Marrubium vulgare L.
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Lamiaceae
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Scientific Name
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Description
Species Description - Taprooted perennial, the stems generally several, 3–10 dm, nearly prostrate to suberect, conspicuously white-woolly; lvs wholly cauline, canescent-woolly or partly subglabrate, not much reduced upward, petiolate, the blade broadly elliptic to rotund-ovate, evidently crenate, 2–5.5 cm; cal stellate and often ± long-hairy, the tube 4–5 mm, the 10 narrow, firm teeth somewhat shorter, eventually widely spreading, their spinulose tips recurved from the first; cor whitish, slightly exserted, with subequal lips; 2n=34, 36. Native of Eurasia, escaped and established in disturbed habitats nearly throughout the U.S. and s. Can. June–Aug.
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Common Names
horehound