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.
2
n
= 36.
Flowering Jun—Sep. Wet or seasonally wet, alkaline soils; 100—2200 m; Ariz., Calif., Colo., Nev., N.Mex., Utah.
