Flowering stand. The Finnish species, Maianthemum bifolium, is about 15 cm (6") high, whereas this giant is at least double in size. Soil conditions? Weather? Genetics? You tell me. Pacific coast, OR, US. Wild. 1998-06-01.Maianthemum dilatatum (Wood) A. Nels. & J. F. Macbr. Engl.: false lily of the valley. Bot. syn.: Maianthemum kamtschaticum (J. F. Gmel. ex Cham.) NakaiPersonal use? Non-commercial use? Commercial use? Read the Fine Print. Comments? Tell me.