| Clue | Source | Date |
|---|---|---|
| Groups of plants | New York Times | 17 Apr 2024 |
| Faunas' counterparts | USA Today | 15 Apr 2022 |
| Groups of plants | Universal | 02 Mar 2021 |
| Counterparts of faunas | New York Times | 07 Feb 2021 |
| Regional plant groups | The Washington Post | 18 May 2016 |
| Faunas' kin | Universal | 18 Feb 2016 |
| Faunas' kin | ||
| Groups of indigenous plants | ||
| Groups of plants | ||
| Regional plant groups | ||
| Regional plant groups | ||
| Plants of regions | ||
| Plant groupings | ||
| Groups of indigenous plants | ||
| Treatises on plants. |