Horehound
Marrubium vulgare
Observed along Camp Creek, Maricopa Co, Arizona, USA. April 2009.
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PERENNIAL HERB: Many erect stems from a perennial root stock. Mostly
unbranched stems reach almost meter tall
under ideal conditions. The stems are coated with matted hairs, thus appearing
whitish.
FLOWER: Small white flowers are bilaterally symmetrical arranged in dense
clusters along the stems at the leaf axils.
LEAVES: Nearly ovate leaves are bubbly-textured and the margins are
rounded-toothed (crenulate).
RANGE: A non-native plant that has become common in semi-shady habitats
along riparian streams in the Sonoran Desert. It is normally considered an
invasive weed and becomes more common in areas grazed by cattle. Native to
Europe and widely spread from cultivation.
FRUIT: Dry capsules with four nutlets.
UNARMED.