Alopecurus pratensis - flowers closed (left) and open; comparison of the two. Locality: Loděnice, Beroun.
<a href="//commons.wikimedia.org/wiki/User:Vojtech.dostal" title="User:Vojtech.dostal">Vojtech.dostal</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>