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