133 
LEONURUS 
¢Leonurus cardiaca L., motherwort, p. 1284 
*¢L. marrubiastrum L., biennial motherwort (Castaner and 
Priesendorf, 1989) 
+L. sibiricus L., p. 1284 
LYCOPUS, bugleweed 
Lycopus americanus Muhlenb. ex W. P. C. Barton, American 
pe area si incl. var. Jongii Benner] (Henderson, 
1962), p. 
L. asper E. Greene, monoragirsh rough bugleweed, p. 1303 
L. rubellus Moench, water horehound [S: incl. var. lanceolatus 
Benner, var. arkansanus (Fresen.) Benner] (Henderson, 
1962), p. 13 
*L. uniflorus Michaux, northern bugleweed, one-flowered 
horehound (Henderson, 1962) 
L. virginicus L., bugle weed, Virginia bugleweed, p. 1302 
MARRUBIUM, horehound 
¢Marrubium vulgare L., common horehound, p. 1276 
MELISSA, balm 
¢Melissa officinalis L., lemon balm, bee balm, p. 1296 
var. officinalis 
MENTHA, mint 
Mentha arvensis L., field mint [S: incl. var. arvensis f. arvensis, var. 
arvensis f. glabra (Benth.) Stewart, var. villosa (Benth.) 
Stewart f. glabrata (Benth.) Stewart, var. villosa f. 
villosa; M: incl. var. villosa] (infraspecific variation in 
this species is poorly understood and requires further 
study; see G: and Harley, 1972), p. 1304 
M. x gentilis L., see named hybrids 
S: Steyermark G: Great Plains Flora M: Mohlenbrock 
