abstract biology Capsella Capsella bursa-pasto embryo enlargment family Brassicaceae magification micro microscope mustard plant seed Shepherd's-purse background backlight bloom calyptra capsules ecology environment forest fruit gametophyte germinate germination green lush macro moor moorland moss nature pollen power spores sporophyte stalks twilight wood birch birth blooming branch brown bud catkin Easter foliage germ holiday isolated leaf life New over russian season spring tree twig white young almond almond-flour almond-meal almonds baking blanched-almonds calorie-dense color colors colour colours confectionery cooking drupe flour food gluten-free ground ground-almonds healthy low-carbohydrate meal nut nuts nutty pastry prunus-amygdalus raw sweet-almonds taste tasty uncooked white-embryo blanched cakes chopped cut flaked flakes sliced slivered slivers