yellow-brown oneflower close-up against the background of green foliage and small inflorescences

flower plant blooming blossom botanical floral leaf nature petal spring coneflower botany echinacea flora illustration isolated wildflower bloom bud design drawing natural stem summer vintage herb sketch elegance homeopathy purple foliage canada cultivation freshness branch rudbeckia houseplant closed beautiful gardening retro field ornamental leaves greenery