Publication: Fl. N.W. Coast. 147. 1915.
selected vouchers: WTU
Notes: FNA5: "Subspecies sitchana is sturdier than subsp. borealis and is readily distinguished by its leaf blades, which are narrowly lanceolate and widest at the base, and by its narrowly triangular, 3-veined sepals. It is a western taxon associated mainly with the slopes of the Coast Ranges and the Rocky Mountains. On the eastern side of its range and in the Aleutian Islands it tends to intergrade with subsp. borealis."