european birthwort, leaves and flowers

acid aristolochia aristolochiaceae aristolochic birthwort bloom blooming blossom botanical botany clematitis close daylight environment erect europe european flexuous flora floral flowers green growing grows growth hearth herb herbaceous italy leaf leaves meadow morning natural nature outdoor pale peduncle perennial poisonous season seasonal shadow shaped stem summer terni tubular umbria uncultivated vegetable vegetation wild yellow