PENTSTEMON 



to linear, mostly sessile and clasping: infl. long and nar- 

 row, the pedicles 2-3-fld.; fls. about 1 in. long, scarlet, 

 narrow-tubular, the lobes short and acute; I sterile 

 filament naked. Calif, to W. Ariz. B.M. 5142. B.R. 

 1737. F.S.22:2309. 



FF. Corolla (except in P. rotundi- 

 folius) with, a prominently en- 

 larging tube, which is often 

 contracted near the base: thick- 

 fid, species. Corolla nearly 

 straight but short in P. con- 

 fertus. 

 G. Lvs. entire (sometimes serrulate 



in P. confertus). 

 H. Infl. usually rather close and 



compact. 



i. Some or att the Ivs. lanceolate to 

 broad-lanceolate. 



15. glaber, Pursh (P. Gordonii, 

 Hook. P. specidsus, Douglas). Erect 

 herb (1-2 ft.), with simple sts. gla- 

 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 pur- 

 plish. Missouri River, west. 

 B.M. 1672 (as P. glabra) and 

 4319. B.R. 1270. Gn. 27, p. 

 42. R.H. 1895, p. 383; 1896, 

 p. 347. G.M. 44:563. A 

 very handsome plant, known 

 by its large blue fls. Variable. 



Var. cyananthus, Gray (P. 

 cyandnthus, Hook. P. cydn- 

 thus, Hort.). Tall and less 

 glaucous, the Ivs. broader 

 (ovate or cordate-ovate to 

 lance-ovate) :fl. -cluster dense; 

 fls. bright blue. Rocky Mts., 

 Colo., Mont., Utah. B.M. 

 4464. F.S. 6: 157. R.H. 1851 : 

 453. Preferable to the type. 

 By many considered to be specifically distinct. 



Var. alpinus, Gray (P. alpinus, Torr.). A foot or less 

 high: st. -Ivs. narrow- or broad-lanceolate: thyrse short 

 and few-fld. High plains and mountains, Rocky Mts. 

 Kept distinct from P. glaber by some authors. 



n. Some or att the Ivs. as broad as ovate, oval or obovate. 



16. arizonicus, Heller. St. slender but erect, 6-8 

 in. high, usually with several leafy short prostrate 

 branches at base: Ivs. glabrous, dull green, coriaceous, 

 oval and finely crenate or undulate on prostrate 

 branches, oblanceolate to ovate-lanceolate on the erect 

 sts. and crenate or entire: fls. in a lax more or less 

 secund infl., purplish; calyx nearly %in. long, pubescent 

 and somewhat glandular, the lobes long-acuminate and 

 cilia te; corolla about 1 in. long, minutely puberulent, 

 abruptly dilated above calyx; sterile filament glabrous, 

 not enlarged above. Mt. San Francisco, Ariz. 



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

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

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

 ing rounded lobes, scarlet; sterile filament bearded 

 down one side. N. Mex. R.H. 1892, p. 448. 



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

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

 oblong and clasping: infl. long and loosely fld., to ped- 

 uncles about 2-fld.; fls. about %in. long, bright red, 

 the mouth broad and the rounded lobes spreading %in. ; 

 sterile stamen bearded. W. Texas to Ariz. B.M. 4601. 

 F.S. 7:685. J.F.2:190. 



PENTSTEMON 



2541 



Pentstemon 



grandiflorus. (XJi) 



19. grandifldrus, Xutt. Fig. 2861. 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 flipped and the upper lip the 

 smaller; sterile filament minutely pubescent at the tip: 

 fr. large. Prairies, 111. and Minn., westward. G. 29:82. 

 Handsome. 



20. Murrayanus, Hook. Erect, 3 ft.: 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. Ark., Texas. B.M. 3472. Gn. 26, p. 229. 

 R.H. 1896, p. 348. 



21 acuminatus, Douglas. Glaucous, strict and 

 usually stiffish, 2 ft. or less tall: Ivs. thickish, the lower- 

 most broadly ovate to obovate, the uppermost broad- 

 lanceolate to broad-ovate and clasping and usually 

 acuminate, the floral Ivs. shorter than the fls.: inn 

 narrow, the peduncles 1-3 or more-fld.; fls. nearly 1 

 hi long lilac to violet, wide at the throat, the obtuse 

 lobes spreading; sterile filament bearded at the tip. 

 Neb. and Minn., south and far westward. B.K. L*5. 

 Very satisfactory. There is confusion in the applica- 

 tion of the name P. acuminatus. P. nitidus, Douglas 

 (P. Fendleri, Gray), sometimes referred here, is con- 

 sidered to be a distinct species, with upper Ivs. ovate 

 or narrower. Sask. to Mex., and westward. 



m. Some or att the Ivs. lanceolate to linear. 



22 angustifolius, Pursh (P. caeruleus, Nutt.). Fig. 

 2862. Mostly lower: Ivs. linear to lanceolate, those at 

 the base of the fl.-cluster usually exceeding the fls.: 

 infl. usually close; fls. blue, varying to lilac or white. 

 Dakota to Colo, and New Mex. G.M. 54:377. Seems 

 to run into P. acuminatus. 



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

 row-lanceolate, somewhat 



glaucous, the radical ones 

 spatulate: infl. 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 spread- 

 ing rounded lobes; sterile 

 filament glabrous or bearded 

 only at the top. Colo, and 

 Wyo. Handsome. 



24. confertus, Douglas. One 

 to 2 ft., pubescent in the infl. : 

 Ivs. oblong to lanceolate to 

 linear, usually entire but 

 sometimes minutely serrate: 

 infl. a narrow interrupted 

 spike, the peduncles sessile or 

 the lower ones stalked; fls. 

 J^in. or less long, cream- 

 white to sulfur-yellow, nar- 

 row, 2-lipped, the lower lip 

 bearded within. Rocky Mts. 

 to Ore. and Calif. B.R. 1260. 

 Variable, and has received 

 many names, but little known 

 in cult. 



Var. caeruleo - purpureus, 

 Gray (P. prbcerus, Douglas). 

 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, often kept as specifi- folius. 

 cally distinct. 



2862. Pentstemoc angusti- 

 A slender form. 



