Family: Lamiaceae
Canada horse-balm, northern horse-balm, richweed, stoneroot
Kitty Kohout
Wisconsin Dept. of Natural Resources
Etymology: Collinsonia: for Peter Collinson, early English botanist
Plants: erect, perennial, 20"-40" tall, aromatic forb; stems square, branched above; from thick, woody rhizomes
Leaves: opposite, toothed, smooth, oblong, several pairs scattered on the stem
Flowers: yellow to white, 5-parted, 1/2" long, irregularly tube-shaped, lower lip fringed, 2 stamens;
; inflorescence branched spikes of paired flowers; blooms July-Sept.
Fruits: 1-seeded nutlet
Habitat: woods; in rich soil
Conservation Status: Endangered
Plants: erect, perennial, 20"-40" tall, aromatic forb; stems square, branched above; from thick, woody rhizomes
Leaves: opposite, toothed, smooth, oblong, several pairs scattered on the stem
Flowers: yellow to white, 5-parted, 1/2" long, irregularly tube-shaped, lower lip fringed, 2 stamens;
; inflorescence branched spikes of paired flowers; blooms July-Sept.Fruits: 1-seeded nutlet
Habitat: woods; in rich soil
Conservation Status: Endangered
Floristic Rating: Coefficient of Conservatism = 10, Wetland Indicator = FAC USDA Plants Database: Federal Distribution and detailed information including photos David G. Smith's "Delaware Wilflowers": Beautiful photographs; descriptions Southwest School of Botanical Medicine: Britton & Brown Illustrated Flora - 2nd Edition (1913) "An Illustrated Flora of the Northern United States and Canada"
Wisconsin Dept. of Natural Resources
Emmet J. Judziewicz
Marion Sheehan
Botanical Illustration
Marion Sheehan
