LABIATE. (MINT FAMILY.) 327 



Swamps, South Carolina, and northward. June - Aug. Stem l - 2 high. 

 Leaves 2' -3' long. Corolla purple. 



2. 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, 

 $ - as long as the smooth violet corolla. Wet pine barrens, in the middle 

 districts of South Carolina, and northward. June - Aug. Stem 1 - 1 high. 

 Leaves l'-2' long. 



* * Annual. 



3. S. Floridana, Shuttl. 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 numerous, distant, 

 6-10-flowered ; calyx pubescent, with lanceolate-subulate rigid teeth; corolla 

 twice as long as the calyx, purple. (S. annua, Walt. ?) Low grounds, Middle 

 and South Florida. July. Stem 10'- 15' high. Leaves 1' long, the lowest 

 shorter than the petiole. 



28. ISANTHUS, Michx. 



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

 Stamens 4, incurved-ascending, exserted : anthers 2-celled. 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. COSruleus, Michx. Dry soil in the upper districts. July -Aug. 

 Stem terete, 1 - 1| high. Leaves 1'- l' long, 3-nerved below the middle. 



29. 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. Stamens 

 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 lanceolate, 

 obtuse, narrowed into a petiole. (T. lineare, Nutt. is a smoother form, with linear 

 leaves.) Dry sandy soil, Florida to Mississippi, and northward. Aug. and 

 Sept. Stem 1 - 2 high. 



30. TETJCRIUM, L. GERMANDER. 



Calyx tubular or bell-shaped, 5-toothed. Corolla 5-lobed ; the 4 upper lobes 

 short, the lowest large, oblong or rounded, concave. Stamens 4, didynamous, 

 the lowest pair longest, exserted between the 2 upper lobes of the corolla : 

 anther-cells confluent. Nutlets rugose. 



