Selected Plants of Navajo Rangelands
Horehound is a pest. It grows at lower to middle elevations, frequently in the shade of trees in a ring around the trunk but also in sidewalks and waste areas. The wrinkled, grayish leaves and nearly hidden white flowers are easy to recognize. The ten spreading and hooked calyceal teeth act like velcro and are dangerous to pets as they can work themselves deeply into fur.
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