Hugh Knott: Achillea erba-rotta ssp moschata (Musk Milfoil)
Hugh Knott: Achillea erba-rotta ssp moschata (Musk Milfoil)
Hugh Knott: Achillea erba-rotta ssp moschata (Musk Milfoil)
Hugh Knott: Achillea macrophylla (Large-leaved Yarrow)
Hugh Knott: Achillea millefolium agg. (Yarrow)
Hugh Knott: Achillea nana (Dwarf Yarrow)
Hugh Knott: Achillea nana (Dwarf Yarrow)
Hugh Knott: Achillea nana (Dwarf Yarrow)
Hugh Knott: Adenostyles alliariae (Hedge-leaved Adenostyle)
Hugh Knott: Adenostyles alliariae (Hedge-leaved Adenostyle)
Hugh Knott: Adenostyles leucophylla (White-leaved Adenostyle)
Hugh Knott: Adenostyles leucophylla (White-leaved Adenostyle)
Hugh Knott: Antennaria carpatica (Carpathian Catsfoot)
Hugh Knott: Antennaria carpatica (Carpathian Catsfoot)
Hugh Knott: Antennaria carpatica (Carpathian Catsfoot)
Hugh Knott: Antennaria carpatica (Carpathian Catsfoot)
Hugh Knott: Antennaria carpatica (Carpathian Catsfoot)
Hugh Knott: Antennaria carpatica (Carpathian Catsfoot)
Hugh Knott: Antennaria dioica (Mountain Everlasting)
Hugh Knott: Antennaria dioica (Mountain Everlasting)
Hugh Knott: Antennaria dioica (Mountain Everlasting)
Hugh Knott: Antennaria dioica (Mountain Everlasting)
Hugh Knott: Antennaria dioica (Mountain Everlasting)
Hugh Knott: Antennaria dioica (Mountain Everlasting)
Hugh Knott: Antennaria dioica (Mountain Everlasting)
Hugh Knott: Antennaria dioica (Mountain Everlasting)
Hugh Knott: Arnica montana (Mountain Arnica)
Hugh Knott: Arnica montana (Mountain Arnica)
Hugh Knott: Artemisia absinthium (Wormwood)
Hugh Knott: Artemisia borealis (Arctic Mugwort)