>50 



SCROPHULARIACEAE. 



[Vol. III. 



2. Chelone obliqua L. Red Turtle-head. 

 (Fig. 3245.) 



Chelone obliqua L. Syst. Ed. 11, no. 4. 1767. 



Stem slender, ascending, i°-2° liigh, usually 

 branched, the branches spreading or ascending. 

 Leaves oblong, or broadly lanceolate, acuminate at 

 the apex, narrowed at the base, petioled, sharply 

 serrate with somewhat spreading teeth, or laciniatc, 

 2'-6' long, y^'-iYi' wide; petioles 2"-6" long; 

 principal veins about 10 on each side; flowers red 

 or rose- purple, about 1' long; bracts and cal\x-seg- 

 ments ciliolatc and usually puberulent; capsule 

 similar to that of the preceding species. 



In wet tliickets and along streams, Virginia to Illi- 

 nois, south to Florida. July-Sept. 



Chelone Lyoni Pttrsh. Lyon's Turtle- 

 head. (Fig. 3246.) 



Chelone Lyoni Pursh, Fl. .\ra. Sept. 737. 

 Stem slender, erect or nearly 



1814. 



or nearly so, simple or 

 branched, i°-3° high. Leaves ovate, acuminate at 

 the apex, rounded, truncate or subcordatc at the 

 base; 3'-7' long, i'-4' wide, usually slender-petioled, 

 sharply serrate with divergent teeth, the principal 

 veins S-ioon each side; flowers red or rose-purple, 

 about \' long; bracts and calyx-segments ciliolate 

 and puberulent. 



In swamps and wet thickets, mountainsof Virginia (?); 

 North Carolina and Tennessee to Georgia. July-Sept. 



8. PENTSTEMON Solaud. in Ait. Hort. Kew. 3: 511. 1789. 

 Perennial herbs, mostly branched from the base only, with opposite or rarely verticillate 

 leaves, or the upper occasionally alternate, and large, usually showy, blue purple red or white 

 flowers, in terminal thyrses, panicles, or racemes. Calyx 5-parted, the segments imbricated. 

 Corolla irregular, the tube elongated, more or less enlarged above, the limb 2-lipped; upper 

 lip 2-lobcd; lower lip 3-lobed. Stamens 5, included, 4 of them antheriferous and didynam- 

 ous. the 5th sterile, as long as or shorter than the others; anther-sacs divergent orconnivent. 

 Style filiform; stigma capitate. Capsule ovoid, oblong, or globose, septicidally dehiscent. 

 Seeds numerous, angled or even, wingless. [Greek, five stamens.] 

 About 100 species, natives of North .\merica and Mexico. 



■K- More or less pubescent or glandular, at least the calyx and pedicels. 

 Corolla 'A'-i^i' long; leaves entire, serrate, or denticulate. 

 Stem pubescent or puberulent nearly or quite to the base. 

 Thj-rsus open, panicle-like. 



Corolla densely bearded in the throat: stem leaves lanceolate. 

 Corolla scarcely bearded in the throat; stem leaves ovate. 

 Thyrsus narrow, raceme-like or spike-like. 



Corolla-tube abruptlj- enlarged; sterile filament densely woolly. 

 Corolla-tube gradually enlarged; sterile filament slightly bearded. 

 Only the inflorescence, or pedicels, or calyx pubescent. 

 Thyrsus open, p.anicle-likc. 



Stem leaves oblong, ovate, or lanceolate. 



Corolla white, abruptly enlarged, i'-i'4' long. 

 Corolla purplish, gradually enlarged, S"-io" long. 

 Stem leaves linear-lanceolate. 

 Thyrsus narrow, interrupted; calyx viscid. 

 Corolla 2' long, the tube much enlarged above; leaves dentate. 



•X- -vv Completely glabrous throughout, mostly glaucous. 

 Leaves lanceolate, oblong, ovate, obovate, or orbicular. 

 Stem leaves rounded, clasping; flowers 2' long. 

 Stem leaves acute or acuminate; flowers 9"-i5" long. 

 Corolla q"-io" long; stem leaves lanceolate. 

 Corolla I'-i '.i' long: stem leaves mostly oblong. 

 T.eaves linear or litiear-lanceolate; flowers densely thyrsoid. 

 lir.acts lanceolate, small; flowers 6" -8" long. 

 Bracts ovate, acuminate, large; flowers i' long or more. 



P. hirsulus. 

 F. canescens. 



P. cHs/atus. 

 P. albidiis. 



P. Digitalis. 

 P. Penlslemon. 

 P. gracilis. 

 P. tubiflorus. 

 P. Cobaea. 



10. P. grandiflorus. 



11. P. acuminalus. 



12. P.glaber. 



13. P. angustifolius. 



14. P. IJaydeni. 



