SCROPHtLARIACEAE (fIGWORT FiiiMILY) 445 



acumiriate',' abruptlj^ acute or obtuse: corolla loriget^ with more dilated, lesS- 

 bearded throat. {P.^seudoprpcerm Rydb. Mqm., li,; Y. Bot. Gard. 1: 346. 

 1900.) — Northern Wyomihg and Montana. ' '' '" ' 



26. Pentstemon Owenii A. Nels, B6t. Gaz. 34: 32. 1902^ Allied to, the 

 foregoing but the stems lower, obscurely puberulent, 1-2 dm. high: bas&l' 

 leaves crowded, petibled, pblong-elliptic or spatulate; caulinie siiriilar but 

 becoming smaller and narrower: thyrsus glandular-pubescent, crowded, capi- 

 tuliform to short-spicate and somewhat interrupted- verticillate: sepals lanceo- 

 late, scarious-margined," with acuminate green tip: corolla! violet-blue, tubular, 

 12-15 mm. long: sterile filarhent stiffly bearded at tip. — In the high moun- 

 tains; northwestern Wyoming. ' ' ' , . 



27. Pentstemon Rydbergii A. Nels,-, gull. Torr. Bot. Club 25: 281.' 1898;^ 

 Perennial from horizontal rootstocks which give rise at somewhat regular' 

 intervals to vertical branches; from the, crowns of ,thies,e, spring Jong, jijpnder, 

 floriferous stems or very short leafy shoots; glabrous throhghout, 3-5 din. 

 high: radical leaves and those oh the ^terile shoots oblong, obtuse, oh glender" 

 petioles as long as the, blade or longer; c?iuhne leaves few, sessile by a broad 

 base, narrowly oblong; the lowest; pair of bracts leaf -like, trciadly linear: 

 the two or more verticils of the interrupted, spike niany-flowered, the lower 

 one usually distant: sepals scarious, somewhat. lacerate-margiripd: corolla 

 pale blue to p^rple, 12-16 mm. long, the rounded lobes' Of the lower lip 

 reflexed, bearded in the throat: sterile filameht short-bearded. ' (P. erosus 

 Rydb. Bull. Torr. Bot. Club 28: 28,.; l96l.)^Moist copses; Colprado and 

 Wyoming. i , 



, 28. Pentstemon Watsdnii Gray, Syn. Fl. 2: 267. 1886; Glaucescent and 

 glabrous throtighout, or inflorescehce and' calyx minutely puberulent, but 

 neither glandula,r nor viscid; stems 3 dfln,. or more hi^h, a,^cep4ing or weak: 

 cauline leaves oblong-lanceolate, acute or acuminate, 3-5 cm.' long: contracted 

 thyrsus rather loose; peduncles several-flowered, the lower slender; pedicel^ 

 longer than the calyx: sepals broadly ovate or orbicular, with a srnall acumiriaT 

 tion, somewhat scarious^margined, 2-^,mni. long, .^^):ely half, |he length of 

 the mature capsule: corolla narrowly funnelform, 1?-16 mm.' long, violet- 

 purple or partly white; lower lip ahnpst gl^abrous within. — BJountaihs of 

 western Colorado to Nevada. . i . . /, , 



29. Pentstemon humilisNutt. Gray, Proc, , Am. Acad. 6:,,69.'' 1866. , 

 Stems 1-3 dm. high, glabrous- or a-febve with the inflorescence ahd' flowers' 

 viscid-pubescent; leaves dark green or rarely gla|icescent^ oblong to Jahceb^ 

 late, 2-5 cm. ,long; the. cauUhe commonly denticulate: tliyrsus strict and 

 virgate, 5-lQ cm. long; peduncles (2-5-fl9wered) and pedicels short: sepalS' 

 ovate or lanceolate and Eicuminate, lax: corolla rather narrowly funnel- 

 form, 10-14. mm. long, deep blue pi" partly white; lower lip somew;hat hairy 

 within. (F.psmfo/iitmiiis Rydb. Meih. N. Y. Bot. Gard. 1:. 347. 1900.)— 

 In the mounta.ins, rocky cafions, an?! stony slppeS|;| tbf oughoyit oyr range and 

 westward. ' - ' . . ^ ..i ■ .... . . , u . 



30. Pentstemon brevifolius (Gray) A. Nelg. ', Caudex subterranean, woody, 

 freely brancl^ed, the bfanches slender, assurgent; stems slender, weak, some- 

 what fiiffuse, 1-3 dm. long: basal leaves, numerous on thg crpwnp "and, short' 

 sterile branchlets, Buborbicular,,oval, or oblpng, 'entire, thin, 5-25 mm. long; 

 petioles very slehd^f', as Ipifg as the leaves; cauline leaves mostly Sessile ^nd ' 

 oblong spatulate: inflorescence obscurely glandular-pubescent: corolla blue, 

 1 cm. or less. long. (P. kundlis hrevifolius Gray, 1. c.) — In the mountains of 

 Utah. ' - ' .' ' ", ■ , 



31. Pentstemon glaucus Graham, Edinb. Phil. Journ. ,348., 18^9. Glabrous 

 up to the infldrescence,^ mprg or less glaucous; sterns dwarf or' ascending, 

 1-4 dm. high: leaves thickish, oblong-laneedlate or ijhe radical bbloiig-bvate, 

 3-5 cm. long, entire or denticulate: thyrsus short and compact, either simple 

 or compoimd, villpus-pubescent and viscid or glandi^lar: corolla dijU Hlac or 

 violet-puiple, 20-25 mtn. long, campanulate-ventricose above the very short 

 proper ti;be, gibbo,US, , npt at all pMcate-sulcate; the'orifice widely ringeht; 

 the brr-ad lower lip sparsely villous-bearded within: sterile filament bearded 



