Plants in which the inflorescence consists of numerous small flowers (florets) brought together into a dense head, the base of which is enclosed by a common envelope. (Examples, the Daisy, Dandelion, etc. )

The filamentous weeds of fresh water.

A rock made up of fragments of rock or pebbles, cemented together by some other material.

The second envelope of a flower usually composed of coloured, leaf-like organs (petals), which may be united by their edges either in the basal part or throughout.

The normal coincidence of one phenomenon, character, etc. , with another.

A bunch of flowers in which those springing from the lower part of the flower stalks are supported on long stalks so as to be nearly on a level with the upper ones.