| Noun | 1. | foxtail grass - ground pine thickly covered with bristly leaves; widely distributed in barren sandy or peaty moist coastal regions of eastern and southeastern United States Synonyms: Lycopodium alopecuroides |
| 2. | foxtail grass - grasses of the genera Alopecurus and Setaria having dense silky or bristly brushlike flowering spikes Synonyms: foxtail |