Goldenrod
(Solidago species)

Goldenrod is considered a wild flower in the US, but it is cultivated as an ornamental in Europe.  There are many species found in the Kansas City area.  The flower heads may be arranged in little clusters, in tall narrow spikes or in flat-topped clusters with graceful sprays at the top of the stem.  Plants may be as tall as fix foot or a small as a few inches. 

The species name refers to the healing properties of the plant; it is derived from the Latin word for healing.  The flowers are also used as dyes.