Hymenopappus artemisiifolius, the oldplainsman or wooly-white, is a North American species of flowering plant in the daisy family. It has been found only in the south-central United States, in Texas, Arkansas, and Louisiana. Its natural habitat is in sandy soils of prairies and open woodlands.

Hymenopappus artemisiifolius is a biennial herb up to 100 cm (39 in) tall. It produces 20-60 flower heads per stem, each head with 40–60 white, yellow, purple, or red disc flowers but no ray flowers. Its flowers attract butterflies.

Varieties

• Hymenopappus artemisiifolius var. artemisiifolius - Texas, Arkansas, Louisiana
• Hymenopappus artemisiifolius var. riograndensis B.L.Turner - Río Grande Valley in southern Texas

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