ORDER 86. -SCROPHULARIACE^E. 521 



1 P. dissectus Ell. Minutely puberulent; Ivs. pinnately parted, segm. linear, 

 entire or few-lobed ; panicle loose, with long, few-flowered peduncles ; cor. some- 

 what bell-shaped, sterile filament bearded at the apex. In Middle Ga. St near 

 2f high. Leaf-segm. distant, rather obtuse, margins revolute. Cor 9 to 10" long, 

 purple, resembling that of Gerardia, but curved. Jn., JL Blackens in drying. 



2 P. grandiflorus Fraser. Erect, glabrous and glaucous ; radical Ivs. petiolate, 

 obovate-oblong, cauline broadly ovate or orbicular, sessile or clasping, all entire; 

 panicle long, slender and racemous, interrupted ; cor. broadly campanulate ; ster- 

 ile fiL dilated and puberulent at apex. 111., near Prairie du Chien (Riddell) and 

 westward. St. 3f high. ^Fls. 1 to 3 together in the upper axils. Cor. 15" long, 

 variously shaded with blue and purple. 



3 P. pubescens Soland. More or less pubescent; radical Ivs. ovate or oblong, 

 petiolate, cauline lanceolate-oblong or lance-ovate, serrulate, sessile; panicle 

 loose ; cor. tube gradually dilated, lower lip plaited and bearded inside, upper lip 

 shorter : sterile stam. longitudinally bearded. River banks, bluffs, hills and bar- 

 rens, Can. to Fla. (rare in N. Eng.). A handsome plant, 1 to 2f high. St. round, 

 smooth below, supporting a loose, oppositely branched panicle of bluish-purple 

 fls. Cor. 1' in length; the barren fiJ. broadest at end. Jn. 



/?. I^EVIGATUS. Nearly or quite glaWrous; Ivs. clasping; sterile fil. shorter. 



4 P. gracilis Nutt. Glabrous; radical Iva petiolate, elliptic-oblong or lance- 

 oblong, cauline linear lanceolate, amplexical, entire or remotely serrulate ; panicle 

 pubescent, slender; ped. erect; cal. segm. ovate-lanceolate, acuminate; cor. tube 

 long and narrow, scarcely dilated upwards, smooth inside ; sterile stam. longitudi- 

 nally bearded. River bottoms, near Chicago, 111. (Mead), also Mo. and Can. W. 

 Plant simple, glaucous, 2f high. Ped. 3 to 7-flowered. Fls. nodding, 9 to 10" 

 long, pale blue. Jn. 



5 P. digitalis Nutt. Glabrous; radical Ivs. petiolate, oval-elliptic or oblong, 

 cauline lanceolate, amplexicaul, serrate, or rarely entire; panicle loose; ped. 

 erect, spreading; cor. tube abruptly campanulate-dilated, beardless, upper lip 

 shorter than the lower ; sterile sta. longitudinally bearded. Rich soils, Ohio, Ind. 

 to Ga. and La. St. about 3f high. Lvs. 4 to 6' long, often dilated at base. Fla. 

 numerous. Cor. 12 to 15'' long, bluish-purple, varying to white. Jn., Jl. 



6 P. campanulatus "Willd. Glabrous; Ivs. acutely serrate, lance-linear or 

 lance-ovate, long-acuminate, often dilated" at base ; panicle long, loose and secund ; 

 cor. tube ventricous above, lobes subequal; sterile fil. bearded. A very variable spe- 

 cies, 2 to 3f high, with large flowers, varying from light purple to dark red or 

 purple, f Mexico. 



7 P. barbatus Nutt. SCARLET PENT. Glabrous and glaucous ; Ivs. entire, 

 lower oblong, upper lance-linear ; panicle long and loose ; cor. tube long, scarcely 

 dilated upwards ; lower lip and sterile fil. densely bearded. Height 2 to 4f. Cor. 

 scarlet, 13" long, f Mexico. 



8 P. speciosus Doug. Erect, glabrous, glaucous; radical Ivs. petiolate, 

 oblong-spatula te, cauline sessile, lanceolate; panicle elongated, slender, virgate, se- 

 cund; caL segm. ovate-oblong, acuminate, margin membranous; cor. tube en- 

 larged upwards ; sterile fil. filiform, glabrous. Height 3 to 4f. Fls. 1^' long, 

 blue, f Oregon. 



9 P. gentianoides, with thepanick long, leafy at base; fls. 15 to 18" long, 

 violet, scarlet, &c., and a few other species are rarely found in gardens. 



12. COLLIN'SIA, Nutt. INNOCENCE. (In honor of Z. Collins, Esq., 



of Philadelphia.) Calyx 5-cleft ; corolla bilabiate, orifice closed, upper 



lip bifid, lower trifid, with the middle segment carinately saccate and 



closed over the declinate style and stamens ; capsule ovoid or globous, 



with 2 membranous, bifid valves ; seeds large, concavo-convex. (I) With 



verticillate or opposite Ivs., axillary and terminal inflorescence. 



1 C. verna Nutt. (Fig. 362.) Minutely puberulent; lowest Ivs. ovate or oblong, 



petiolate, middle and upper sessile, ovate-lanceolate, cordate-amplexicaul, dentate, 



floral ones lance-linear, entire ; verticillasters 2 to 6-flowered ; cor. 2 or 3 times 



shorter than the pedicels, twice longer than the calyx. Banks of streams, shaded or 



