The Ohio State University: College of Food, Agricultural, and Environmental Sciences

Purple Deadnettle

Purple Deadnettle, Lamium purpureum


Family: Lamiaceae; Mint Family

Vegetative Characteristics: 

Seedling: Cotyledons oval, glabrous; leaves opposite, pubescent, orbicular

Stems: erect or decumbent at base, 10.0-45.0 cm tall, branched from base and sometimes from axils, square, often purple-streaked, hollow; pilose, pubescent, or glabrous

Leaves: opposite, 8.0-12.0 mm long, orbicular to ovate, 3-lobed or not lobed, deep green to purplish, pubescence sparse or glabrous, margins scalloped and bristly, with petiole

Reproductive Characteristics: 

Inflorescences: cyme, 3-6 in whorl, corolla purple-red, 1.0-2.0 cm long, upper lip densely reddish pubescent; calyx 5.0-8.0 mm long, purple-angled, pubescent; bracts foliaceous, sessile, clasping sometimes 3-lobed

Fruits: mericarp, 2.0 mm long

Seeds: oboval, 1.8 mm long, light brown, usually with white spots

Special Identifying Features: 

erect or decumbent winter annual; stems square; flowers reddish purple; leaves orbicular with petioles, margins bristly and scalloped