Solenostoma rubrum var. underwoodii Bakalin,

Polish Bot. J. 58 (1): 131, 2013 (see Bakalin 2013).

TYPE: “ Holotype. USA: Washington, King Co., Seattle, 12 Apr. 1891, C. V. Piper 21 (NY 564814). Isotypes. USA: Washington, King Co., Seattle, 12 Apr. 1891, C. V. Piper (NY 564815, 564817). Paratype. USA: Washington, Thurston Co., Olympia, 19 Apr. 1981 L. F. Henderson 2596 (NY 564816)” .

NOTE: This name also creates the autonym.