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Key to families | Table of families and genera
Indexes to all accepted names and synonyms:
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Annual to shrub, tree [vine, cactus-like succulent]; monoecious or dioecious; sap clear or milky. Stem: generally branched [fleshy or spiny]. Leaf: generally simple, alternate to whorled, generally stipuled, sessile or petioled; blade entire, toothed, or lobed. Inflorescence: flowers solitary or in terminal or axillary cymes, racemes, spikes, or panicles, or (in Euphorbia) 1° inflorescence a compact, flower-like cyathium with much-reduced flowers enclosed within an involucre of fused bracts, cyathia terminal or axillary, 1 or in cyme-like arrays. Flower: unisexual, ± radial; sepals 0 or 2–6, free or fused; petals generally 0(5); stamens 1–many, free or filaments fused; ovary superior, chambers (1)3(4), styles free or fused, undivided, forked, or variously lobed. Fruit: generally capsule that splits into mericarps that then dehisce, releasing seeds. Seed: 1 per chamber; knob-like appendage sometimes present at attachment scar.
217 genera, 6000+ species: ± worldwide especially tropics; some cultivated (Aleurites, tung oil; Euphorbia species; Hevea, rubber; Ricinus). Many species ± highly TOXIC, due primarily to latex, especially if eaten or in contact with skin, eyes. [Yang et al. 2012 Taxon 61:764–789] Eremocarpus moved to Croton, Tetracoccus moved to Picrodendraceae for TJM2; Chamaesyce moved to Euphorbia here (key to genera revised by Thomas J. Rosatti). —Scientific Editor: Bruce G. Baldwin.
Key to Euphorbiaceae
Tree [shrub]; sap milky; monoecious. Stem: branches slender, glabrous. Leaf: cauline, alternate; petiole tip with adaxial pair of large, ± spheroid glands; blade entire, adaxially glabrous, abaxially papillate-glaucous, with 0–few glands near margins. Inflorescence: spike-like panicles or racemes, terminal or axillary, elongate, yellow-green; bracts 1–2 mm, with pair of large glands; pedicels 2–3 mm in ours; pistillate flowers basal, 1/bract; staminate flowers distal or throughout, generally 5–8/bract. Staminate flower: sepals 3, fused; stamens 2 or 3, filaments generally < 1 mm; nectary disk 0. Pistillate flower: sepals 3, fused; nectary disk 0; ovary 3-chambered, styles 3, fused proximally, simple. Fruit: ± spheric or ± 3-lobed, smooth. Seed: ± white, often staying attached to persistent fruit axis.
3 species: native to eastern & southeastern Asia. (Greek: 3, for lobes of calyx, ovary, fruit) [Bower et al. 2009 Inv Plant Sci Managem 2:386–395; Esser 2002 Harvard Pap Bot 7:17–21]
Previous taxon: Tragia ramosa
Next taxon: Triadica sebifera
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Jul 28 2014
Citation for this treatment: [Author of taxon treatment] 2013. Triadica, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=69369, accessed on Jul 28 2014
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