| collinsonia | (n) small genus of perennial erect or spreading aromatic herbs; United States, Syn. genus Collinsonia |
| horse balm | (n) erect perennial strong-scented with serrate pointed leaves and a loose panicle of yellowish flowers; the eastern United States, Syn. stone-root, horseweed, Collinsonia canadensis, richweed, stone root, stoneroot |