Cotyledons are elliptical to ovate, and first true leaves are round.  Prostrate spurge (Chamaesyce maculata) seed can germinate in 5 days from being sown, and grow to maturity within 5 weeks.  This makes prostrate spurge capable of spreading throughout a nursery very rapidly.

Note above the small size of the cotyledons.  These would be difficult to see, in fact, it's been my experience that spurge seedlings are camouflaged against the color of bark, and they are difficult to spot until they develop one or more sets of true leaves.

Note below the number of seedlings that germinated at one time.  This large number of small plants makes hand-weeding difficult.

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