1. Juglans nigra   spruce   walnut   ash   pine   Hint Half-n-half Clue   2. Fraxinus americana   pine   hibiscus   ash   spruce   Half-n-half Clue   3. Betula nigra   birch   ash   cedar   spruce   Half-n-half Clue   4. Quercus velutina   oak   hickory   maple   walnut   Half-n-half Clue   5. Hibiscus lasiocarpus   walnut   hibiscus   ash   spruce   Half-n-half Clue   6. Acer rubrum   cedar   oak   maple   hibiscus   Half-n-half Clue   7. Pinus aristata   spruce   walnut   pine   maple   Half-n-half Clue