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 symetrical & arranged in
dense clusters along the stems at the leaf axils. Some butterflies are
attracted to these flowers.
LEAVES: Nearly ovate leaves are bubbly-textured and the margins are
rounded-toothed (crenulate).
RANGE: A non-native plant that has become very common to abundant in the
understory of sycamore gallery woodlands. 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.
Lamiaceae -- Mint Family
More Information:
- Jepson Manual
- Firefly Forest - Tucson
- USDA Plant Profile
- ITIS Taxonomic Report
- Google Images
- Google Scholar Literature Search