|Jepson Flora Project: Jepson Interchange|
|TREATMENT FROM THE JEPSON MANUAL (1993)||
previous taxon |
Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY
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 35, free or fused; petals generally 0; stamens 1many, free or filaments fused; ovary superior, chambers 14, styles free or fused, simple or lobed
Fruit: generally capsule
Seeds 12 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 48:303430]
Many species ± highly TOXIC.
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 5many, 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 35:127147]
Horticultural information: STBL.
AnnualSee the CNPS Inventory for information about endangerment and rarity.
Stem erect, < 2.5 dm, hairy
Leaves opposite, 25 cm, petioled; stipules gland-like; blade linear to lanceolate, hairy, tip acute, margin finely toothed
Inflorescence 1 per node; involucre 12 mm, bell-shaped, hairy; gland < 0.5 mm, oblong, appendage = to or wider than gland, 24-lobed
Staminate flowers 814
Pistillate flower: style divided > 1/2 length
Fruit 2.53.4 mm, spheric, lobed, hairy
Seed 23 mm, oblong, 4-angled, transversely 23-ridged, tubercled, gray to brown or white
Ecology: Rocky slopes
Elevation: 18002000 m.
Bioregional distribution: e Desert Mountains (Clark Mtns)
Distribution outside California: to Texas, Mexico
Other vars. in sw US, Mex.