OregonFlora: Euphorbia polycarpa vs. Euphorbia glyptosperma

	Euphorbia polycarpa	Chamaesyce glyptosperma (synonym of Euphorbia glyptosperma)
		currugate-seeded spurge, ribseed sandmat, ridge-seeded spurge
Habit		Plants annual; stems prostrate, 4–40 cm, glabrous; taprooted.
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.
Inflorescences		involucres 0.5–1 mm, glabrous; glands elliptic; gland appendages white.
Fruits		ovoid, 1.5–2 mm, glabrous.
Seeds		ovoid, 1–1.5 mm; cross-ridged.

	Euphorbia polycarpa	Chamaesyce glyptosperma
Distribution	[WildflowerSearch map] [BONAP county map]	[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.
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		Euphorbia glyptosperma
Web links	Local floras: CA 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: 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 polycarpa

Chamaesyce glyptosperma

(synonym of Euphorbia glyptosperma)

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

Habit

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

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.

Inflorescences

involucres 0.5–1 mm, glabrous;

glands elliptic;

gland appendages white.

Fruits

ovoid, 1.5–2 mm, glabrous.

Seeds

ovoid, 1–1.5 mm; cross-ridged.

Euphorbia polycarpa

Chamaesyce glyptosperma

Distribution

[WildflowerSearch map]

[BONAP county map]

[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.

Source

Flora of Oregon, volume 2, page 643
Stephen Meyers

Sibling taxa