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| 155. | Adjacent edges of leaf-scars meeting and prolonged upward into a conspicuous tooth. | 156 |
| 155. | Adjacent edges not meeting, therefore not forming a tooth. | 158 |
| 156. | Buds white-downy, collateral buds generally present, twigs generally with a bloom; leaves pinnately compound. | Acer
negundo, Boxelder |
| 156. | Buds smooth, collateral buds never present, twigs without bloom; leaves simple. | 157 |
| 157. | Buds with only one pair of scales visible, older branchlets white-streaked. | Acer
pensylvanicum, Striped Maple |
| 157. | Buds with several pairs of scales visible, branchlets not white-streaked. | Acer
platanoides, Norway Maple |
| 158. | Outer single pair of bud-scales equaling the bud in length, their edges meeting and enclosing the bud (therefore generally only one pair of scales visible); pith brown; shrubs or at the most small trees. | 159 |
| 158. | Outer pair of scales shorter than bud, their edges not meeting (therefore several pairs of scales visible); trees. | 160 |
| 159. | Buds and twigs stout, smooth; young bark with longitudinal white lines. | Acer
pensylvanicum, Striped Maple |
| 159. | Buds and twigs more slender, both buds and twigs white-downy; white lines absent from bark. | Acer
spicatum, Mountain Maple |
| 160. | Buds brown, narrow, sharp-pointed, generally 4 to 8 pairs of closely over-lapping scales visible; collateral buds absent. | |
| 160. | Buds red or green, broader, blunt-pointed, fewer scales visible. | |
| 161. | Terminal buds small, red, generally under 5 mm. long and not distinctly larger than lateral buds; collateral buds generally present; pith pink; native trees. | 162 |
| 161. | Terminal buds large, stout, generally over 5 mm. long and generally distinctly larger than lateral buds; collateral buds never present; European trees. | 163 |
| 162. | Broken twigs with rank odor; bark falling away in large, thin flakes on old trees. | Acer
saccharinum, Silver Maple |
| 162. | Broken twigs without rank odor; bark rough on old trees but generally not flaking in large thin scales. | Acer
rubrum, Red Maple |
| 163. | Buds red, inner scales covered with rusty wool; adjacent edges of leaf-scars meeting and forming a slight projection; bark close-ridged (not flaky). | Acer
platanoides, Norway Maple |
| 163. | Buds green, inner scales white-woolly, edges of leaf-scars not meeting; bark flaking off squarish scales. | Acer
pseudoplatanus, Sycamore Maple |