LABI AT JE. 277 



6. Pycnanthemum. Calyx more or less tubular, about 13-nerved, 

 5-toothed. Corolla bilabiate, with a short tube ; upper lio nearly flat ; 

 lower lip with 3 ovate, obtuse lobes. Stamens distant. Anther-cells 

 parallel, y. 



1. P. INCANUM {Mountain Mint}. Stem erect, obtusely 4-angled, white- 

 downy, leaves oblong-ovate, remotely toothed, acute, hoary beneath ; up- 

 permost whitish on both sides ; flowers in dense 'whorls, forming loose, com- 

 pound cymes or heads ; corolla flesh-colored or pale purple ; the lower lip 

 spotted with dark purple ; calyx bilabiate, the 3 upper segments being united 

 and bearded at the extremity. In rocky woods, 2-3 feet high. July. 



2. P. LANCEOLATUM (Narrow-leaved Wild Basil}. Smooth or slightly 

 downy ; stem erect, pubescent on the angles, very branching, leafy ; leaves 

 lanceolate ; flowers in dense heads, forming a terminal corymb ; bracts ovate- 

 lanceolate, acuminate, white-downy ; calyx-teeth short, triangular, white- 

 downy ; corolla pale purplish white, spotted with brownish purple. Thickets 

 and fields, 1-3 feet high. July-August. 



7. Thymus. Calyx bilabiate, about 13-nerved, hairy in the throat ; 

 upper lip 3-toothed ; lower lip 2-cleft. Corolla short, somewhat 

 2-lipped ; upper lip flattish, lower lip spreading, with 3 nearly equal 

 teeth. Stamens 4, distant. 



1. T. VULGARIS (Thyme]. Stems decumbent at base, ascending, branch- 

 ing, tufted ; leaves oblong-ovate, or lanceolate, entire, veiny, revolute on the 

 margins ; flowers in whorls, arranged so as to form terminal, leafy spikes ; 

 corolla purplish. June-August. 



2. T. SERPYLLUM (Creeping Thyme). Stems decumbent at base, ascend- 

 ing, wiry, branching, slender, leafy, downy above, tufted ; leaves ovate, obtuse, 

 entire ; flowers in dense, oblong heads ; corolla purple, spotted. June- July. 



8. Hyssopus. Corolla bilabiate ; upper lip erect, flat, emargi- 

 nate ; lower lip 3-parted ; tube about as long as the calyx, y. 



H. OFFICINALIS (Hyssop}. Stems erect, tufted ; leaves linear-lanceolate, 

 acute, entire, sessile ; flowers in racemose, one-sided verticils, bright blue ; 

 calyx-teeth erect. In gardens, 2 feet high. July. 



9. Collinsonia. Calyx bilabiate ; upper lip truncate, 3-toothed ; 

 lower lip 2-toothed. Corolla somewhat bilabiate ; upper lip with 4 

 nearly equal lobes ; lower lip longer, fringed. Stamens 2, rarely want- 

 ing, much exserted, diverging, y. 



C. CANADENSIS (Horse-Balm). Stem erect, square, branching; leaves 

 ovate, coarsely serrate ; flowers rather large, in racemes, forming a terminal 

 panicle ; corolla pale yellow, with a conspicuously fringed lower lip ; calyx- 

 teeth subulate ; style and stamens very long. In damp, rich soils, 3-5 feet 

 high. July-September. 



10. Hedeoma. Calyx nearly tubular, 13-ribbed, bilabiate ; upper 

 lip 3-toothed ; lower lip 2-toothed ; throat hairy. Corolla bilabiate ; up- 



