sword-leaf dogbane trachomitum venetum, pinkish-blue flowering plant

plant flower herb wildflower shrub produce meadow lilac garden blossom lavender prairie evergreen food tree grass lawn vegetable spear-leaved dogbane apocynum venetum family apocynaceae high resolution botanical inflorescence flora rarity cultivar variety hybrid endemic natural habitat sword-leaf trachomitum pinkish-blue flowering