Eleocharis macrostachya Britt. × Eleocharis obtusa (Willd.) Schult.

Washington: King County: Foster Golf Links near south shore of Duwamish River, near junction of Interurban Avenue and South 139th Street, Tukwila. Elev. 5 m.
47.479° N, 122.263° W
Coordinate Source: Specimen Label.
In small muddy sunny ponds, with Juncus acuminatus, Eleocharis macrostachya, E. obtusa. Odd form with well-developed terminal sheath teeth, rhizomes like E. macrostachya, and well-developed perianth bristles and tubercles like E. obtusa; occasional to common. Phenology: Fruits.

Peter F. Zika 26889, Sep 6, 2014
WTU, Accession: 400870, Barcode: WTU-V-007386