276 SCROPHULARIACEJE. (FIGWORT FAMILY.) 



to violet : sterile filament mostly bearded at the dilated tip. — From the Sas- 

 katchewan and Upper Missouri to Oregon, New Mexico, and W. Texas. 



10. P. cseruleus, Nutt. Like the last, but low : leaves all from lanceolate 

 to narrowly linear: thyrsus spiciform and usually dense: sepals lanceolate- 

 acuminate : corolla blue, varying occasionally to rose-liiac or white : sterile fila- 

 ment much bearded above. — Plains of the Uakotas and Montana to Colorado. 

 h- h- Puberulent or pubescent and aboce ciscid or glandular : leaves from oblong 



to lanceolate-linear, entire or the margins undulate: thyrsus racemiform : 

 corolla ample, purplish ; its tube little if any longer than the sepals, abruptly 

 dilated into the campanulate or broadly funnel) "or in throat. 



11. P. Jamesii, Benth. Pruinose-puberulenl : leaves all narrowly or 

 linear-lanceolate : corolla abruptly dilated into a broadly cyathiform-campanulate 

 throat, a little hairy within : sterile filament moderately bearded. — Prairies, S. 

 Colorado to New Mexico and W. Texas 



12. P. cristatus, Nutt. Pubescent, or above viscid-villous : leaves from 

 linear-lanceolate to narrowly obloDg: corolla more funnelform, being less ab- 

 ruptly dilated ; its lower lip long-villous within : sterile filament more exserted, 

 inordinately yellow-bearded . — From the Dakotas to Nevada and S. Colorado. 

 -i- -i- -i- Puberulent or viscid-pubescent, at least the inflorescence, or sometimes 



glabrous: leaves various : corolla from 4 lines to an inch long, not abruptly 



campannlate-ventricose above : sepals usually narrow or acuminate. 



*-*■ Leaves from ovate to lanceolate, undivided : stems erect or ascending : thursus 



mostly many-flowered. 



= Corolla hardly at all bilabiate, funnelform, with widely spreading lobes, 



whitish or tinged with purple. 



13. P. albidus, Nutt. Viscid-pubescent, 6 to 10 inches high: leaves 

 oblong-lanceolate or narrow, entire or sparingly denticulate : thyrsus strict, 

 leafy below, of approximate few to several-flowered clusters : sepals densely viscid- 

 pubescent, 3 or 4 lines long : corolla with shorter tube, the rather ample limb 

 about as broad. — On the plains from the Dakotas to Colorado and Texas. 



14. P. doustus, Lougl. Completely glabrous, or the calyx obscurely 

 glandular, a span to a foot high in tufts from a woody base, rigid : leaves 

 coriaceous, from ovate to oblong-linear or lanceolate, irregularly and rigidly 

 dentate or acutely serrate, or some of them entire : thyrsus virgate or more 

 paniculate, mostly many-flowered : corolla narrowly or broadly funnelform, 

 half-inch or less long. — In the interior from California to British Columbia 

 and eastward into Montana. 



= = Corolla more plainly bilabiate ; lower lip usually somewhat bearded or 

 pubescent within. 



15. P. confertus, Dougl., var. caeruleo-purpureus, Gray. Gla- 

 brous throughout, or the inflorescence and calyx viscid-pubescent or puberu- 

 lent, from 2 inches to 2 feet high : leaves from oblong or oblong-lanceolate to 

 somewhat linear, usually entire : thyrsus spiciform, interrupted, naked, of 2 to 

 5 dense verticillate flower clusters, or in the low mountain forms with capituli- 

 form inflorescence : pedicels very short : sepals variable, usually broad, com- 

 monly very scarious and erase, sometimes with a long herbaceous acuminatum ; 

 corolla narrow, 4 to 6 lines long, blue-purple and violet ; lower lip canspicvr 



