Collinsonia tuberosa Michx.

Deepwoods Horsebalm; Stoneroot

Herb

Perennial

Vascular

Deepwoods Horsebalm is a native herbaceous perennial in the Mint family (Lamiaceae). It can be found throughout most of Alabama in areas with neutral to basic soils. Deepwoods Horsebalm occurs in mesic hardwood forests, in prairie woodlands, in ravines, and on slopes along rivers and streams. It is a perennial from a thickened, knotty, globose rhizome. Usually 1 stem is produced from the apex of each rhizome. The stems are erect, unbranched or branched above the middle, 4-sided, and green or purplish in color. Leaves are opposite, petiolate, elliptic to ovate in outline, with 5-15 teeth along each margin. The petioles are ½ or more as long as the blades. The leaves have a minty odor when crushed and are glabrous or pubescent along the margin and main veins below. Flowers are produced in a terminal panicle or raceme. There are 2 flowers per node. The calyx is glandular pubescent with 5 lanceolate teeth, the lower two longer than the upper. The corolla is zygomorphic, white streaked with purple in color, with 2 long exserted stamens. The lower lip of the corolla is much longer than the upper and deeply fringed. The flowers have a lemon odor. The fruit is a nutlet.—A. Diamond

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Native

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