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