1. Quercus velutina   pine   oak   hibiscus   walnut   Hint Half-n-half Clue   2. Platanus occidentalis   oak   sycamore   maple   walnut   Half-n-half Clue   3. Acer rubrum   sycamore   hickory   maple   pine   Half-n-half Clue   4. Pinus aristata   hibiscus   ash   pine   cedar   Half-n-half Clue   5. Picea pungens   maple   oak   spruce   hibiscus   Half-n-half Clue   6. Juglans nigra   hickory   spruce   hibiscus   walnut   Half-n-half Clue   7. Juniperus virginiana   spruce   cedar   hibiscus   maple   Half-n-half Clue