Portulaca(redirected from Portulacas)
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plant genus in the family Portulacaceae. Contains high concentrations of oxalic acid and sometimes nitrate, either of which can cause fatal poisoning in hungry stock. Manifested by recumbency and high mortality in sheep. Includes P. australis, P. filifolia, P. oleracea (pigweed, purslane), P. sp.aff. oleracea (munyeroo, inland pigweed).