OregonFlora species comparison

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Euphorbia thymifolia

Euphorbia crenulata

western wood spurge
Habit Herbs or subshrubs annual or biennial, 1.5–5 dm; stems erect, glabrous.
Leaves

elliptic to spatulate, 10–35 mm × 4–12 mm;

margins entire to slightly crenate;

tips obtuse to acuminate;

surfaces glabrous; lower leaves alternate, sessile or with minute petioles; upper and floral leaves opposite or whorled, sessile.
Inflorescences

involucres bell-shaped, 2–3 mm;

glands 2-horned.
Fruits

oblong, 3–3.5 mm.
Seeds

round to oblong, 1.5–2.5 mm, with reticulate pitting.

Euphorbia thymifolia

Euphorbia crenulata
Distribution
[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
Discussion

Dry areas. Flowering Apr–Jul. 0–1600 m. Casc, CR, ECas, Est, Sisk, WV. CA, NV; AZ, CO. Native.

Euphorbia crenulata greatly resembles the European native E. peplus. They differ only in seed pitting characteristics and lower leaf petioles. Their genetic affinity is worthy of study.
Source Flora of Oregon, volume 2, page 645
Stephen Meyers
Sibling taxa
E. crenulata, E. cyparissias, E. dentata, E. esula, E. helioscopia, E. lathyris, E. myrsinites, E. oblongata, E. peplus, E. spathulata
E. cyparissias, E. dentata, E. esula, E. helioscopia, E. lathyris, E. myrsinites, E. oblongata, E. peplus, E. spathulata
Web links 
Unless otherwise noted, all data comes from OregonFlora.



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