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