LABIATE. (MINT FAMILY.) 389 



thers 2-celled. Nutlets uot 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 1- 2 high. Leaves 2' - 3' long. Co- 

 rolla purple. 



2. S. cordata, Riddell. Stem slender, more or less hirsute; leaves thin, 

 oblong-cordate, crenate, acuminate, loug-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, obtuse, entire or sparingly serrate ; raceme 

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

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

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

 1- 1 high. Leaves 1' - 2' long. 



4. S. Floridana, 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 1' long, the lowest shorter than the 

 petiole. 



31. ISANTHUS, Michx. 



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

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

 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, l-li high. Leaves I'-lJ' long, 3-nerved below the 

 middle. 



32. TRICHOSTEMA, L. BLUE CURLS. 



Calyx short, reversed, oblique, 5-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 Rt 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, Nvtt., a smoother form, 

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



