Euphorbia oblongata

Grisebach

Spic. Fl. Rumel. 1: 136. 1843.

Common names: Egg-leaf or oblong spurge
WeedyIntroduced
Synonyms: Tithymalus oblongatus (Grisebach) Soják
Treatment appears in FNA Volume 12. Treatment on page 305. Mentioned on page 240, 295, 306.

Herbs, perennial, with woody taproot. Stems erect, unbranched or densely branching, 80 cm, often densely villous (especially young stems and pleiochasial branches). Leaves: petiole absent; blade oblong to narrowly obovate or lanceolate, 15–70 × 6–25 mm, base rounded or truncate, margins finely serrulate, apex obtuse, mucronulate, surfaces glabrous; venation inconspicuously pinnate, midvein prominent. Cyathial arrangement: terminal pleiochasial branches 3–5, each 2–3 times 2–4-branched; pleiochasial bracts ovate, similar in size to distal leaves; dichasial bracts distinct, ovate to suborbiculate, base truncate or rounded, margins entire or finely denticulate, apex obtuse, sometimes mucronulate; axillary cymose branches 0–4. Cyathia: peduncle 1–5 mm. Involucre cupulate to slightly turbinate, 1.5–2.5 × 1.3–1.5 mm, glabrous; glands 2–3, elliptic, 0.6–0.8 × 0.8–1.2 mm; horns absent. Staminate flowers 15–40. Pistillate flowers: ovary glabrous; styles 1.5–2 mm, 2-fid. Capsules globose, 3–4.5 × 3–4.5 mm, slightly 3-lobed; cocci rounded, verrucose-tuberculate, glabrous; columella 2.5–3.3 mm. Seeds brown, ovoid, 2.4–2.6 × 1.3–2 mm, smooth, caruncle reniform, 0.2–0.3 × 0.8–0.9 mm.


Phenology: Flowering and fruiting spring–fall.
Habitat: Waste areas, disturbed sites, roadsides, fields, pastures.
Elevation: 30–900 m.

Distribution

V12 622-distribution-map.jpg

Introduced; Calif., Oreg., Wash., s Europe.

Discussion

Euphorbia oblongata is listed as a noxious weed by the states of California, Oregon, and Washington.

Selected References

None.

Lower Taxa

None.
... more about "Euphorbia oblongata"
Ricarda Riina +, Dmitry V. Geltman +, Jess A. Peirson +  and Paul E. Berry +
Grisebach +
Egg-leaf or oblong spurge +
Calif. +, Oreg. +, Wash. +  and s Europe. +
30–900 m. +
Waste areas, disturbed sites, roadsides, fields, pastures. +
Flowering and fruiting spring–fall. +
Spic. Fl. Rumel. +
Weedy +  and Introduced +
Tithymalus oblongatus +
Euphorbia oblongata +
Euphorbia subg. Esula +
species +