312 LABIATJE. (MINT FAMILY.) 



* * Stamens long-exserted, didynamous. 



29. TRICHOSTEMA. Lobes of the corolla nearly equal. Calyx 5-cleft. Flowers solitary. 



30. TEUCRIUM. Lower lobe of the corolla longest. Calyx 5-toothed. Whorls crowded. 



1. OCIMUM, L. BASIL. 



Calyx ovate or bell-shaped, 5-toothed, angled, deflexed in fruit; the upper 

 tooth roundish, with the margins decurrent. Corolla nearly equally 2-lipped ; 

 the upper lip 4-cleft ; the lower entire, flat. Stamens 4, didynamous ; the lower 

 pair longer, resting upon the lower lip of the corolla. Style 2-cleft at the apex. 

 Glands of the disk 1-4. Nutlets smooth, ovoid or globular. Chiefly tropical 

 herbs or shrubs. Whorls 6-flowered, in a terminal bracted spike or raceme. 



1. O. Campechianum, Miller. Stem branched, pubescent, especially at 

 the joints ; leaves ovate and ovate-lanceolate, acute, finely serrate, narrowed into 

 a slender pubescent petiole, paler and pubescent on the veins beneath, dotted ; 

 raceme many-flowered, pubescent ; bracts ovate ; calyx hispid on the nerves, the 

 lower teeth awned ; corolla small, slightly exserted ; stamens smooth. South 

 Florida. Stem 6' - 12' high. Leaves 1'- 2' long. Flowers purple. 



2. HYPTIS, Jacq. 



Calyx tubular, with 5 equal subulate teeth. Corolla 5-lobed ; the four upper 

 lobes short, spreading or reflexed ; the lowest longer, saccate, abruptly deflexed, 

 thickened at the base. Stamens 4, didynamous, included in the bud in the 

 lower lobe of the corolla. Nutlets smooth, ovoid. 



1. H. radiata, Willd. Herbaceous; stem erect, mostly simple, pubescent 

 above ; leaves ovate-lanceolate, serrate or toothed, tapering into a petiole, 

 smooth ; heads peduncled, in the axils of the upper leaves, globose, surrounded 

 by an involucre of several lanceolate whitish bracts, pubescent ; corolla small, 

 white, dotted with purple. Low ground, Florida to North Carolina, and west- 

 ward. July - Sept. Stem 2 - 4 high. 



3. MENTHA, L. MINT. 



Calyx tubular, nearly equally 5-toothcd. Corolla equally 4-lobed, the upper 

 lobe notched or entire. Stamens 4, equal, distant, straight : anther-cells parallel. 

 Style 2-cleft at the apex. Nutlets smooth, obtuse. Pungent aromatic herbs. 

 Whorls (in our species) approximate, forming a dense or interrupted terminal 

 spike. 



1. M. viridis, L. Stem and leaves smooth; leaves ovate-lanceolate, un- 

 equally serrate, nearly sessile ; bracts leafy, and, like the calyx, smooth or hairy ; 

 spike cylindrical, interrupted below ; calyx-teeth linear-subulate. (M. tenuis, 

 Michx.) Damp soils. Introduced, and sparingly naturalized. July - Sept. 

 Stem 1 - 2 high. Flowers pale blue. 



2. M. rotundifolia, L. Soft-hairy; stem erect; leaves roundish, rugose, 

 crenate, sessile, hoary beneath ; spikes oblong, interrupted ; bracts lanceolate ; 



