Sagittaria graminea Michx. ssp. graminea > Sagittaria graminea Michx. ssp. weatherbiana (Fernald) R.R. Haynes & Hellq.

Washington: Snohomish County: Southeast shore of Lake Roesinger, 14 air kilometers north-northeast of Monroe. Elev. 570 ft.
47° 58.8' N, 121° 54.9' W; T29N R7E S21
With Phalaris arundinacea, Potentilla palustris, Iris pseudacorus, Carex obnupta. White flowers 25-29 milimeters diameter, stem triangular, emersed leaves narrowly elliptic, submersed leaves 0.9-2.0 centimeters white; female pedicles 3-4.5 cintimeters long; rhizomatous, common in 20-30 centimeters water. Phenology: Flowers.

Peter F. Zika 19827, Jun 6, 2004
WTU, Accession: 358899