[Helianthus grosseserratus f. plenifolius M.Martens, more]
Etymology: Helianthus: derived from two Greek words helios, "sun," and anthos, "flower," in reference to the sunflower's supposed tendency to always turn toward the sun
Plants: erect, perennial, 2'-10' tall forb; stems usually smooth below inflorescence, but sometimes with a whitish fuzz
Leaves: opposite along the lower stem, center and upper alternate; lance-like, usually with sharp teeth, upper surface slightly rough, lower surface with short whitish hairs, often folded upward along the midrib, stalk usually winged
Flowers: head 2 1/4" - 4 1/2" wide, 10-20 yellow rays, spreading bracts (phyllaries) longer than the yellow disk; inflorescence in large, loose clusters with many heads on stalks more than 4" long; blooms July-Oct.
Habitat: full sun; wet to moderate moisture; prairies, marshes; in sandy, loamy soil
Conservation Status: Native
Flora of North America: Flora of North America Floristic Rating: Coefficient of Conservatism = 2, Wetland Indicator = FACW- Atlas of the Wisconsin Prairie and Savanna Flora: by T.S. Cochrane & H.H. Iltis: habitat, distribution infomation / flowering and fruiting times USDA Plants Database: Federal Distribution and detailed information including photos USGS - Northern Prairie Wildlife Research Center: Wetland Plants and Plant Communities of Minnesota and Wisconsin Dan Tenaglia's The Missouri Flora: Fabulous photographs; detailed descriptions; color and leave arrangement key. Illinois Wildflowers: Wonderful photographs; detailed descriptions; color and leaf arrangement key