maiden blue-eyed mary: small widely branching western plant with tiny blue-and-white flowers; British Columbia to Ontario and south to California and Colorado
wildflower: wild or uncultivated flowering plant
heliopause: the boundary marking the edge of the sun's influence; the boundary (roughly 100 AU from the sun) between the interplanetary medium and the interstellar medium; where the solar wind from the sun and the radiation from other stars meet