Boehmeria cylindrica (L.) Sw.
Boehmeria austrina Small
Boehmeria cylindrica (L.) Sw. var. drummondiana (Weddell) Weddell
Boehmeria cylindrica (L.) Sw. var. scabra Porter
Boehmeria decurrens Small
Boehmeria drummondiana Weddell
Boehmeria scabra (Porter) Small
Urtica cylindrica L.
False nettle is a native North American species. The name comes from is resemblance to stinging nettle, although it is not related, and lacks the stinging hairs of its namesake.
Identification: Plants are 4-63" (10-160 cm) high, and favor shady wooded areas. Stems are smooth, without the irritating hairs of stinging nettle. Leaves are usually opposite or nearly so. They are roughly egg-shaped, with sharp tips and teeth. (More precisely, they are elliptic, lanceolate to broadly ovate.) The leaves are 1¾-7" (5-18 cm) × ¾-4" (2-10 cm). The unusual flowers are the most unique feature of this species. They occur on straight spikes that emerge from the stem, in clusters of small, inconspicuous green flowers. Each spike is often tipped by a couple of small leaves. Blooms July-August. The flowers are dioecious—each plant contains only male or female flowers. Fruits are spiky little balls.
Boehmeria cylindrica on Missouriplants.com
Boehmeria cylindrica at the Lady Bird Johnson Wildflower Center
Boehmeria cylindrica on the USDA Plants Database
Boehmeria cylindrica on Plants for a Future, a resource and information centre for edible and otherwise useful plants
Boehmeria cylindrica on eFloras
Boehmeria cylindrica description by Thomas H. Kent, last updated 15 Oct 2013.