2.
Amphiachyris dracunculoides
(de Candolle) Nuttall, Trans. Amer. Philos. Soc., n. s. 7: 313. 1840.
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.
2
n
= 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.
