322 LABIATE. (MINT FAMILY.) 



2. N. Glechoma, Benth. Stem prostrate or creeping, pubescent ; leaves 

 round-cordate, obtuse, serrate, petioled ; whorls in nearly all the axils, few- 

 flowered ; corolla blue. Low shady places, near dwellings. Introduced. 

 Stem 4'- 12' long. Leaves ' - 1' long. Anthers forming a cross. 



18. CEDRONELLA, Moench. 



Calyx bell-shaped, nearly equally 5-toothed ; the mouth oblique. Corolla 

 dilated at the throat, 2-lipped j the upper lip straight, 2-cleft, the lower 3-cleft, 

 with the middle lobe largest. Stamens 4, ascending, the upper pair longest : 

 anther-cells parallel. Nutlets smooth. Flowers in a terminal spike or raceme. 



1. C. cordata, Benth. Stem low, pubescent, bearing long runners ; leaves 

 long-petioled, cordate, crenate, smoothish; the floral ones ovate; raceme few- 

 flowered, 1-sided; cymes 1 - 3-flowered ; calyx and pale-blue corolla large. 

 (Dracocephalum cordatum, Nutt.) Shady banks, on the mountains of North 

 Carolina. May and June. Stem ^ high, creeping at the base. Leaves 1' 

 long. Corolla 1 1' long. Plant pleasant-scented. 



19. BRTJNELLA, Tourn. SELF-HEAL. 



Calyfc tubular-bell-shaped, 10-nerved, flat above, 2-lipped; upper lip broad, 

 truncated, 3-toothed, the lower 2-cleft. Corolla-tube slightly inflated under the 

 throat, 2-lipped; the upper lip roundish, arching, entire, the lower 3-lobed, 

 with the middle lobe rounded, concave, crenate. Stamens 4, exserted, the 

 smooth filament prolonged above the anther : anther-cells spreading. Herbs, 

 with 6-flowered; densely-spiked whorls. Floral leaves orbicular, imbricated, 

 persistent. 



1. B. Vlllgaris, L. Pubescent or smoothish ; stem erect, mostly simple ; 

 leaves ovate or oblong, serrate, petioled ; spikes oblong or cylindrical ; flowers 

 purple. Low grounds, Florida, and northward. Introduced. Stem 6' -12' 

 high. Spikes thick, lateral and terminal. 



20. SCUTELLABIA, L. SKULLCAP. 



Calyx bell-shaped, 2-lipped, entire and closed after flowering ; the upper lip 

 furnished with a helmet-shaped appendage on the back, and falling away at 

 maturity, the lower persistent. Corolla-tube recurved-ascending, dilated at the 

 throat, 2-lipped ; the upper lip arching, entire or notched, with the small lateral 

 lobes united with its sides, the lowest lobe large and spreading. Stamens 4, 

 ascending : anthers dilate 1 , approximate by pairs, those on the shorter filaments 

 1-celled, on the longer ones 2-celled, cordate. Perennial mostly inodorous 

 herbs. Flowers opposite, solitary, in the axils of the upper, mostly bract-like 

 leaves, rarely in lateral racemes. Corolla blue or white. 



* Flowers in terminal racemes. 



*- Leaves cordate, ovate or oblong, crenate, petioled ; the floral ones shorter than the 



flowers, entire. 



1. S. versicolor, Nutt. Softly pubescent; stem stout, branched above; 

 leaves large, long-petioled, all broadly cordate, rugose and reticulate ; the floral 



