512 Aster azureus Asteraceae. Leaves on stalk are long and narrow with serrations. Basal leaves are spade shaped with a distinct petiole. Basal leaves have a branchy venation and are usually rough with no serrations.
Rosettes are similar to basal leaves.
Flowerhead is large and branching with many pale purple daisylike flowers with a yellow center. Solidago rigida basal leaves, Aster simplex and Aster eracoides . Solidago rigida has more oval leaves with round serrations and soft pubescence. Aster simplex and A. eracoides have white flowers. Aster simplex basal leaves are longer and more linear.