allegheny spurge: low semi-evergreen perennial herb having small spikes of white or pinkish flowers; native to southern United States but grown elsewhere
pachysandra: any plant of the genus Pachysandra; low-growing evergreen herbs or subshrubs having dentate leaves and used as ground cover
class cyanobacteria: photosynthetic bacteria found in fresh and salt water, having chlorophyll a and phycobilins; once thought to be algae: blue-green algae