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Crassocephalum crepidioides

Common Name(s):
Redflower ragweed, Thickhead
Annuals, Herbs

Thickhead, in the Asteraceae family, is a recently introduced summer annual that is very similar to the more common American burnweed (Erechtites hieraciifolius (L.)). Seedlings form a rosette of elliptic leaves with toothed margins; midveins are often tinged red. Compared to American burnweed, seedling leaves are thicker and more deeply veined. As plants mature they grow upright to about 4 feet with toothed leaves clasping the stem. Thickhead flowers lack petals but are red in color. Additionally, thickhead flowers droop downward as though the plants were experiencing moisture stress. Seeds are wind dispersed and can produce multiple generations each growing season. Thickhead is mangaed by most broad-spectrum herbicides; however, herbicide efficacy rankings for this species are based on limited experimental data.


NCCES plant id: 3050

Crassocephalum crepidioides Seedling
Crassocephalum crepidioides Leaf
Crassocephalum crepidioides Inflorescence
Crassocephalum crepidioides Flower heads