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