Annual Silver Hairgrass, Silver Hairgrass, Silver Hair-grass: Aira caryophyllea var. caryophyllea (Synonyms: Aira caryophyllea, Aira caryophyllea var. caryophyllea, Aspris caryophyllea)
Delicate Hairgrass: Aira elegantissima (Synonyms: Aira capillaris, Aira caryophyllea var. capillaris, Aira elegans, Aira elegans ssp. ambigua, Aspris capillaris)
Early Hairgrass, Early Silver Hair-grass, Little Hairgrass, Spike Hairgrass, Yellow Hairgrass, Yellow Hair-grass: Aira praecox (Synonym: Aspris praecox)