Tetragonotheca texana

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habit and habitat in Spring--Tetragonotheca texana is an herbaceous perennial that inhabits calcareous soils with little vegetation head, showing the sparse-looking rays and the square involucre--the "tetragono" in Tetragonotheca means four-angled and refers to the square involucre.  This is an easy-to-recognize species of Asteraceae as a result!
head again, showing open disk flowers--do you see the actinomorphic disk corollas? unopened head, showing the four phyllaries that make up the square involucre