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1. Oxytenia acerosa Nuttall, Proc. Acad. Nat. Sci. Philadelphia. 4: 20. 1848.
Euphrosyne acerosa (Nuttall) Panero; Iva acerosa (Nuttall) R. C. Jackson
Leaves: petioles 0–20+ mm; blades or lobes mostly 20–150 × 1–1.5(–3) mm. Peduncles 1–3+ mm. Involucres 2–3+ mm. Phyllaries: outer 5–7 ± herbaceous, sericeous to strigillose, inner scarious to membranous, usually villous. Functionally staminate florets: corollas 2.5–3 mm. Paleae 1.8–2+ mm. Cypselae 1.5–2.5 mm. 2n = 36.
Flowering Jun–Sep. Wet or seasonally wet, alkaline soils; 100–2200 m; Ariz., Calif., Colo., Nev., N.Mex., Utah.
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