LABIATJ. (MINT FAMILY.) 825 
2. M. alba, n.sp. Smooth or hirsute ; leaves wedge-lanceolate or oblong, 
toothed, rounded at the apex narrowed to the sessile base; the lowest oblong, 
tapering into a slender petiole ; the floral ones ovate or orbicular, obtuse ; whorls 
4-flowered; calyx nerveless, with the two larger lobes notched; corolla white, 
the upper lip emarginate.— Low pine barrens, West Florida, near the coast. 
July and Aug. — Stem 1°-1}° high. Leaves 2’ long, or the radical ones 4! — 5! 
long, and, like the calyx and corolla, thick and somewhat fleshy. 
22. PHYSOSTEGIA, Benth. 
Calyx tubular-bell-shaped, inflated in fruit, nearly equally 5-toothed. Corolla 
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 1/ long. (Dracocephalum Virginianum, L.)— Varies through 
several intermediate forms, including Dracocephalum variegatum, Vent., and D. 
obovatum, Ell, 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, Florida to Mississippi, and northward. June- 
Aug. — Stem 2°- 4° high. Racemes simple or compound. 
23. 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, narrowed at the base; the lateral lobes small, at the margins of 
the throat; the lowest lobe large, notched, contracted at the base into a short 
stalk. Stainens 4, ascending under the upper lip: anther-cells at length spread- 
ing. 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 long-petioled; tube of the corolla straight, the 
lateral lobes trancate; anthers hairy. — Cultivated ground and waste places, 
common. May. @— Stems 4'-12 high. Corolla small, purple, often im- 
perfectly developed. 
24. MARRUBIUM, L. Horenovunp. 
Calyx tubular, 5-10-nerved, nearly equally 5-10-toothed; the teeth spiny, 
mostly spreading in fruit. Corolla-tube included in the calyx, 2lipped; the 
Upper lip erect; the lower 3-lobed, with the middle lobe largest. Stamens 4, 
included : anther-cells diverging. Lobes of the style short, obtuse. ` ts 
