Urticaceae

• See list of 2 genera in 1a
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  1a. Leaves alternate
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    Laportea

    2a. Plants with conspicuous, stinging hairs; leaf blades serrate; carpellate sepals distinct or nearly so, only 2 of the 4 sepals persistent in fruit, not enclosing the achene in fruit; staminate flowers each with 5 sepals and stamens
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    Parietaria

    2b. Plants without stinging hairs (or sometimes with a few minute stinging hairs); leaf blades entire; carpellate sepals connate at the base, 4-lobed, accrescent, enclosing the achene in fruit; staminate flowers each with 4 sepals and stamens
• See list of 3 genera in 1b
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  1b. Leaves opposite
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    Urtica

    3a. Plants with conspicuous stinging hairs; carpellate calyx of 4 distinct sepals
  • See list of 2 genera in 3b
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    3b. Plants without stinging hairs (or sometimes with a few minute stinging hairs); carpellate calyx of 3 sepals or 4 connate sepals
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      Boehmeria

      4a. Inflorescence a spike [Fig. 922]; carpellate sepals connate at the base, 4-lobed, accrescent, enclosing the achene in fruit; leaf blades with rounded cystoliths
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      Pilea

      4b. Inflorescence a panicle; carpellate sepals distinct or nearly so, 3-lobed, not enclosing the achene in fruit; leaf blades with linear cystoliths

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 Show photos of:   Each photo represents one genus in this family.