Helianthus ciliaris
A low-growing bluish annual that often forms monotypic stands in clayey playas and ephemeral lakes.
Plant habit at Flat Lake, 3 Aug 2007.
A pseudanthium at Flat Lake, 3 Aug 2007.
View of a pseudanthium from below, showing phyllaries, at Flat Lake, 3 Aug 2007.
Achenes at Flat Lake, 3 Aug 2007.