This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
Summary
DescriptionCenchrus robustus flowerhead1 Mark Tull (9542495573).jpg
Flowerheads are spike-like, mostly erect, dense, 3–11 cm long, with a slightly flexuose main stem. The spikelets are longer than the subtending bristles.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
https://creativecommons.org/licenses/by/2.0CC BY 2.0 Creative Commons Attribution 2.0 truetrue