LABIATE. (mint FAMILY.) 389 



thers 2-celled. Nutlets not truncate. — Chiefly hairy or hispid herbs, with 

 few-flowered whorls in terminal racemes. 



1. S. aspera, Michx. Stem erect, with the angles rough with recurved 

 bristly hairs, rarely smoothish ; leaves short-petioled, ovate-oblong or ovate- 

 lanceolate, acute, serrate, rounded at the base, smooth, or sprinkled with 

 hairs above ; the floral ones longer than the calyx ; whorls 6 - 10-flowered, the 

 lower ones distant ; calyx-teeth spine-pointed. — Swamps, South Carolina, and 

 northward. June -August. — Stem lj°-2°high. Leaves 2' - 3' long. Co- 

 rolla purple. 



2. S. COrdata, lliddell. Stem slender, more or less hirsute ; leaves thin, 

 oblong-cordate, crenate, acuminate, long-petioled, the floral ones minute ; 

 calyx teeth broadly subulate. — Banks of streams on the mountains of 

 Georgia and Tennessee. August. 



3. S. hyssopifolia, Michx. Smooth or nearly so ; stem erect, slender ; 

 leaves sessile, lanceolate or linear, obtu.se, entire or sparingly serrate ; raceme 

 short, of few 4 - 6-flowered whorls j calyx smooth, with spiny spreading teeth, 

 a third to half as long as the smooth violet corolla. — Wet pine barrens, in 

 the middle districts of South Carolina, and northward. June - August. — Stem 

 1°- 1|° high. Leaves 1' - 2' long. 



4. S. rioridana, Shuttlw. Smooth or hirsute ; stem slender, erect ; 

 leaves lanceolate or oblong, petioled, or the upper ones sessile, acute or obtuse, 

 serrate, truncate, or the lowest subcordate at the base ; whorls few or numer- 

 ous, distant, 6- 10-flowered ; calyx pubescent, with lanceolate-subulate rigid 

 teeth ; corolla twice as long as the calyx, purple. — Low grounds, Florida. 

 July. — Stem 10'- 15' high. Leaves I' long, the lowest shorter tlian the 

 petiole. 



31. ISANTHUS, Michx. 



Calyx bell-shaped, 10-uerved, 5-cleft. Corolla bell-shaped, equally 5-lobed. 

 Stamens 4, incurved-ascending, exserted : anthers 2celled. Nutlets obovoid, 

 impressed-reticulated, laterally cohering at the base. — An annual pubescent 

 and somewhat viscid branching herb, with lanceolate entire or sparingly 

 toothed acute leaves, and small pale blue flowers on 1 - 3-flowered axillary 

 peduncles. 



1. I. Coeruleus, Michx. — Dry soil in the upper districts. July -Au- 

 gust. — Stem terete, 1°-1^° high. Leaves 1'- 1^' long, 3-nerved below the 

 middle. 



32. TRICHOSTEMA, L. Blue Cdrls. 



Calyx short, reversed, oblique, .^-toothed ; the 3 lower teeth long, connate ; 

 the 2 upper ones very short. Corolla slender, nearly equally 5-cleft. Sta- 

 mens 4, long-exserted^ partly coiled : anther cells diverging. Nutlets pitted, 

 united at the base. — Branching annuals, with entire leaves, and solitary blue 

 flowers on lateral peduncles. 



1. T. dichotomum, L. Pubescent and somewhat viscid, or nearly 

 smooth ; stem much branched, obscurely 4-angled ; leaves oblong or lanceo- 

 late, obtuse, narrowed into a petiole. (T. lineare, Nittt., a smoother form, 

 with linear leaves.) — Dry sandy soil. August - Sept. — Stem 1° - 2° high. 



