276 SCROPIIULARIACEiE. (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, Xutt. 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-lilac or white : sterile fila- 

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

 +- 4- Puberulent or pubescent and above viscid 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 funnelf or m throat. 



11. P. Jamesii, Benth. Pruinose-puberulent : 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 oblong: corolla more funnelf or m, 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. 

 ■t- 4- -H- Puberulent or viscid-pubescent, at least the inflorescence, or sometimes 



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



campanulate-ventricose above : sepals usually narrow or acuminate. 



++ Leaves from ovate to lanceolate, undivided : stems erect or ascending : thyrsus 



mostly many flowered. 



= Corolla hardly at all bilabiate, funnel form, 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. deustUS, Dougl. 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. eonfertUS, Dougl., var. cseruleo-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 erose, sometimes with a long herbaceous acumination: 

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



