selected vouchers: WTU
Notes: FNA24: "Festuca rubra subsp. pruinosa grows in the crevices of rocks, in pilings, and occasionally on pebble or sand beaches, extending upward from the upper littoral zone of the Pacific and Atlantic coasts of North America and Europe.
Plants growing on coastal sands from California to Vancouver Island that are loosely cespitose and have abaxial sclerenchyma in large strands are sometimes distinguished as F. rubra subsp. arenicola E.B. Alexeev [= F. ammobia Pavlick]. The rhizomes are rarely present on herbarium specimens."