vincetoxicum hirundinaria white swallow wort

antidote antitoxin apocynaceae archipelago beautiful beauty blooming botanical botanist botany bright crown cynanchum environment ethnoscience field flower forest fresh freshness garden grass green group herb herbaceous hirundinaria inflorescence june landscape leaf may meadow medicinal medicine midsummer natural nature officinale perennial petals plant solstice summer toxic tranquil uncultivated vincetoxicum water white