Cup Plant (Silphium perfoliatum)
A tall plant that can grow to 6 feet or even more, Cup Plant's yellow blossoms can be seen starting in July when the butterflies visit them, and then later when the birds begin to feed on its seeds. Pairs of leaves clasp the stem forming little cups, hence the name – it’s like growing a crop of tiny bird baths for bees, birds, and butterflies. Cup Plant establishes well in average garden soil or in heavier, wetter soils. It can spread with great enthusiasm; be prepared to split it if necessary and rehome divided plants to grateful gardeners.
(Image from Wikipedia)