ACALYPHA, the THREE-SEEDED MERCURY, a genus of plants belonging to the monococia monadelphia class. The characters of this genus are the following.—Male flowers crowded above the female ones: The calyx is a three or four-leaved-perianthium, the leaflets roundish, concave, and equal: The corolla is wanting: The stamina have from 6 to 18 filaments, which are short, crowded, and connected at the base; the anthers are roundish.—Female flowers fewer, placed beneath, and received into a large divided involucre: The calyx is a perianthium, consisting of three leaflets, which are concave, converging, small, and persistent: No corolla: The pistillum has a roundish germ; the stylus are three, branched, oftener tripartite, and long; the stigmata are simple: The pericarpium has a roundish trifoliate trilocular capsule, the valves gaping two ways: The seeds are solitary, roundish, and large.—This genus ranks in the 38th natural order, Tricocca. There are five species, all natives of Virginia.