whorled milkweed: milkweed of the eastern United States with narrow leaves in whorls and greenish-white flowers
entity: that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
celluloid: highly flammable substance made from cellulose nitrate and camphor; used in e.g. motion-picture and X-ray film; its use has decreased with the development of nonflammable thermoplastics