Oryzopsis hendersonii Vasey × Stipa lemmonii (Vasey) Scribn.

Washington: Kittitas County: Along Ellensburg-Wenatchee road, 5 miles south of Chelan County line.
T20N R21E S8 S17
Datum: NAD 27. Uncertainty: 805 meters. Coordinate Source: TRS2LL.
On a gently sloping east-facing hogback about 50 yards wide; apparently restricted to a band across the upper end of the hogback, with more Stipa above and more Oryzopsis below; sometimes growing with both Stipa and Oryzopsis, or with Oryzopsis alone; other hybrids were near edge of hogback near Agropyron and Festuca, which werer not common on the barren top. Plants forming small to large rounded tufts, centers decaying; panicle branches spreading to about 10 degrees or erect. Phenology: Flowers.

R. Spellenberg 1769, Jun 24, 1967
With M. Spellenberg
WTU, Accession: 250729