454 BOTAIIY. 



33. P. ALBIDUS, Nutt. 1° high; leaves often oblong- or ovate-lanceolate; the spicate panicle sub- 

 verticillately interrupted ; sepals lanceolate, very viscid-puhescent ; corolla f ' long, purplish-white, mod- 

 erately dilated, the limb beardless ; beard of the sterile filament rather short, subinterrupted. — Upper 

 Missouri to W. Texas. 



34. P. CRISTATUS, Nutt. Sepals attenuate, very hirsute ; corolla 1' long, violet, broadly dilated, the 

 lower lip and sterile filament long-bearded. See page 219. 



35. P. Jambsii, Benth. 4'-l° high, puberulent ; leaves linear-lanceolate, often denticulate, rigid ; 

 cymelets 3-4-flowered in a spicate panicle; sepals viscid-puberulent; corolla 1' long or more; pale purple, 

 abruptly campanulate above, the lip and sterile filament less bearded. — Colorado to New Mexico and 

 Texas. 



(2.) Leaves broader, usually serrate, the cauline mostly clasping; panicle nsually naked, loose- 

 flowered. 



36. P. CoBiEA, Nutt. 1-2° high, viscid-puberulent ; leaves ovate or oblong, sharply serrate or den- 

 ticulate ; the few-flowered panicle and oblong scarcely acute sepals viscid-pubescent ; corolla 2' long, 

 purplish-white, abruptly campanulate above, glabrous within ; sterile filament bearded. — Kansas to 

 Texas. 



37. P. Palmeei, Gray. 2-5° high, glaucous ; leaves ovate or oblong-lanoeolate, sharply toothed ; 

 panicle glandular-puberulent ; sepals ovate, smoothish ; corolla 1^' long, very broad campanulate above ; 

 sterile filament densely bearded. See page 220. 



38. P. DIGITALIS, Nutt. 3-5° high, usually glabrous except the viscid flowers; leaves 3-6' long, 

 lanceolate or the upper ovate-lanceolate, serrulate ; corolla white, over 1' long, dilated above the narrow 

 tube, the lobes short ; sterile filament sparingly bearded. — Georgia and Florida. 



39. P. TUBIFLORUS, Nutt. Slender ; corolla tubular-fnnnelform ; filament less bearded. — Arkansas. 



(6.) Sterile filament longitudinally yellow-bearded, at least along the dilated apex ; corolla less di- 

 lated, (except P. glaueus,) more evidently bilabiate ; inflorescence not in crowded clusters. — East 

 of the Sierras. 



(1.) Many-flowered ; the naked panicle thjrsoid or racemose, the peduncles usually 3-several-flow- 

 ered; leaves sharply serrulate or subentire, the upper bract-like; upper lip commonly slightly 

 shorter. 



40. P. PUBERCENS, Soland. 1-3° high, viscid-pubescent or nearly glabrous ; leaves lanceolate ; co- 

 rolla purplish-white, a little dilated above, slightly obcompressed, with two folds under the lower lip, the 

 throat somewhat closed ; sterile filament densely long-bearded.— From Canada and the Saskatchewan to 

 Florida and Texas. 



41. P. HDMiLis, Nutt. Low and subglabrous ; thyrse more strict ; corolla deep-blue, y long ; throat 

 dilated and without folds. See page 220. ' 



42. P. GLAUCUS, Grab. Glabrous, except the viscid- pubescent inflorescence ; corolla 1' long, ventri- 

 cose above the base, without folds. See page 221. 



43. P. Hallii, Gray. Dwarf; stems numerous; glabrous except the very minutely glandular inflo- 

 rescence ; leaves entire, linear-spatulate or linear ; raceme simple, 4-10-flow6red, with short pedicels ; 

 sepals ovate or oblong with scarious and often erose margins ; corolla deep-blue, about 1' long, ventri- 

 cose-campanulate above the short base, the lips short ; sterile filament short-bearded. — Colorado. 



(2.) 2-3-flowered ; stems leafy to the summit ; peduncles 1-flowered. 



44. P. Hahbouei, Gray. Dwarf; stems many, pruinose-puberulent ; leaves entire, ovate or oblong, 

 obtuse ; sepals viscid-pubescent, not scarious ; corolla 7-9" long, purple, the tube slightly dilated, throat 

 and sterile filament bearded. — Colorado. 



(c.) Sterile filament bearded at the top ; corolla bilabiate, the tube scarcely or not at all dilated ; 

 panicle interrupted, the cymelets crowded ; flowers 5-8", rarely 9-11" long. 



(1.) Leaves ovate or ovate-lanceolate, usually sharply dentate, the upper subcordato at base, clasp- 

 ing ; sepals scarcely scarious on the margins ; flowers less crowded. 



45. P. ovATus, Dougl. Puberulent ; leaves broad ; sepals ovate or broad-lanceolate.— Oregon to 

 British Columbia. 



46. P. PEUINOSUS, Dougl. Pubescent ; leaves caisious ; the often subverticiUate inflorescence and 

 lanceolate acuminate sepals viscid-villous. — Oregon. 



(2.) Leaves glabrous, usually entire, lanceolate or oblong ; sepals scarious, at least on the margins ; 

 palate usually bearded ; the spike-like thyrse subverticillately interrupted. 



47. P. ATTBNUATus, Lindl. 1^-2° high, leaves rarely few-toothed; inflorescence villous or viscid- 

 pubescent; cymes mostly short-peduncled ; sepals ovate-lanceolate, narrowly scarious; corolla over +' 

 long.— N. Idaho. 



