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