OregonFlora: Euphorbia heterophylla vs. Euphorbia maculata

	Euphorbia heterophylla	Chamaesyce maculata (synonym of Euphorbia maculata)
		prostrate spurge, spotted sandmat, spotted spurge
Habit		Plants annual; stems prostrate, 5–50 cm, hairy; taprooted.
Leaves		linear-oblong to ovate-oblong, 5–15 mm, often with a central red spot; margins entire to shallowly toothed; tips rounded to acute; surfaces glabrous or hairy; petioles 0.5–1.5 mm; stipules slender, fringed, 0.3–0.9 mm.
Inflorescences		involucres 0.5–1 mm; hairy; glands elliptic; gland appendages white to pink.
Fruits		ovoid, 1–1.5 mm; hairy.
Seeds		ovoid to oblong, 0.7–1.3 mm, usually wrinkled, occasionally smooth.

	Euphorbia heterophylla	Chamaesyce maculata
Distribution	[WildflowerSearch map] [BONAP county map]	[WildflowerSearch map] [BONAP county map]
Discussion		Sidewalks, cracks in pavement, roadsides, disturbed areas. Flowering Jun–Sep. 0–1300 m. Casc, CR, ECas, Est, Lava, Sisk, WV. CA, ID, NV, WA; throughout North America except northern Canada. Native. Some sources speculate this species was originally native to eastern North America and was later introduced in other parts of the continent. Without definitive proof, however, we currently consider this species native.
Source		Flora of Oregon, volume 2, page 643 Stephen Meyers
Sibling taxa	E. crenulata, E. cyparissias, E. dentata, E. esula, E. helioscopia, E. lathyris, E. myrsinites, E. oblongata, E. peplus, E. spathulata	C. glyptosperma, C. maculata, C. prostrata, C. serpens, C. serpillifolia
Synonyms		Chamaesyce supina, Euphorbia maculata, Euphorbia supina
Web links	Local Web sites: 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: 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

Euphorbia heterophylla

Chamaesyce maculata

(synonym of Euphorbia maculata)

prostrate spurge, spotted sandmat, spotted spurge

Habit

Plants annual; stems prostrate, 5–50 cm, hairy; taprooted.

Leaves

linear-oblong to ovate-oblong, 5–15 mm, often with a central red spot;

margins entire to shallowly toothed;

tips rounded to acute;

surfaces glabrous or hairy;

petioles 0.5–1.5 mm;

stipules slender, fringed, 0.3–0.9 mm.

Inflorescences

involucres 0.5–1 mm; hairy;

glands elliptic;

gland appendages white to pink.

Fruits

ovoid, 1–1.5 mm; hairy.

Seeds

ovoid to oblong, 0.7–1.3 mm, usually wrinkled, occasionally smooth.

Euphorbia heterophylla

Chamaesyce maculata

Distribution

[WildflowerSearch map]

[BONAP county map]

[WildflowerSearch map]

[BONAP county map]

Discussion

Sidewalks, cracks in pavement, roadsides, disturbed areas. Flowering Jun–Sep. 0–1300 m. Casc, CR, ECas, Est, Lava, Sisk, WV. CA, ID, NV, WA; throughout North America except northern Canada. Native.

Some sources speculate this species was originally native to eastern North America and was later introduced in other parts of the continent. Without definitive proof, however, we currently consider this species native.

Source

Flora of Oregon, volume 2, page 643
Stephen Meyers

Sibling taxa