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Silphium
Also called Rosinweeds, Prairie Dock, Rosin Weed
Silphium is a genus of North American plants in the tribe Heliantheae within the family Asteraceae.
Members of the genus, commonly known as rosinweeds, are herbaceous perennial plants growing to 0.2 m (8 in) to more than 2.5 m (8 ft 2 in) tall, with yellow (rarely white) flowerheads that resemble sunflowers. In the rosinweeds, the ray florets in the head are female and the disc florets are male; this differs from sunflowers, where ray florets are sterile and disc florets are perfect, capable of producing both pollen and seeds.
White rosinweed · Starry rosinweed · Cumberland rosinweed · Kidneyleaf rosinweed · Wholeleaf rosinweed · Compassplant · Mohr's rosinweed · Cup plant · Old Cahaba rosinweed · Tansy rosinweed · Roughstem rosinweed · Prairie rosinweed
Text excerpted from the Wikipedia article Silphium (genus) by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
