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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)

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.
eFlora Treatment Author: Mark H. Mayfield & Grady L. Webster
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Citation for this treatment: Mark H. Mayfield & Grady L. Webster 2016. Croton setiger, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on April 28, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on April 28, 2016.

Croton setiger
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© 2004 George W. Hartwell
Croton setigerus
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© 2002 Gary A. Monroe
Croton setiger
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© 2004 Carol W. Witham
Croton setiger
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© 2014 Neal Kramer
Croton setiger
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© 2015 Keir Morse
Croton setiger
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© 2006 Keir Morse

More photos of Croton setiger in CalPhotos

Geographic subdivisions for Croton setiger:
CA-FP, w D;
Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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.
Blue line denotes eFlora flowering time.