Jerusalem Artichoke
 

Helianthus tuberosus
A large, branched 4-10' plant with a rough, hairy, grooved stem. The lower leaves are opposite, the upper are alternate, and the leafstalks are winged. The rough leaves are lance-shaped to ovate and toothed. The up to 3" flowers have 12-20 ridged, bright yellow rays. The 1/2" disc seems small for the size of the flower. The narrow, dark green bracts are spreading. Blooms August-October in damp fields, thickets, along streams.