Noun | 1. | ![]() rosid dicot genus - a genus of dicotyledonous plants Apiaceae, carrot family, family Apiaceae, family Umbelliferae, Umbelliferae - plants having flowers in umbels: parsley; carrot; anise; caraway; celery; dill Sium suave, water parsnip - stout white-flowered perennial found wild in shallow fresh water; northern United States and Asia greater water parsnip, Sium latifolium - large stout white-flowered perennial found wild in shallow fresh water; Europe Sium sisarum, skirret - an Asiatic herb cultivated in Europe for its sweet edible tuberous root |