Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Cotula is a genus of flowering plant in the Asteraceae family. It includes about 80 species of plants known generally as water buttons or buttonweeds. The species within this genus can vary extensively in their habit, leaf division, involucre, receptacle and achenes. This makes it difficult to define them by comparing their morphology. The genus can only be defined by looking at the corollas of their flowers. Most are disciform (lacking ray florets). These corollas may be tubular, reduced or even absent. Another characteristic are their solitary heads growing on a peduncle.

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