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