Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora.

EUPHORBIACEAE

SPURGE FAMILY

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.

EUPHORBIA

SPURGE

Daryl L. Koutnik

Annual, perennial herb, generally monoecious, glabrous or hairy
Stem ascending to erect, < 1 m; branches forked, forks equal
Leaves cauline, generally alternate; stipules 0 or gland-like; petiole present or 0; leaf base symmetrical
Inflorescence flower-like or not, generally clustered; clusters generally umbel-like or cyme-like; involucre ± bell-shaped; bracts 5, fused; glands generally 4, distal appendages generally 0; flowers central
Staminate flowers 5–many, generally in 5 clusters around pistillate flower
Pistillate flower 1, central, stalked; ovary chambers 3, ovule 1 per chamber, styles 3, separate or fused at base, divided or entire
Fruit: capsule, round to 3-angled or -lobed in X -section
Seed round or angled in X -section; surface smooth or sculptured, generally with a knob-like structure at attachment scar
Species in genus: ± 1500 species: warm temp to tropical, worldwide. See Chamaesyce
Etymology: (Latin: Euphorbus, Physician to the King of Mauritania, 1st century)
Reference: [Wheeler 1936 Bull S Calif Acad Sci 35:127–147]
Horticultural information: STBL.

Native

E. exstipulata Engelm. var. exstipulata

CLARK MOUNTAIN SPURGE

Annual
Stem erect, < 2.5 dm, hairy
Leaves opposite, 2–5 cm, petioled; stipules gland-like; blade linear to lanceolate, hairy, tip acute, margin finely toothed
Inflorescence 1 per node; involucre 1–2 mm, bell-shaped, hairy; gland < 0.5 mm, oblong, appendage = to or wider than gland, 2–4-lobed
Staminate flowers 8–14
Pistillate flower: style divided > 1/2 length
Fruit 2.5–3.4 mm, spheric, lobed, hairy
Seed 2–3 mm, oblong, 4-angled, transversely 2–3-ridged, tubercled, gray to brown or white
Ecology: Rocky slopes
Elevation: 1800–2000 m.
Bioregional distribution: e Desert Mountains (Clark Mtns)
Distribution outside California: to Texas, Mexico
Other vars. in sw US, Mex.
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for EUPHORBIA%20exstipulata%20var.%20exstipulata being generated
 
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Euphorbia exstipulata var. exstipulata
Retrieve dichotomous key for Euphorbia
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
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