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7c. Helianthus debilis Nuttall subsp. silvestris Heiser, Madroño. 13: 158, fig. 6. 1956.
Stems erect, glabrate. Leaf blades (6–)8–14 cm, margins serrate, abaxial faces densely gland-dotted. Peduncles (relatively slender) 20–40 cm. Ray laminae 15–23 mm. Discs 14–15(–16) mm diam. 2n = 34.
Flowering late spring–fall. Open areas , sandy soils with pine and oak; 10–100+ m; Tex.
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