276 SCROPHULARIACEJE. (FIG WORT 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. caeruleus, 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-lilac or white : sterile 

 filament much bearded above. Plains of Dakota and Montana to Colorado. 

 H- -t- Puberulent or pubescent and above viscid or glandular : leaves from oblong 



to lanceolate-linear, entire or the margins undulate : thyrsus racem[form : 

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

 dilated into the campanulate or broadly funnel form 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 funnelform, being less ab- 

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

 inordinately yellow-bearded. From Dakota to Nevada and S. Colorado. 



H_ H_ M_ 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, 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 Dakota 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. 



is. 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 erose, sometimes with a long herbaceous acumination : 

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



