Fls all ligulate and perfect, yellow; invol campanulate, becoming broader in fr, its bracts equal and uniseriate, becoming keeled with an enlarged and indurate midrib in fr, rarely minutely and scantily calyculate; achenes obovoid, 8–10-ribbed, some of the ribs commonly stronger than the others and making the achenes subangular; pappus none; branching, annual, lactiferous herbs with well developed basal lvs, the stem sparsely and minutely bracteate or essentially naked, becoming simple, monocephalous, and strictly scapose in depauperate plants. Monotypic.
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