Euphorbia dentata

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leaves and inflorescences--What is the leaf shape here?  Also, notice the toothed margins. inflorescence closeup--in the genus Euphorbia, there is a special kind of inflorescence called a cyathium, which resembles a perfect flower, but actually is composed of separate male and female flowers.  Also, notice the lobing on the young fruits.  In the Euphorbiaceae, most species have a three-lobed fruit very similar to the ones you see here.
In this species, the leaves nearest the cyathia often develop white (and sometimes reddish) centers.  What function might this serve? more cyathia, with developing fruits