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4. Euphorbia subg. Tirucalli (Boissier) S. Carter, Kew Bull. 40: 823. 1985.
绿玉树亚属 lü yu shu ya shu
Euphorbia sect. Tirucalli Boissier in A. Candolle, Prodr. 15(2): 94. 1862.
Mostly trees; branches succulent, often striate. Leaves alternate, usually short-lived; stipules glandular. Cyathia clustered at stem apex, small, unisexual; cyathophylls very inconspicuous.
About ten species as here defined: most species in S Africa and Madagascar, with an outlying species on Socotra and one species (E. tirucalli) now widespread throughout the tropics; one species (introduced) in China.
Lower Taxon
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