Habit: Annual, perennial herb [to shrub], weak, stinging hairs 0 or few to many; monoecious or dioecious.
Stem: branched or not, erect, spreading, or decumbent.
Leaf: opposite, lanceolate to cordate, toothed, prominently 3--5-veined from base; crystals round to elongate.
Inflorescence: head-, raceme-, or panicle-like.
Staminate Flower: sepals 4, +- free, green, sharp-bristly; stamens 4.
Pistillate Flower: sepals 4, +- free, outer 2 < inner 2.
Fruit: lenticular to deltate, enclosed by 2 inner sepals.
Species In Genus: +- 45 species: especially temperate.
Etymology: (Latin: to burn, from stinging hairs)
Jepson eFlora Author: Robert E. Preston & Dennis W. Woodland
Unabridged Reference: Woodland 1982 Syst Bot 7:282--290Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)Key to Urtica
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