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Standard Cyclopedia of Horticulture
Marrubium (ancient name, referring to the bitter qualities). Labiatae. Hoarhound. Horehound. A familiar aromatic herb.
Marrubium comprises perennials branched from the base, mostly silky or woolly, with wrinkled and crenate or cut lvs. and many-fld. axillary whorls of small white or purplish fls.: calyx tubular. 5-10-nerved and with 5 or 10 awl-shaped teeth; corolla 2-lipped, the upper lip erect and notched or entire, the lower spreading and 3-cleft; stamens 4, didynamous, not exserted; ovary deeply 4-lobed (making 4 smooth nutlets), the style 2-lobed.—Species 30-40, in Eu., N. Afr. and extra-trop. Asia.; one widely naturalized in the U. S.
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