| Clue | Source | Date |
|---|---|---|
| Its leaves were once used in leather making | Newsday | 15 Aug 2020 |
| Evergreen with leathery leaves | Wall Street Journal | 16 Nov 2019 |
| Pacific Coast evergreen | Thomas Joseph | 17 Nov 2018 |
| West Coast evergreen | ||
| Acorn-producing California evergreen | ||
| Pacific Coast evergreen | ||
| Pacific evergreen |