Bloom period:mid August to late October
C value:3
Notes:
Flora of Wisconsin
Illinois wildflowers
http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250067693
Very similar in appearance to Drummond's aster. Fortunately at PB (but not in general) the two can be distinguished by flower color: arrow leaved aster has white flowers and Drummond's aster has lavender flowers. Both have lower leaves heart shaped with winged petioles (leaf stems), but the leaves of arrow leaved aster tend to become relatively narrower up the stem while those of Drummond's aster tend to maintain their general proportions. The leaves of Drummond's aster have a "fuzzy" underside while those of narrow leaved aster have sparser rougher hairs. Drummond's aster also has a hairy stem, at least in the upper portion, while arrow leaved aster has a smooth stem throughout (or is very lightly hairy in the upper portion).
Illinois wildflowers
http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250067693
Very similar in appearance to Drummond's aster. Fortunately at PB (but not in general) the two can be distinguished by flower color: arrow leaved aster has white flowers and Drummond's aster has lavender flowers. Both have lower leaves heart shaped with winged petioles (leaf stems), but the leaves of arrow leaved aster tend to become relatively narrower up the stem while those of Drummond's aster tend to maintain their general proportions. The leaves of Drummond's aster have a "fuzzy" underside while those of narrow leaved aster have sparser rougher hairs. Drummond's aster also has a hairy stem, at least in the upper portion, while arrow leaved aster has a smooth stem throughout (or is very lightly hairy in the upper portion).