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