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Key to families | Table of families and genera

Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.

 

URTICACEAE NETTLE FAMILY

Robert E. Preston & Dennis W. Woodland


Annual, perennial herb [to shrub, soft-wooded tree], hairs stinging and not [glabrous]; monoecious or dioecious; wind-pollinated. Leaf: alternate or opposite, generally stipuled, petioled, blade often with translucent, raised dots due to crystals in epidermal cells. Inflorescence: axillary, 1-flowered or head-, raceme-, or panicle-like. Flower: generally unisexual, small, ± green; sepals generally 4–5, free to fused; petals 0. Staminate flower: stamens generally 4–5, opposite sepals, incurved in bud, reflexing suddenly when flower opens. Pistillate flower: ovary 1, superior, chamber 1, style 0–1, stigma 1, generally hair-tufted. Fruit: generally achene.
50 genera, 700 species: worldwide; some cultivated (Boehmeria, ramie; Pilea, clearweed). [Boufford 1997 FNANM 3:400–413] —Scientific Editor: Thomas J. Rosatti.
Unabridged references: [Miller 1971 J Arnold Arbor 52:40–68]

Key to Urticaceae

1. Stinging hairs present; leaves opposite

2. Pistillate sepals 2–4, fused ± to tip, ± equal ..... HESPEROCNIDE

2' Pistillate sepals 4, ± free, outer 2 < inner 2 ..... URTICA

1' Stinging hairs 0; leaves alternate or opposite

3. Leaves opposite (alternate), toothed; inflorescence spike-like ..... BOEHMERIA

3' Leaves alternate, entire; inflorescence 1-flowered or head-, spike-, or panicle-like

4. Stems decumbent to erect; leaf 10–90 mm; inflorescence head-, spike-, or panicle-like, generally few-flowered ..... PARIETARIA

4' Stems prostrate; leaf 3–8 mm; inflorescence 1-flowered ..... SOLEIROLIA

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Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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