452 BOTANY. 



' * Corolla long-cylinclrio, mostly scarlet, lobes short, the upper erect, subincurved, the lower spread- 

 ing, 3-parted. 



5. P. TERNATUS, Torr. Shrubby, glabrous ; leaves linear-lanceolate, verticillate in threes, denticu- 

 late ; sepals lanoe-ovate ; corolla 1' long ; sterile filament strongly bearded throughout. 



6. P. CORYMBOSUS, Eenth. Decumbent ; leaves oblong, narrow at base, obtuse, subentire, pubes- 

 cent ; cyme corymbose ; sepals linear-lanceolate ; sterile filament glabrous or sparingly bearded. 



7. P. CORDIFOLIBS, Benth. Sarmentose or climbing, pruinose-puberulent or glabrate ; leaves ovate 

 and obtuse at base or subcordate, often denticulate or dentate ; sepals ovate-lanceolate ; corolla over 1' 

 long ; sterile filament densely bearded. 



5 3. AMBIGUI, Gray. Subshrubby ; leaves coriaceous ; inflorescence panlcled ; corolla scarlet, di- 

 lated above, lips short, the upper suberect, the lower 3-parted, reflexed ; anthers glabrous, reniform, 

 cells not dehiscing to the base and not expanding. 



8. P. BACCHAKiFOLius, Hoot. W. Texas. 



§ 4. ELMIGERA, Eeioh. Herbaceous, mostly glabrous ; leaves entire, the cauline sessile, lanceolate 

 or linear ; flowers scarlet, in loose virgate panicles, tubular ; anthers glabrous ; cells not dehiscent 

 to the apex and not expanding ; sterile filament naked. 



9. P. BARBATOS, Nutt. Tall ; flowers numerous, strongly bilabiate, lower lip deflexed and usually 

 bearded ; anther-cells widely divaricate. — Mexico. Var. ToRREvr, Gray. Throat of the corolla less 

 bearded or naked, the lips (especially the upper) a little longer. — Colorado to New Mexico. 



§ 5. SPECIOSI, Gray. Herbs, glabrous, (except P. Fr4montii ;) leaves entire, the cauline sessile; 

 flowers blue to purple or violet, in a thyrsoid panicle, broad ventricose above, slightly 2-lipped with 

 equally spreading rounded lobes ; anthers hairy or glabrous, the divaricate cells not dehiscent to 

 the apex and not exiianding. 



10. P. GLABER, Pursh. Leaves glaucous, lanceolate or ovate-lanceolate ; sepals broad-ovate, blunt 

 or more or less acuminate, the margin submembranous ; sterile filament bearded or glabrous. See 

 page 217. 



11. P. CYANANTHTJS, Hook. Lcaves cordate, ovate, acuminate ; thyrse short and dense. See 

 page 217. 



12. P. STEICTUS, Benth. Subglaucous, virgate and slender ; leaves long-linear; panicle narrow with 

 much smaller flowers ; sepals short, obtuse ; anthers very hairy. — Wyoming ; little known. 



13. P. FKfeMONTi, T. & G. Pruinose-puberulent ; lower leaves spatulate, the cauline sessile, lance- 

 olate ; panicle naked, spicate ; sepals oblong-ovate, acute, membranous-margined ; corolla narrow-fannel- 

 form ; anthers and sterile filament sparingly bearded. See page 218. 



5 6. GENUINI, Gray. Herbaceous ; corolla only moderately or scarcely bilabiate, the lips or lobes 



usually spreading ; anthers glabrous or the valves only ciliate, the cells dehiscent the whole length 



and usually expanding. 

 * Glabrous and glaucous, (P. cceivleus excepted;) leaves entire, coriaceous, the cauline sessile or 



clasping ; inflorescence thyrsoid, virgate, the peduncles mostly very short, 3-sev6ral-flowered ; 



corolla dilated above, scarcely bilabiate, with flat spreading lobes. 



(a.) Flowers blue, not 1' long ; sterile filament usually dilated above, yellow-bearded. 



14. P. CJERULBTJS, Nutt. Very low. Usually puberuleut abovc; leaves linear-lanceolate; sepals lance- 

 olate, acuminate, margins commonly ciliolate and membranous. See page 218. 



15. P. ACUMiNATUS, Dougl. 1J° high or less ; cauline leaves lanceolate to subcordate, rigid ; thyrse 

 elongated ; corolla 6-10" long ; sepals ovate or lanceolate ; capsule very sharply acuminate. See page 218. 



16. P. SECUSBIFIORUS, Benth. 1° high or less ; cauline leaves narrowly lanceolate ; cymes more 

 loose and flowers seound.— Rocky Mts. Eeferred by Dr. Gray to the last species, but now regarded as 

 probably distinct. 



(6.) Corolla 1|' long ; upper leaves especially rounded and clasping or perfoliate ; cymelets 2-5-flow- 

 ered with no common peduncle ; sepals not acuminate ; sterile filament with the hooked apex 

 slightly dilated. 



17. P. GEANDiFLORUS, Nutt. 3° high ; leaves distinct ; pedicels short ; corolla blue, abruptly in- 

 flated ; sterile filament scarcely bearded.— Wisconsin to Kansas. 



18. P. MuRKAYANus, Hook. 2-3° high ; upper and floral leaves connately orbicular ; pedicels slen- 

 der ; corolla red, gradually dilated ; sterile filament glabrous.— E. Texas ; Arkansas. 



(c.) Corolla about 1' long, red or scarlet ; leaves below oblong, above subovate or lanceolate, clasp- 

 ing ; usually tall, 



