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Urtica
See list of 2 species in this genus-
1a. Stipules 5–15 mm long, erect; staminate and carpellate flowers usually in separate inflorescences; inflorescence exceeding the length of the petioles of the subtending leaves; plants perennial from rhizomes
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1b. Stipules 1–3 mm long, spreading to deflexed; staminate and carpellate flowers usually in the same inflorescence; inflorescence often shorter than the length of the petioles of the subtending leaves; plants annual from a taproot
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Each photo represents one species in this genus.