PENTSTEMON 



8. centranthifolius, Benth. Plant strict tuu\ h-.ity. 

 1-3 ft. tall, very glaiiom,<: Ivs. tlii.k aii.l rntirr. from 

 ovate-lanceolate to lin.-:u-. mo-^ih ^r--il.' ami I'lii-pni-: 

 inflorescence long an<i n.-ifT-^w . tln' |-riiiMi''li^ J :mM.: 

 Hs. about 1 in. long. mmiI.-i. nariMw tul.ul.n'. ihr |,.i„s 

 short and acute; sttrik- lihum.ut iiaktU, Calif, tu \V. 

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



KF. Corolla (except in P. rotundifoUus) with a promi- 

 nenthi enlarginq tube, which is often contracted 

 near thr hns-r: fhicl:f!nim-rrl xpecies. Corolla 

 neai-hi stnn.iht. Imt slmrl in J', roufertus. 



G. Leaves rill lr< \x,,iiutliins s, rnilaii in P. confertus). 



II. Dehisrenr, i,l aiillirr f,lls ..rliiirliiiii from hase but 

 not throiujh the apex. ' 



9. gl4ber, Pursh (P. GSrdoiii, Hook. P. .ipecidsus, 

 Dougl.). Erect herb (1-2 ft.), with simple stems, s'a- 



PENTSTEMON 



1269 



1714. Pentstemon 

 csruleus (X '4). 

 A slender form. 



rs. oblong-lanceolate 

 >re long, broad and 

 [■urplish. Mo. river 

 i:il9. B.R. 15:1270. 

 >'.«;, p. 347.— A very 



lirous and somewhat glaucous 

 to ovate-lanceolate: fl. 1 in. o 

 wide at the mouth, brit^lit blue 

 west. B.M. 1072 (as /'. .,lul,r„i 

 On. 27, p. 42. R.It. In'.':., ].. :is 

 handsome plant, known l)y it.- lar^i' blue tls. 



Var. cyanAnthus, Uray (P. rt/dnthiis, Hort.). Tall 

 and les.s trlauf'us, tlie Ivs. broader (ovate or cordate- 

 ovate to lanci-ovate) : M. -cluster dense: fls. bright blue. 

 Koeky Mts. K.H. IbOI : 453. —Preferable to the type. 

 IIH. Dehiscence of anther cells extending from the hase 

 to the very apex and through the junction or 

 confluence of the two cells at the apex. 

 I. Inflorescence rather close and compact. 

 .T. Shape of some or all of the leaves as ttroad as 



ovate or obovate. 



111. pvmlceuB, 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 beardeti 

 down one side. Ariz. B.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.: tis. about % in. 

 long, bright red, the mouth broad and the rounded 

 lobes spreading % in. W. Tex. and N. Mex. B.M. 4001. 

 F.S. 7:085. 



12. grandifl6rus, Xuti. Fi;,-. 1713. Stout, very glau- 

 cous: Ivs. thick, bioail .njil ..I. fuse, the floral ones with 

 very broad bases: i.c.lunclis very .short or almost none: 

 fls. nearly or quit. -J in. Imh-, filac or bhie, enlarging 



near the 



fr. large. 

 13. Mu 

 clasping', 

 cup-slKi|i 

 deep sia! 



p. 348. 



the 



iite): pedicels 2-3 in long: fls. 

 ■r small lobes; sterile filament 

 172. Gn. 26, p. 229. R.H. 1890, 



14. acuminituB, Dougl. Glaucous, strict and usually 

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

 broadly ovate to obovate, the uppermost lance-ovate to 

 short fivate ami clasyiing and usually acuminate, the 

 flora I Ivv. -Ihitc V t hail the fls.: inflorescence narrow, the 

 lie.luiiri, V 1-:; Ml- 111 or.- Hd.: fls. nearly 1 in. long, lilac to 

 violet, wjiii. ai tlie iliioat, the obtuse lobes spreading; 

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

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



jj. Shape of leaves lanceolate to linear. 



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

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

 ii-ually exceeding the fls.: inflorescence usually close: 

 Us. blue, varying to lilac or white. Dakota to Colo.— 

 Seem- to run into P. acuminatus. 



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

 row-lanceolate, somewhat glaucous, the radical ones 

 spatulate: inflorescence long and strict, the peduncles 

 l-3-rt(i.: fls. lilac or purple, the basal tube about twice 

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

 ualed l)y the spreading rounded lobes; 



.-Handso 



confpr 



ent glabr 



bearded only at the to 



L'l One to 2 ft., pubescent in the 

 infloie- ' long to lanceolate to linear, usu- 



ally en' imes minutely serrate: inflores- 



cence a I ,; , i[.ted spike, the peduncles sessile 



or the 1 . , . 1. .i.eil: fls. %. in. or less long, cream- 



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

 bearde.l will, in. ' Rocky Mts. to Ore. B.R. 15:1200. 



Var. caeruleo-purpdreuB, Gray (P. 7«'dc(?»-Hs, Dougl.). 

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

 2954. L.B.C. 17:1010.— A common form in gardens, and 

 a reliable and satisfactory plant. 



II. Inflorescence very open and loose, dite to the fact 

 Ihnt the piihin'clrx are ^-liiti. '■•vi ■'ii,1 <lir pedi- 

 f: Is 1 ill. or miirr l„li,l -.unl !■■ " -' ;-"■/. 



18. rotundiSblius, Gray. Alioni . !i li! '<■: mrbing 



orbicular-ovate and obtu.se, long-|H iioli il, rtUin l\s. ses- 

 sile and cordate-orbicular; fls. l-U-i in. long, narrow- 

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

 filament "glabrous. Northern Mex. B.M. 7055. G.C. III. 

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



GO. Leaves serrate or dentate. 



H. Sterile filament bearded at the tip or along 



one side. (hh. No. 26.) 



I, Cohir III tls. purple, blue or rose, incidentally rang- 



19. campanuiatus, 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 



