Sibara includes 12 species exhibiting amphitropical disjunction. Six of these grow in California and Baja California, and six in northern Chile and Argentinean Mendoza and Patagonia. The new species S. davidsonii and S. dilloniorum are described from Baja California and Chile, respectively. The genera Pterygiosperma and Werdermannia are reduced to synonymy of Sibara, and the new combinations S. anethifolia, S. macrostachya, S. mendocina, S.pinnata, and S. tehuelches are proposed. Four species described by Philippi in Nastrutium and Sisymbrium are lectotypified.
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