Sub-category: Mint family
Resembles stinging nettles, however it lacks the stinging hairs. Leaves and stems are often a dark purple. Stems are up to 1m tall, erect, purple and 4-angled, with a single median vertical groove on each side of the stem. Leaves are opposite, petiolate, decussate. Petioles to 5cm long, purple, with a very shallow adaxial groove. Blades ovate, serrate, acute, to 10cm long, 8cm broad, sometimes crisped or not, typically green above and purple-green or entirely purple below, mostly glabrous above, pubescent on the veins below, with any punctate glands below (use a lens to see). Lateral veins prominent and expressed below.
Can be found near rich soils, alluvial soils or dry soils along streams, spring branches, gravel bars, roadsides, and railroads.