Abstract
Laticifer distribution is described in several genera of Euphorbiaceae, particularly in subfamily Crotonoideae, previously neglected in this respect. Branched, nonarticulated laticifers are common in both Crotonoideae and Euphorbioideae, sparse in Acalyphoideae (occurring in, e.g., Omphalea), and absent in the other two subfamilies. However, many genera without latex have elongated, highly branched sclereids in the mesophyll, which may in some instances be homologous with laticifers. Typical articulated laticifers (consisting of numerous fused cells) are currently known in only three genera of Crotonoideae, although several anomalous and transitional forms are reported. Crotonoideae differs from Euphorbioideae in that nonarticulated laticifers. Laticifer evolution is discussed in relation to the phylogeny of Euphorbiaceae
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