Wholeleaf Rosinweed: Silphium integrifolium:
Asteraceae
Wholeleaf Rosinweed © RSWacha, 1998
Description:
Flowering heads have a central cluster of conspicuous yellow disc flowers, surrounded by 15 to 30 erect, radially-arranged, yellow ray flowers. Involucral bracts are ovate in shape. Leaves are paired, except near the upper part of stem, where they may attach individually. Leaves are broadly lance-shaped, pinnately veined, lack petioles, and attach directly to the stem. Leaf margins are either smooth, or have very small teeth spaced 0.5 to 1 cm apart. The upper surface of the leaf is sandpaper-like. Stems are somewhat square-shaped. This is a tall plant, occurring in roadsides, prairies, and prairie plantings, from July into September. This species differs from Helianthus maximiliani by having broader leaves and wider involucral bracts. Native to N. A.