LABIATE.. (mIXT FAMILY.) 325 



2. M. alba, n. sp. Smooth or hirsute ; leaves wcclgc-lanccolatc or oblong, 

 tootlucl, roiiiiiU'il ;U the apex narrowed to the sessile base ; tlie 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 emarginatc. — Low pine barrens. West Florida, near the coast. 

 July and Aug. — Stem 1°- li° high. Leaves 2' long, or the radical ones 4'- 5' 

 long, and, like the calyx and corolla, thick, and somewhat fleshy. 



22. PHYSOSTEGIA, Bcnth. 



Calyx tubular-bell-shapcd, inflated in fruit, nearly equally 5-toothcd. Corolla 

 tubular-funnel-shaped, 2-lii)pcd ; the upper lip erect, concave, entire or notched, 

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

 lip : anthers approximate, wiih the cells parallel, ciliate. Nutlets smooth, 

 acut'ly 3-angIed. — Smooth perennial herbs, with erect mostly simple stems, 

 and opposite showy purplish flowers, in terminal spikes or racemes. 



1. P. Virginiana, Bcnth. 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, Vevt., and D. 

 obovatum, Eli, into var. niiNxicuL.vTA, with lanceolate or linear denticulate or 

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

 — Low ground and swamps, Florida to Mississippi, and northward. June- 

 Aug. — Stem 2°- 4° high. Kaccmes simple or compound. 



23. LAMIUM, L. Dead-Nettle. 



Calyx tubular-bell-shapcd. 5-ncrvcd, nearly equally 5-toothed, the teeth subu- 

 late, not s])iny. Corolla slender, dilated at the throat, 2-lipped ; tlie upper lip 

 ovate or oblong, narrowed at tlic base ; the lateral lobes small, at the murgins of 

 the throat ; the lowest lobe large, notched, contracted at the base into a short 

 stalk. Stamens 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 petiolcd, the floral ones sessile, longer than the dense whorls. 



1. L. amplexicaule, L. Leaves orbicular, ineisely crenate-lobcd ; the 

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

 lateral lobes truncate ; anthers hairy. — Cultivated ground and waste places, 

 common. May. ® — Stems 4'- 12' high. Corolla small, purple, often im- 

 perfectly developed. 



24. MARIIITBIITM, L. HoREHotrxD. 



Calyx tubular, 5-10-nerved, nearly equally 5- 10-toothed ; the teeth spiny, 

 mostly spreading in fruit. Corolla-tube included in the calyx, 2-lip]icd ; 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. Nutlets 

 obtuse at the apex. — Chiefly tomentose or woolly perennial herbs, with rugose 

 leaves, and axillary whorls. 



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