. Shape of leaves lanceolate to linear. 



15. caeruleus, Nutt. Fig. 1714. Mostly lower: Ivs. 

 linear to lanceolate, those at the base of the fl.-cluster 

 usually exceeding the fls.: inflorescence usually close: 

 fls. blue, varying to lilac or white. Dakota to Colo. 

 Seems to run into P. acuminatus. 



16. secundifldrus, Benth. About 2 ft. tall: Ivs. nar- 

 row-lanceolate, somewhat glaucous, the radical ones 

 spatulate : inflorescence long and strict, the peduncles 

 1-3-fld. : fls. lilac or purple, the basal tube about twice 

 the length of the calyx, the throat broad and bell-shaped 

 and about equaled by the spreading rounded lobes; 

 sterile filament glabrous or bearded only at the top. 

 Colo. Handsome. 



17. confertus, Dougl. One to 2 ft., pubescent in the 

 inflorescence: Ivs. oblong to lanceolate to linear, usu- 

 ally entire but sometimes minutely serrate : inflores- 

 cence a narrow interrupted spike, the peduncles sessile 

 or the lower ones stalked: fls. % in. or less long, cream- 

 white to sulfur-yellow, narrow, 2-lipped, the lower lip 

 bearded within. Rocky Mts. to Ore. B.R. 15:1260. 



Var. caeruleo-purpureus, Gray (P. prdcerus, Dougl.). 

 Fls. blue-purple to violet. Colo., west and north. B.M. 

 2954. L.B.C. 17:1616. A common form in gardens, and 

 a reliable and satisfactory plant. 



ii. Inflorescence very open and loose, due to the fact 

 that the peduncles are 3-6 in. long and the pedi- 

 cels 1 in. or more long &nd the fls. drooping. 



18. rotundifolius, Gray. About 2 ft. tall, branching 

 from the base, glaucous: lower Ivs. thick and leathery, 

 orbicular-ovate and obtuse, long-petioled, stem-lvs. ses- 

 sile and cordate-orbicular: fls. 1-1 % in. long, narrow- 

 tubular, yellow-red, the lobes short and acute; sterile 

 filament glabrous. Northern Mex. B.M. 7055. G.C. HI. 

 4:265. G.F. 1:473. 



GG. Leaves serrate or dentate. 

 H. Sterile filament bearded at the tip or along 



one side. (HH. No. 26.) 



i. Color of fls. purple, blue or rose, incidentally rang- 

 ing to white. 



19. campanulatus, Willd. Branching from the base, 

 2 ft. or less tall: Ivs. lanceolate or the upper ones ovate- 

 lanceolate, long-acuminate, broad at the base and ses- 

 sile, strongly serrate: inflorescence long and narrow, 

 the peduncles usually 2-fld. : fls. 1 in. long, rose-purple, 

 the narrow base of the tube about the length of the 



