Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

  • Up-to-date information about California vascular plants is available from the Jepson eFlora.



Grady L. Webster, except as specified

Annual, perennial herb, shrub, tree, vine, monoecious or dioecious
Stem generally branched, sometimes fleshy or spiny
Leaves generally simple, alternate or opposite, generally stipuled, petioled; blade entire, toothed, or palmately lobed
Inflorescence: cyme, panicle, raceme, spike; flowers sometimes in clusters (dense, enclosed by involucre, flower-like in Chamaesyce, Euphorbia ), terminal or axillary
Flower unisexual, ± radial; sepals generally 3–5, free or fused; petals generally 0; stamens 1–many, free or filaments fused; ovary superior, chambers 1–4, styles free or fused, simple or lobed
Fruit: generally capsule
Seeds 1–2 per chamber; seed scar appendage sometimes present, pad- to dome-like
Genera in family: 300 genera, 7500 species: ± worldwide especially tropical; some cultivated (Aleurites , tung oil; Euphorbia subsp.; Hevea , rubber; Ricinus )
Reference: [Webster 1967 J Arnold Arbor 48:303–430]
Many species ± highly TOXIC.



Daryl L. Koutnik

Annual, perennial herb, generally monoecious, glabrous to hairy; sap milky
Stem prostrate to erect, < 5 dm; branches alternate
Leaves cauline, opposite, short-petioled; stipules present; blade base generally asymmetric, veins dark green
Inflorescence flower-like, generally 1 per node; involucre ± bell-shaped, bracts 5, fused; glands 4, distal appendages generally colorful, petal-like; flowers central
Staminate flowers 3–many, generally in 5 clusters around pistillate flower, each flower a stamen
Pistillate flower 1, central, stalked; ovary chambers 3, ovule 1 per chamber, styles 3, separate or fused at base, divided to entire
Fruit: capsule, round to 3-angled or -lobed in X -section
Seed generally 4-angled, smooth or sculptured
Species in genus: ± 250 species: dry temp, subtropical worldwide, especially Am. Often treated as subg. of Euphorbia
Etymology: (Greek: ancient name for kind of prostrate plant)
Reference: [Wheeler 1941 Rhodora 43:97–154, 168–286]
Horticultural information: STBL.


C. ocellata (Durand & Hilg.) Millsp.

Stem prostrate, glabrous to hairy
Leaf 4–15 mm; stipules separate, thread-like; blade ovate to lanceolate, glabrous to hairy, tip acute to obtuse, margin entire, rolled down
Inflorescence: involucre 1.5–2 mm, obconic to bell-shaped, glabrous to hairy; gland < 1 mm, round, appendage wider than gland or 0
Staminate flowers 40–60
Pistillate flower: style divided 1/2 length
Fruit 2–2.5 mm, spheric, lobed, glabrous to hairy
Seed 1.5–2 mm, ovoid, widely 3-angled, smooth to shallowly wrinkled, white
Ecology: Sandy soils
Elevation: < 800 m.
Bioregional distribution: California Floristic Province (except Peninsular Ranges), Desert
Distribution outside California: to Utah, Arizona
Synonyms: Euphorbia o. Durand & Hilg


subsp. rattanii (S. Watson) Koutnik


Stem hairy
Leaf < 10 mm; blade ovate, acute, hairy
Inflorescence: involucre hairy; gland appendage wider than gland, white
Ecology: UNCOMMON. Sandy or stony ground
Elevation: < 100 m.
Bioregional distribution: n Sacramento Valley (Glenn, Tehama cos.)
Synonyms: Euphorbia o. var. r. (S. Watson) L.C. Wheeler
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for CHAMAESYCE%20ocellata%20subsp.%20rattanii being generated

Retrieve Jepson Interchange Index to Plant Names entry for Chamaesyce ocellata subsp. rattanii
Retrieve dichotomous key for Chamaesyce
Overlay Consortium of California Herbaria specimen data by county on this map
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