LABIATE. (MINT FAMILY.) 387 



tube striped with purple and white, the upper lip entire. Pine barren swamps, 

 Georgia to North Carolina. August -Sept. Stem l-l-Jhigh. Corolla 

 li'long. 



2. M. alba, Chapm. Smooth or hirsute ; leaves wedge-lanceolate or ob- 

 long, toothed, rounded at the apex, narrowed to the sessile base ; the lowest 

 oblong, tapering into a slender petiole ; the floral ones ovate or orbicular, ob- 

 tuse ; calyx nerveless, with the two larger lobes notched ; corolla white, the 

 upper lip emarginate. Low pine barrens, West Florida, near the coast. 

 July -August. Stem 1-1^ high. Leaves 2' long, or the radical ones 

 4' - 5' long, and, like the calyx and corolla, thick and somewhat fleshy. 



24. SYNANDRA, Nutt. 



Calyx inflated, bell-shaped, 4-toothed. Corolla 2-lipped, the upper lip en- 

 tire, the lower broadly 3-lobed, spreading. Stamens 4, ascending under the 

 upper lip, hairy; anthers smooth, the contiguous cells of the upper pair 

 smaller, sterile, and connate. Nutlets large, smooth, angular. 



1. S. grandiflora, Nutt. Biennial; stem simple, hairy (1-1^ high) ; 

 leaves thin, loug-petioled, cordate, creuate-serrate, obtuse, the floral ones 

 narrower, acuminate, sessile; corolla large (1^' long), yellowish white; 

 calyx teeth acute. Shady woods, Tennessee, and northward. June. 



25. PHYSOSTEGIA, Benth. 



Calyx tubular-bell-shaped, inflated in fruit, nearly equally 5-toothed. Co- 

 rolla tubular-funnel-shaped, 2-lipped ; the upper lip erect, concave, entire or 

 notched, the lower spreading, broadly 3-lobed. Stamens 4, ascending under 

 the upper lip : anthers approximate, with the cells parallel, ciliate. Nutlets 

 smooth, acutely 3-angled. Smooth perennial herbs, with erect mostly 

 simple stems, and opposite showy purplish flowers, in terminal spikes or 

 racemes. 



1. P. Virginiana, Benth. Leaves large (6' -9' long), oblong, sharply 

 serrate, the lowest narrowed into a petiole ; spikes thick, dense-flowered ; 

 calyx teeth acute; corolla I' long. Varies through several intermediate 

 forms into var. DENTICULATA, with lanceolate or linear denticulate or entire 

 leaves, and smaller (6" -9" long) flowers, in a long loosely flowered spike. 

 Low ground and swamps. June -August. Stem 2 -4 high. Racemes 

 simple or compound. 



26. LAMIUM, L. DEAD NETTLE. 



Calyx tubular-bell-shaped, 5-nerved, nearly equally 5-toothed, the teeth subu- 

 late, not spiny. Corolla slender, dilated at the throat, 2-lipped ; the upper lip 

 ovate or oblong ; the lateral lobes small, at the margins of the throat ; the 

 lowest large, notched, short-stalked. Stamens 4, ascending under the upper 

 lip. Nutlets 3-angled, truncate at the apex. Herbs. Leaves incised ; the 

 lower ones petioled, the floral ones sessile, longer than the dense whorls. 



1. L. amplexicaule, L. Leaves orbicular, incisely crenate-lobed ; the 

 floral ones clasping, the others petioled ; tube of the corolla straight, the 



