Thymophylla pentachaeta

Thymophylla pentachaeta, also known as fiveneedle pricklyleaf,^[2] golden dyssodia or dogweed, is a perennial or subshrub in the family Asteraceae.

Thymophylla pentachaeta
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Asterales
Family:	Asteraceae
Genus:	Thymophylla
Species:	T. pentachaeta
Binomial name
Thymophylla pentachaeta (DC.) Small
Synonyms[1]
Dyssodia pentachaeta (DC.) B.L.Rob. Hymenatherum pentachaetum DC.

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.^[3] T. acerosa is woodier, with leaves closer to the flowers.^[3]

Four varieties are recognised:^[1]

• 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,^[1] being found in arid climates.^[3]