stinging nettle, more...
Herbs , perennial, rhizomatous, 5-30 dm. Stems simple or branched, erect or sprawling. Leaf blades elliptic, lanceolate, or narrowly to broadly ovate, 6-20 × 2-13 cm, base rounded to cordate, margins coarsely serrate, sometimes doubly serrate, apex acute or acuminate; cystoliths rounded. Inflorescences paniculate, pedunculate, elongate. Flowers unisexual, staminate and pistillate on same or different plants, staminate ascending, the pistillate lax or recurved. Pistillate flowers: outer tepals linear to narrowly spatulate or lanceolate, 0.8-1.2 mm, inner tepals ovate to broadly ovate, 1.4-1.8 × 1.1-1.3 mm. Achenes ovoid to broadly ovoid, 1-1.3(-1.4) × 0.7-0.9 mm.
Plant: perennial herbs; Dioecious or monoecious, erect or sprawling, rhizomatous, 0.5-3 m tall Leaves: elliptic, lanceolate, narrowly to widely ovate, or cordate, the blades 5.5-20 cm long, 1.5-13 cm wide; margins coarsely or sometimes doubly serrate; apex acute or attenuate; base rounded to cordate; cystoliths punctiform INFLORESCENCE: paniculate, either staminate or pistillate, pedunculate, elongate, the staminate ascending, the pistillate lax or recurved Flowers: PISTILLATE FLOWERS with outer tepals linear to slightly spatulate, or lanceolate, 0.8-1.2 mm long; inner tepals ovate to broadly ovate, 1.4-1.8 mm long, 1.1-1.3 mm wide; STAMINATE FLOWERS with 4 equal tepals, 4 stamens, and a rudimentary, cuplike ovary Fruit: FRUITS ovoid to broadly ovoid, 1-1.3 mm long, 0.7-0.9 mm broad, flattened Misc: Alluvial woods, margins of deciduous woodlands, fencerows, waste places; late spring-summer REFERENCES: Boufford, David E. 1992. Urticaceae. Ariz.-Nev. Acad. Sci. 26(1)2.