Euphorbia species - Spurges
Euphorbia peplus - Petty Spurge
This is the commonest weedy spurge. The flowerheads are green with slender crescent-shaped lobes. The leaves are untoothed which differentiates it from E. helioscopia.
Euphorbia helioscopia - Sun Spurge
Euphorbia cyparissias - Cypress Spurge
This has very distinctive thin leaves.
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