Boehmeria japonica is a perennial nettle relative native to East Asia. Its broad, rough leaves grow in opposite pairs and have uneven teeth along the edges, and its tiny green flowers form slender clusters. Boehmeria japonica resembles false nettle (Boehmeria cylindrica), and a single leaf photo may not reliably tell them apart.
Both have opposite, toothed leaves and small green flowers. The teeth on this East Asian plant are often coarse and uneven, but a single leaf photo may not separate the two reliably.