Subgenus
Esula (Euphorbia)
Euphorbia crenulata. Photo: (c) 2006 Keir Morse, some rights reserved (CC BY-NC-SA)
Euphorbia is a very large and diverse genus of flowering plants, commonly called spurge, in the spurge family (Euphorbiaceae). “Euphorbia” is sometimes used in ordinary English to collectively refer to all members of Euphorbiaceae (in deference to the type genus), not just to members of the genus. Some euphorbias are commercially widely available, such as poinsettias at Christmas. Some are commonly cultivated as ornamentals, or collected and highly valued for the aesthetic appearance of their unique…
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