COMOSÆ, in Botany, from Coma; an order of plants in the former edition of Linnaeus's Fragments of a Natural Method, consisting of the spiked willow or spirea frutex, dropwort, and greater meadow-sweet. These, though formerly distinct genera, are by Linnaeus collected into one, under the name of spira. The flowers growing in a head, resemble a bush, or tuft of hair, which probably gave rise to the epithet Comosæ.