| CORM | Underground part of iris, crocus, etc |
| ROOT | Origins of the underground part of a plant |
| BULBS | Underground parts of plants such as the crocus, dahlia, winter aconite, chionodoxa (glory-of-the-snow) snowdrop and narcissus (5) |
| TUBER | Fleshy underground part of plant (5) |
| BULB | Underground part of some plants (4) |
| ROOTLET | Small underground part of plant |
| TAPROOT | Main underground part of plant |
| RHIZOME | Underground part of plant, one unknown in river refuge (7) |
| BEETROOT | Heard to thrash underground part of plant, vegetable (8) |
| BASEMENT | Underground part of a building (8) |
| ROUTE | Way to get underground part of plant, say (5) |
| PIT | Underground part of a hospital |
| CRYPT | Underground part of church |
| BULBOUS | Shaped like the underground part of e.g. tulip (7) |
| CHICORYROOT | Underground part of Cichorium intybus which, when baked and ground, can be used as a coffee substitute (7,4) |
| ROOTAGE | A developed system of the underground parts of a plant (7) |
| ROOTS | Underground parts of plants |
| CAVERN | The underground parts of vinca vernalis |
| CORMS | What are the underground parts of crocuses and cyclamens? (5) |
| TUBEROUS | Having fleshy, thickened underground parts of a stem or rhizome (8) |
