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Helianthus ciliaris is a species of sunflower known by the common names Texas blueweed and yerba parda. It is native to much of the south-central United States and northern Mexico, but it can be found elsewhere in North America where it is an introduced species and often a noxious weed. It is weedy even in much of its native range, growing readily in disturbed areas, on cultivated land, and along the roadside. It grows well in moist areas such as drainage ditches. This is a perennial herb with distinctive blue-green foliage growing to heights of 40 to 70 centimeters. It has a tough, horizontally spreading root system which sprouts new plants at distances from the parent, and can also sprout after being fragmented, so plowing the plant under can actually help it spread. The leaves are variable in size, shape, and arrangement, but are generally lance-shaped and wavy with rough hairs along the edges. The inflorescence holds a mass of yellow-tipped red disc florets often surrounded by a fringe of several curling yellow ray florets, although some heads lack ray florets.
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