| Noun | 1. | Nyctaginia - a caryophyllaceous genus of the family Nyctaginaceae having only one species caryophylloid dicot genus - genus of relatively early dicotyledonous plants including mostly flowers Allioniaceae, family Allioniaceae, family Nyctaginaceae, four-o'clock family, Nyctaginaceae - a family of flowering plants of the order Caryophyllales Nyctaginia capitata, scarlet musk flower - viscid branched perennial of the southwestern United States and northern Mexico having tuberous roots and deep red flowers |