PENTSTEMON 



8. centranthifdiius, 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. 



FP. Corolla {except in P. rotundifoUus) with a promi- 

 neutlji enlarging tube, which is often contracted 

 near the base: thick-flowered species. Corolla 

 nearly straight, but short in P. confertus. 



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



H. Dehiscence of anther cells extending from base but 

 not through the apex. 



9. gUber, Pursh (P. Gdrdoni, Hook. P. specibsus, 

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



17H. Pentsten 

 caeruleus ( X ^4). 

 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. cyandnthus, Gray (P. eydnthns, 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 



PENTSTEMON 12b9 



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 Ji in. W. Tex. and N. Mex. B.M. 4601. 

 F.S. 7:085. 



12. grandifI6ru8, 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. Murrayinus, 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. Tex. B.M. 3472. Gn. 26, p. 229. R.H. 1896, 



Dougl. Glaucous, strict and usually 

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

 broadly ovate to obovate, the uppernmst laucc-uvate to 

 short-ovate and clasping and uvikiII\ nMn n :(I, . tin- 

 floral Ivs. shorter than the fls. : iiill.in - I ill.- 



peduncles 1-3- or more fld. : IN. ii.ail n 1 - lu 



violet, wide at the throat, tin- ..l.iu>. I - -1 r. :i-iiiiu-; 



sterile filament bearded at the lip. iM... ruer. wc.>i and 

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



jj. Shape of leaves lanceolate to linear. 



15. caenileus, 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. M in. or less long, cream- 

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

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



Var. caeriileo-purptireus, Gray (P. /irdcprK.?, Dougl.). 



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



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



a reliable and satisfactory plant. 



II. Iiifloresreiicr very open and loose, due to the fact 

 that the peiliin'cles are i-6 in. long and the pedi- 

 cels 1 in. or more long and the fls. drooping. 



18. rotundlfdlius. 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. 111. 

 4:205. G.F. 1:473. 



GO. 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. campanuld.tus, 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, stronglv 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 



