OregonFlora: Euphorbia glyptosperma vs. Euphorbia virgata

	Chamaesyce glyptosperma (synonym of Euphorbia glyptosperma)	Euphorbia esula (synonym of Euphorbia virgata)
	currugate-seeded spurge, ribseed sandmat, ridge-seeded spurge	leafy spurge
Habit	Plants annual; stems prostrate, 4–40 cm, glabrous; taprooted.	Herbs or subshrubs perennial, 3–7 dm; stems erect, glabrous and glaucous to sparsely pubescent.
Leaves	oblanceolate to elliptic or ovate, 3–10 mm, occasionally with central red spot; margins entire to shallowly toothed; tips rounded; surfaces glabrous; petioles 0.3–1 mm; stipules linear, often dissected, 1–1.5 mm.	lower leaves alternate, narrowly oblong to narrowly oblanceolate, 30–90 × 3–8(10) mm; margins entire; tips obtuse to acuminate; surfaces glabrous, sessile or occasionally short-petiolate; floral leaves opposite or whorled, broadly ovate, 1–1.5 cm; margins entire to slightly crenate, sessile.
Inflorescences	involucres 0.5–1 mm, glabrous; glands elliptic; gland appendages white.	involucres bell-shaped, 2–3 mm; glands 2-horned.
Fruits	ovoid, 1.5–2 mm, glabrous.	oblong, 3–3.5 mm.
Seeds	ovoid, 1–1.5 mm; cross-ridged.	ellipsoid, 2–2.5 mm,
±		smooth.
2n		=16, 20, 48, 60, 64.

	Chamaesyce glyptosperma	Euphorbia esula
Distribution	[WildflowerSearch map] [BONAP county map]	[BONAP county map]
Discussion	Dry areas, roadsides. Flowering Jun–Sep. 0–1600 m. BW, Col, ECas, Lava, Owy, Sisk, WV. CA, ID, NV, WA; southern Canada and most of US except southeastern states, Mexico. Native.	Roadsides, disturbed areas. Flowering May–Jul. 0–1400 m. BW, CR, ECas, Lava, Sisk. CA, ID, NV, WA; throughout US except TX and southeastern states, Mexico; Asia, Europe. Exotic.
Source	Flora of Oregon, volume 2, page 643 Stephen Meyers	Flora of Oregon, volume 2, page 645 Stephen Meyers
Sibling taxa	C. glyptosperma, C. maculata, C. prostrata, C. serpens, C. serpillifolia	E. crenulata, E. cyparissias, E. dentata, E. esula, E. helioscopia, E. lathyris, E. myrsinites, E. oblongata, E. peplus, E. spathulata
Synonyms	Euphorbia glyptosperma	Euphorbia virgata
Web links	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Chamaesyce glyptosperma

(synonym of Euphorbia glyptosperma)

Euphorbia esula

(synonym of Euphorbia virgata)

currugate-seeded spurge, ribseed sandmat, ridge-seeded spurge

leafy spurge

Habit

Plants annual; stems prostrate, 4–40 cm, glabrous; taprooted.

Herbs or subshrubs perennial, 3–7 dm; stems erect, glabrous and glaucous to sparsely pubescent.

Leaves

oblanceolate to elliptic or ovate, 3–10 mm, occasionally with central red spot;

margins entire to shallowly toothed;

tips rounded;

surfaces glabrous;

petioles 0.3–1 mm;

stipules linear, often dissected, 1–1.5 mm.

lower leaves alternate, narrowly oblong to narrowly oblanceolate, 30–90 × 3–8(10) mm;

margins entire;

tips obtuse to acuminate;

surfaces glabrous, sessile or occasionally short-petiolate; floral leaves opposite or whorled, broadly ovate, 1–1.5 cm;

margins entire to slightly crenate, sessile.

Inflorescences

involucres 0.5–1 mm, glabrous;

glands elliptic;

gland appendages white.

involucres bell-shaped, 2–3 mm;

glands 2-horned.

Fruits

ovoid, 1.5–2 mm, glabrous.

oblong, 3–3.5 mm.

Seeds

ovoid, 1–1.5 mm; cross-ridged.

ellipsoid, 2–2.5 mm,

smooth.

=16, 20, 48, 60, 64.

Chamaesyce glyptosperma

Euphorbia esula

Distribution

[WildflowerSearch map]

[BONAP county map]

Discussion

Dry areas, roadsides. Flowering Jun–Sep. 0–1600 m. BW, Col, ECas, Lava, Owy, Sisk, WV. CA, ID, NV, WA; southern Canada and most of US except southeastern states, Mexico. Native.

Roadsides, disturbed areas. Flowering May–Jul. 0–1400 m. BW, CR, ECas, Lava, Sisk. CA, ID, NV, WA; throughout US except TX and southeastern states, Mexico; Asia, Europe. Exotic.

Source

Flora of Oregon, volume 2, page 643
Stephen Meyers

Flora of Oregon, volume 2, page 645
Stephen Meyers

Sibling taxa

C. glyptosperma, C. maculata, C. prostrata, C. serpens, C. serpillifolia