SCROPXULARIACEAE. 823 



lobes ovate; corolla contracted at the throat, green to purple and shining without, 

 dull within, the two lateral lobes erect; lobes of the upper lip often narrowly 

 oblong; capsule ovoid-conic. In woods and along roadsides, Vt. to Conn., Minn., 

 Va. and Kans. May -July. 



7. CHELONE L. 



Perennial, mostly glabrous herbs, with opposite serrate petioled leaves, and 

 large white red or purple flowers, in terminal and axillary dense spikes. Calyx 5- 

 parted, bracted at the base, the segments ovate or lanceolate. Corolla irregular, 

 the tube elongated, enlarged above, the limb 2-lipped; upper lip concave, emargin- 

 ate or entire, exterior in the bud; lower lip spreading, woolly within, 3-lobed. 

 Stamens 5, included, 4 of them antheriferous, didynamous, the fifth sterile, 

 smaller; filaments slender, woolly; anthers woolly, cordate. Style filiform ; stigma 

 small, capitate. Capsule ovoid, speticidally dehiscent. Seeds numerous, com- 

 pressed, winged. [Greek, tortoise, the head of which the corolla resembles.] 

 Three species, of eastern N. Am. 



Corolla white ; bracts not ciliolate. I. C. glabra* 

 Corolla red or rose-purple ; bracts ciliolate. 



Leaves oblong or lanceolate. 2. C. obliqua. 



Leaves ovate, acuminate ; mountain plant. 3. C. Lyoni. 



1. Chelpne glabra L. SNAKE-HEAD. TURTLE-HEAD. (I. F. f. 3244.) Stem 

 obtusely 4-sided, simple or sometimes branched, 3-9 dm. high. Leaves lanceolate, 

 sharply serrate with low appressed teeth, acuminate at the apex, narrowed at the 

 base, short-petioled, 7-15 cm. long, the principal veins about 10 on each side of 

 the midvein; flowers white or faintly pink, about 2.5 cm. long; calyx- segments 

 ovate-oblong, obtuse; capsule obtuse, about 12 mm. high, twice as long as the 

 calyx. In swamps and along streams, Newf. to Fla., Manitoba and Kans. Lower 

 leaves sometimes broadly oval. July-Sept. 



2. Chelone obliqua L. RED TURTLE-HEAD. (I. F. f. 3245.) Stem slender, 

 ascending, 3-6 dm. high, the branches mostly spreading or ascending. Leaves 

 oblong, or broadly lanceolate, acuminate at the apex, narrowed at the base, peti- 

 oled, sharply serrate with somewhat spreading teeth, or laciniate, 5-15 cm. long; 

 petioles 4-12 mm. long; principal veins about 10 on each side; flowers red or rose- 

 purple, about 2.5 cm. long; bracts and calyx-segments ciliolate and usually puber- 

 ulent; capsule similar to that of the preceding. In wet thickets and along streams, 

 Va. to 111. and Fla. July-Sept. 



3. Chelone Lyoni Pursh. LYON'S TURTLE-HEAD. (I. F. f. 3246.) Stem 

 erect or nearly so, 3-9 dm. high. Leaves ovate, acuminate at the apex, rounded, 

 truncate or subcordate at the base, 7-18 cm. long, usually slender-petioled, sharply 

 serrate with divergent teeth, the principal veins 8-10 on each side; flowers red or 

 rose-purple, about 2.5 cm. long; bracts and calyx-segments ciliolate and puberu- 

 lent. In swamps and wet thickets, mountains of Va. (?); N. Car. and Tenn. to 

 Ga. July-Sept. 



8. PENTSTEMON Soland. 



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

 verticillate leaves, or the upper occasionally alternate, and large, 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-lobed; lower lip 3-lobed. Stamens 5, in- 

 cluded, 4 of them antheriferous and didynamous, the 5th sterile, as long as or 

 shorter than the others; anther-sacs divergent or connivent. Sty le filiform ; stigma 

 capitate. Capsule ovoid, oblong, or globose, septicidally dehiscent. Seeds numer- 

 ous, wingless. [Greek, five stamens.] About 100 species, of N. Am. and Mex. 



* More or less pubescent or glandular, at least the calyx and pedicels. 

 Corolla 2-3 cm. long; leaves entire, serrate, or denticulate. 

 Stem pubescent orpuberulent nearly or quite to the base. 

 Thyrsus open, panicle-like. 



Corolla densely bearded in the throat ; pubescence villous. 



1. P. hirsutus. 

 Corolla scarcely bearded in the throat; pubescence canescent. 



2. P. canescens. 



