APPENDIX. 453 



19. p. CENTRANTiiiFOLUTs, Bentli. Sepals broad-ovate ; corolla crimson, tubular, scarcely dilated, 

 with a short equal limb ; sterile filament glabrous. See page 219. 



20. P. PUNICEUS, Gray. Cymelets rather dense; sepals ovate or oblong; corolla bright scarlet, 1' 

 loDg or less, tubular, the throat slightly dilated, lobes broad, rounded, subequal ; sterile filament bearded 

 at top. — Arizona and Sonera. 



21. P. Weightii, Hook. Panicle loosely virgate, cymelets few-flowered ; sepals oblong, the tips 

 spreading ; corolla less than 1' long, bright rose-red, ventricose above, with broad rounded wide-spread 

 lobes ; sterile filament densely long-bearded.— W. Texas, Arizona. 



* * Glabrous, subglaucous, tall ; leaves crowded, oblong or ovate-lanceolate, coriaceous, the upper 

 connate; panicle loose, elongated, cymelets 3-9-flowered and peduncled; corolla 1' long, blue-pur- 

 ple, inflated above, bilabiate with very broad and spreading lobes ; sterile filament glabrous. 



22. P. SPECTABILIS, Thurb. \V. Texas to California. 



* * * Glabrous or nearly so ; leaves pinnately parted with narrow-linear segments ; panicle loose ; 

 corolla purple, not 1' long, dilated above, lobes subequal ; sterile filament bearded at top. 



2.3. P. DisSECTUs, Ell. Georgia. 



* * * * Glabrous or pruinose- or viscid-puberulent ; leaves filiform-subulate, linear or linear-spatu- 

 late, entire ; flowers in a simple raceme or loose virgate panicle. 



(a.) Inflorescence strictly racemose ; corolla scarcely bilabiate. 



(1.) Leaves almost filiform, glabrous. 



24. P. LARICIFOLIUS, H. & A. 6' high, caispitose ; leaves crowded at base ; flowering stems slender, 

 simple; raceme 4-8-flowered; corolla i' long, purple, tube dilated above; sterile filament bearded.— 

 S. Idaho. 



25. P. AMBIGUITS, Torr. 1-2° high, woody at base, paniculately branched ; lower leaves linear, nar- 

 rowed at base ; racemes loose ; corolla 5-8" long, purplish-white, the limb broad and spreading, the tube 

 but little dilated and bearded in the throat ; sterile filament glabrous, at times antheriferous. — Colorado 

 to New Mexico and Arizona. 



(2.) Leaves linear-lanceolate or linear-spatulate, puberulent or pruiuose-pubesoeut ; stems woody at 



26. P. Gaikdnbri, Hook. Much branched at base, a span high ; pedicels short, somewhat opposite ; 

 sepals glandular- viscid; corolla i' long; sterile filament bearded. — Washington Territory. 



27. P. dasyphyixus. Gray. Stem subsimple ; raceme loosely few-flowered, the pedicels alternate ; 

 corolla purplish-blue, nearly IJ' long ; sterile filament glabrous. — Arizona and New Mexico. 



(6.) Peduncles mostly 2-5-flowered, forming a racemose or virgate panicle; sepals ovate; stems erect, 



usually simple. 

 (1.) Stems 2-3° high ; peduncles opposite, elongated, 2-5-flowered, in a rather loose panicle ; corolla 



blue, (or purple,) IJ' long, dilated above. 



28. P. STENOPHYLLUS, Gray. Glabrous; leaves linear, the lower ones 3-4' long; sterile filament 

 glabrous. — Mexico, Arizona. 



(2.) Stems -^-1^° high, usually very minutely pruinose-pubernlent ; peduncles and pedicels short ; 

 corolla purple, short-bilabiate, over i' long, much dilated above. 



29. P. viEOATDS, Gray. Very simple at base; leaves l|-4' long, linear or linear-lanceolate ; pedun- 

 cles mostly opposite in a very narrow elongated panicle ; sterile filament glabrous. — New Mexico. 



30. P. LINARIOIDBS, Gray. Many-stemmed from a woody base, very leafy ; leaves 1' long or less, 

 spatulate-linear to subulate ; peduncles alternate ; panicle narrow, subsecund ; palate and sterile fila- 

 ment bearded. — New Mexico and Arizona. 



(c.) Flowers axillary upon the csespitose-depressed branches, which are leafy to the summit. 



31. P. C^SPITOSUS, Nutt. Flowers secund, 6-9" long. See page 219. 



***** Pruinose- or viscid-pubescent, or with serrate leaves, or with an interrupted panicle of 

 densely-flowered cymelets ; inflorescence usually thyrsoid ; corolla never red or scarlet. 



(a.) Sterile filament longitudinally yellow-bearded ; corolla campanulate or broad funnelform above, 

 slightly bilabiate. 



(1.) Leaves lanceolate, subentire, the upper ones at least and the flowers viscid-pubescent ; panicle 

 strict, with short appressed peduncles. 



32. P. PUMILUS, Nutt. Dwarf, few-flowered, the cauline leaves a little narrowed at base; corolla 

 somewhat glabrous. — S. Idaho. 



