1. Betula nigra   pine   birch   walnut   maple   Hint Half-n-half Clue   2. Juglans nigra   hickory   walnut   maple   spruce   Half-n-half Clue   3. Fraxinus americana   hickory   pine   ash   oak   Half-n-half Clue   4. Juniperus virginiana   pine   cedar   walnut   oak   Half-n-half Clue   5. Picea pungens   spruce   walnut   hibiscus   cedar   Half-n-half Clue   6. Hibiscus lasiocarpus   birch   hibiscus   hickory   maple   Half-n-half Clue   7. Carya ordorata   hickory   maple   hibiscus   cedar   Half-n-half Clue