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Vascular Plants of California
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Croton setiger

Higher Taxonomy
Family: EuphorbiaceaeView DescriptionDichotomous Key
Habit: 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.
Genera In Family: 217 genera, 6000+ species: +- worldwide especially tropics; some cultivated (Aleurites, tung oil; Euphorbia species; Hevea, rubber; Ricinus). Toxicity: Many species +- highly TOXIC, due primarily to latex, especially if eaten or in contact with skin, eyes. Note: Eremocarpus moved to Croton, Tetracoccus moved to Picrodendraceae for TJM2; Chamaesyce moved to Euphorbia here (key to genera revised by Thomas J. Rosatti).
eFlora Treatment Author: Mark H. Mayfield & Grady L. Webster, except as noted
Scientific Editor: Bruce G. Baldwin.
Genus: CrotonView DescriptionDichotomous Key

Habit: Annual to shrub [tree]; sap clear or colored; monoecious or dioecious. Stem: spreading to erect. Leaf: cauline, alternate, entire in California; hairs generally stellate. Inflorescence: cyme, spike, or raceme, generally terminal. Staminate Flower: generally pedicelled; sepals generally 5; petals 5 or 0; stamens 8--50(300), filaments free, bent inward in bud; nectar disk generally divided. Pistillate Flower: pedicel short or 0, becoming longer in fruit; sepals generally 5, entire to lobed; petals generally 0; nectar disk entire; ovary 1--3-chambered, styles 2-lobed, +- dissected, or simple. Fruit: spheric or 3-lobed, smooth or tubercled. Seed: smooth to ribbed or pitted; scar appendaged.
Species In Genus: 1200--1300 species: tropics, warm temperate, worldwide. Etymology: (Greek: tick, for resemblance of seed)
eFlora Treatment Author: Mark H. Mayfield & Grady L. Webster
Reference: Berry et al. 2005 Amer J Bot 92:1520--1534
Croton setiger Hook.
Habit: Annual < 2 dm, < 8 dm wide, mound-like; monoecious. Stem: spreading to ascending. Leaf: petiole 1--5 cm; blade 1--6 cm, ovate, tip rounded. Staminate Inflorescence: cyme, terminal. Pistillate Inflorescence: cyme, axillary, proximal to staminate inflorescence; flowers 1--3. Staminate Flower: pedicel 2--3 mm; receptacle finely bristly; sepals 5--6; petals 0; stamens 6--10. Pistillate Flower: pedicel +- 0; sepals 0; glands below ovary 4--5; ovary 1-chambered, style 1, simple. Fruit: +- 4 mm diam. Seed: 1, 3--4 mm, smooth or +- ridged; scar not appendaged. Chromosomes: 2n=20.
Ecology: Dry, open, often disturbed areas; Elevation: < 1000 m. Bioregional Distribution: CA-FP, w D; Distribution Outside California: to Washington. Toxicity: Herbage TOXIC to livestock, especially in hay. Flowering Time: May--Oct
Synonyms: Eremocarpus setiger (Hook.) Benth.; Croton setigerus, orth. var.
Jepson eFlora Author: Mark H. Mayfield & Grady L. Webster
Reference: Berry et al. 2005 Amer J Bot 92:1520--1534
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Citation for this treatment: Mark H. Mayfield & Grady L. Webster 2012, Croton setiger, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on April 24, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora,, accessed on April 24, 2019.

Croton setiger
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© 2006 Keir Morse
Croton setiger
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© 2009 Keir Morse
Croton setiger
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© 2005 George W. Hartwell
Croton setiger
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© 2004 Carol W. Witham
Croton setiger
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© 2008 Keir Morse
Croton setiger
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© 2011 Steve Matson

More photos of Croton setiger in CalPhotos

Geographic subdivisions for Croton setiger:
CA-FP, w D;
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time.