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1c. Xanthisma texanum de Candolle var. drummondii (Torrey & A. Gray) A. Gray, Smithsonian Contr. Knowl. 3(5): 98. 1852.
Centauridium drummondii Torrey & A. Gray, Fl. N. Amer. 2: 246. 1842; Xanthisma texanum subsp. drummondii (Torrey & A. Gray) Semple
Phyllaries abruptly expanded distal to stalks, bodies mostly ovate (3.5–8 × 2.5–5 mm distal to widest point), apices acute to acuminate, flared distally, ovate portion 3.5–8 × 2.5–5 mm (distal to widest point). 2n = 8.
Flowering spring–fall. Prairies, open woods, pastures, and roadsides; 200–1000 m; Okla., Tex.
Variety drummondii was attributed to Arizona by J. T. Kartesz and C. A. Meacham (1999); if true, it would be an apparent introduction.
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