little white flowers green background in spring field, cardamine flexuosa, chongqing, china

grass green meadow plant lawn flower nature leaf sunlight grassland field moisture water dew prairie wildflower small flowering growing height perennial short erect stems leaves pinnate base pairs rounded leaflets flowers white stamens fruits flexuosa generally overtop feature distinguishing cardamine hirsuta commonly wavy bittercress wood bitter-cress herbaceous annual biennial short-lived cabbage family brassicaceae little spring chongqing china background