Prairie broomweed

Brachyris dracunculoides de Candolle, Mém. Soc. Phys. Genève 7: 265. 1836; Gutierrezia dracunculoides (de Candolle) S. F. Blake; Xanthocephalum amoenum Shinners var. intermedium Shinners

Plants 30–100(–200) cm. Primary stems 0.3–1(–2) mm diam. Leaf blades narrowly to broadly lanceolate, 5–60 × 0.5–6 mm. Heads in crowded corymbiform arrays. Phyllaries 2–3 × 1–2 mm. Receptacles deeply pitted, glabrous. Cypselae 1.2–2.2 mm, 7–9-ribbed, short-setulose. 2n = 10 (rarely 8).

Flowering Jul–Nov. Calcareous, clay, or sandy soils, disturbed habitats; 0–500 m; Ala., Ark., Ill., Ind., Iowa, Kans., Ky., La., Miss., Mo., Nebr., N.Mex., Okla., Ohio, Pa., S.C., Tenn., Va.

Amphiachyris dracunculoides is common in the south-central states, often in relatively large populations.