|Photo by Dennis Kalma|
|Helianthus decapetalus L.
Plant: 60-150 cm tall; stems smooth to slightly rough
Flower: yellow; flower is actually a composite head of flowers with 8-15 yellow ray flowers around the edge and a central disk with yellowish to brownish flowers.
Leaves: opposite, entire, toothed; a pair of lower veins prominent and run paralell to the central vein, upper surface smoothish; leafstalks longer than 6 mm and have wings extending along them from the blade
Habitat: moist woods, streambanks, thickets
Similar Species: Helianthus divaricatus is very similar but has thicker leaves with very short leafstalks (less than 6 mm) and the stalks do not havve wings extending along them from the blade, the upper surface of the leaf is rough. The guidebooks make distinguishing between these two species sound easy - it is not. Many specimens seem to have intermediate characters.