Amphiachyris dracunculoides

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.

Annual, 3-8 dm, simple below, bushy- branched above; lvs numerous, linear, finely glandular-punctate, to 6 cm נ3 mm; heads numerous, campanulate or hemispheric; invol 3-6 mm; rays 6-10, 3-5 mm; achenes multinerved, villous-puberulent; 2n=8, 10. Dry soil on plains and prairies; Mo. and Kans. to Tex. and N.M.; Tenn.; Ala.; intr. in Ky. July- Oct. (Gutierrezia d.)

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

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