LABIATE. (MINT FAMILY.) 373 



TRIBE V. STACHYDE.E. Stamens 4 ; the lower pair longer, parallel, ascending. 

 Upper lip of the corolla concave or keeled. Calyx 3 - 10-toothed or lobed. Nutlets 



smooth, distinct. 



* Calyx 2-lipped, closed m fruit. 



21. BRUNELLA. Lips of the calyx toothed. Flowers 3 in a cluster, spiked. 



22. SCUTELLARIA. Lips of the calyx entire ; the upper one appendaged. Flowers single, 



opposite. 



* * Calyx not 2-lipped ; the teeth or lobes spineless. 



23. MACBRIDEA. Calyx 3-lobed. Flowers capitate, in crowded 4-flowered whorls. 



24. SYNANDRA. Calyx 4-toothed. Sterile anther cells connate. 



25. PHYSOSTEGIA. Calyx 5-toothed. Flowers opposite, spiked. Nutlets 3-angled. 

 20. LAMIUM. Calyx 5-toothed. Flowers in axillary cymes. Nutlets truncated. 



* * * Calyx not 2-lipped ; the teeth rigid or spiny. 



27. MARRUBIUM. Calyx teeth 10, nearly equal. Stamens included. Herbs woolly. 



28. LEONOTIS. Calyx teeth 8 - 10, very unequal. Stamens exserted. Whorls globose. 



29. LEONURUS. Calyx teeth 5. Nutlets obtuse, not truncate. Leaves iucisely lobed. 



30. STACHYS. Calyx teeth 5. Nutlets truncate, sharp-angled. Leaves undivided. 

 TRIBE VI. AJUGE^E. Stamens 4, ascending, parallel, exserted. Nutlets reticulated 



and pitted, their bases partially united within. 



* Stamens barely exserted, nearly equal. 



31. ISANTHUS. Lobes of the corolla and calyx nearly equal. Peduncles 1 - 3-flowered. 



* * Stamens long-exserted, didynamous. 



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



33. 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. micranthum, Willd. Stem branched, pubescent ; leaves ovate 

 and ovate-lanceolate, finely serrate, slender-petioled ; 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 up- 

 per 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. Perennial; stem mostly simple, pubescent above; 

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

 itate, surrounded by an involucre of several lanceolate whitish bracts ; corolla 

 small, white, dotted with purple. Low ground, Florida to North Carolina, 

 and westward July - Sept. Stem 2 - 4 high. 



