A wild Eryngo blossom (looks like a thistle, but more closely related to carrots and parsnips): late summer in the LBJ National Grassland, north TX.

Available for royalty-free licensing via Alamy: http://www.alamy.com/stock-photo-a-wild-eryngo-blossom-looks-like-a-thistle-but-more-closely-related-105718730.html

PENTAX K-5, smc PENTAX-DA 18-55mm F3.5-5.6 AL WR at 50 mm
1/640 sec, f/5.6, ISO 400
Processed in Lightroom