Tripleurospermum maritimum subsp. phaeocephalum
Acta Bot. Fenn. 75: 9. 1967.
Phyllaries broadly triangular, scarious margins blackish brown, 0.4–1 mm wide. Cypselae: resin-gland lengths usually little more than twice widths. 2n = 18.
Phenology: Flowering Jul–Oct.
Habitat: Low Arctic seashores and beaches (near high tide strand line), moist to moderately well-drained areas, gravel, sand, moss
Elevation: 0–50 m
Greenland, Man., N.W.T., Nunavut, Ont., Que., Yukon, Alaska, arctic Eurasia
Subspecies phaeocephalum occurs along the low Arctic shore (both continental and insular) from Alaska to Quebec; it does not penetrate north into the Canadian Arctic Archipelago; it does not reach Labrador; it is present in Greenland. If treated as a species, the name T. hookeri Schultz-Bipontinus has priority (N. N. Tzvelev 2002b).