isatis tinctoria, also called woaddyer's woad, dyer's-weed,

39aph39 agriculture anthodium blooming blooms blue brassicaceae brightyellow bud bush butterfly cabbage called charlock cruciferae documented dye dyer entomophily environment family field flower flowering fly galium glastum grass green history honey insect isatis jointed leaf meadow medicine mustard nature oilseed petal pistil plant pollination radish rape rapeseed raphanistrum raphanus sweed spring stamen stem summer super tinctoria use verum village weeds wild woad woaddyer yellow