Euphorbia serrata

Linnaeus

Sp. Pl. 1: 459. 1753.

Common names: Saw-toothed or toothed or serrate spurge
WeedyIntroduced
Synonyms: Galarhoeus serratus (Linnaeus) Haworth Tithymalus serratus (Linnaeus) Hill
Treatment appears in FNA Volume 12. Treatment on page 309. Mentioned on page 296.
Revision as of 19:13, 5 November 2020 by imported>Volume Importer
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Herbs, perennial, with thick rootstock. Stems erect, branched, 10–70 cm, glabrous. Leaves: petiole absent; blade lanceolate, ovate-lanceolate, linear, or linear-lanceolate, 10–70 × 2–20 mm, base acute or obtuse, margins irregularly serrate, apex acute to obtuse, surfaces glabrous; venation inconspicuous, only midvein prominent. Cyathial arrangement: terminal pleiochasial branches 3–5, each 1–3 times 2-branched; pleiochasial bracts ovate-lanceolate, usually shorter and wider than distal leaves; dichasial bracts distinct, ovate or deltate, base obtuse to cordate, margins irregularly dentate, apex acute, or obtuse, mucronate; axillary cymose branches 0–3. Cyathia: peduncle 1–5 mm. Involucre campanulate, 2–4 × 1.2–3 mm, glabrous; glands 4–5, elliptic, ovate, or suborbiculate, 1.2–1.8 × 1.5–2.7 mm; horns absent or slightly divergent, 0–0.6 mm. Staminate flowers 20–40. Pistillate flowers: ovary glabrous; styles 1–2 mm, 2-fid. Capsules subovoid, 4.5–6 × 4–5 mm, 3-lobed; cocci rounded, smooth occasionally slightly puncticulate, glabrous; columella 4–4.5 mm. Seeds grayish, cylindric, 2.5–3.1 × 1.7–2 mm, smooth or slightly dotted; caruncle subconic, lobed, 1–1.5 × 0.5–1 mm.


Phenology: Flowering and fruiting spring–fall.
Habitat: Waste places, disturbed sites, roadsides, fields, pastures.
Elevation: 0–300 m.

Distribution

V12 1065-distribution-map.jpg

Introduced; Calif., Europe, Atlantic Islands (Macaronesia).

Discussion

Euphorbia serrata, native to the western Mediterranean region of Europe and Macaronesia, is listed as a noxious weed by the state of California. In the flora area, it has been found in coastal counties from Sonoma to Monterey counties; attempts to eradicate it may have been successful.

Selected References

None.

Lower Taxa

None.
... more about "Euphorbia serrata"
Ricarda Riina +, Dmitry V. Geltman +, Jess A. Peirson +  and Paul E. Berry +
Linnaeus +
Saw-toothed or toothed or serrate spurge +
Calif. +, Europe +  and Atlantic Islands (Macaronesia). +
0–300 m. +
Waste places, disturbed sites, roadsides, fields, pastures. +
Flowering and fruiting spring–fall. +
Weedy +  and Introduced +
Galarhoeus serratus +  and Tithymalus serratus +
Euphorbia serrata +
Euphorbia subg. Esula +
species +