in botany, from Coma. An order of plants in the former editions of Linnæus's Fragments of a Natural Method, consisting of the spiked willow or spiraea frutex, dropwort, and greater meadow-sweet. These, though formerly distinct genera, are by Linnæus collected into one, under the name of spiraea. The flowers growing in a head, resemble a bush, or tuft of hair, which probably gave rise to the epithet Comosae.