Symphyotrichum pilosum

Symphyotrichum pilosum (formerly Aster pilosus) is a perennial, herbaceous, flowering plant in the Asteraceae family native to central and eastern North America. It is commonly called hairy white oldfield aster, frost aster, white heath aster, heath aster, hairy aster, common old field aster, old field aster, awl aster, nailrod, and steelweed. There are two varieties: Symphyotrichum pilosum var. pilosum, known by the common names previously listed, and Symphyotrichum pilosum var. pringlei, known as Pringle's aster. Both varieties are conservationally secure globally and in most provinces and states where they are native. The varieties differ in morphology, distribution, and habitat; S. pilosum var. pilosum is hairy, and S. pilosum var. pringlei is hairless, or nearly so. S. pilosum var. pilosum is the more widespread of the two and grows in various dry habitats, often with weeds. S. pilosum var. pringlei grows in higher-quality calcium-rich ecosystems, often with many non-weedy compani......read more on Wikipedia.