Thymophylla pentachaeta, also known as fiveneedle pricklyleaf, golden dyssodia or dogweed, is a perennial or subshrub in the family Asteraceae.

The plant grows up to 20 centimetres (8 in) tall. The leaves are about 1.5 cm (1⁄2 in) long and pinnately divided. From April to October, atop leafless stalks are solitary yellow flower heads, 13 millimetres (1⁄2 in) wide, with 8–13 rays surrounding disk flowers. T. acerosa is woodier, with leaves closer to the flowers.

Four varieties are recognised:

• Thymophylla pentachaeta var. belenidium (DC.) Strother
• Thymophylla pentachaeta var. hartwegii (A.Gray) Strother
• Thymophylla pentachaeta var. pentachaeta
• Thymophylla pentachaeta var. puberula (Rydb.) Strother

The species is native to the southwestern and south-central United States, Mexico, and Argentina, being found in arid climates.

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