Calystegia silvatica (Kit.) Griseb. ssp. disjuncta Brummitt
[= Calystegia ×lucana]

Washington: Pierce County: East shore of Nisqually River, just north of bridge on Fort Lewis Road, 4.4 air kilometers west of Lewis Lake, Joint Base Lewis-McChord. Elev. 30 m.
46.9878° N, 122.6318° W
Coordinate Source: Specimen Label.
Partly shaded riverbank, with Alnus rubra, Physocarpus, Phalaris arundinacea, Aster subspicatus. White flowers, 70-74 millimeters long, stamens 31 millimeters, anthers 7 millimeters, bracts overlap; locally common vine. Phenology: Flowers.

Peter F. Zika 28950B, Aug 10, 2017
With Rod Gilbert, Sarah Krock
WTU, Accession: 416887, Barcode: WTU-V-036546