KEY TO THE TREES OF NEW ENGLAND.
| I. LEAVES SIMPLE. |
|---|
| Leaves alternate | A |
|---|
| Outline entire | A C |
| Outline slightly indented | A D |
| Outline lobed | A E |
| Lobes entire | A E F |
| Lobes slightly indented | A E G |
| Lobes coarsely toothed | A E H |
| |
| Leaves opposite |
B |
|---|
| A C | Ovate to oval, obscurely toothed |
Tupelo |
| A C | Ovate to oval |
Persimmon |
| A C | Also 3-lobed |
Sassafras |
| A C | Sometimes opposite, clustered at the ends of the branchlets |
Dogwoods |
| A D | Tremulous habit, oval |
Poplars |
| A D | Lanceolate, finely serrate, sometimes entire |
Willows |
| |
| A D | Ovate-oval, serrate, doubly serrate |
Birches
Hornbeams |
| |
| A D | Oval, serrate, oblong-lanceolate, veins terminating in teeth |
Beeches
Chestnut |
| |
| A D | Ovate-oblong, doubly serrate, surface rough |
Elms |
| A D | Ovate to ovate-lanceolate, serrate, surface slightly rough |
Hackberry |
| A D | Outline variable, ovate-oval, sometimes lobed (3-7), serrate-dentate |
Mulberry |
| |
| A D | Ovate, serrate, oblong |
Shadbush
Plums
Cherries |
| |
| A D | Oval or oval-oblong, spines, evergreen |
Holly |
| A D | Broad-ovate, one-sided, serrate |
Linden |
| A D | Obovate, oval, lanceolate, oblong |
Chestnut oaks |
| A D | Broad-ovate to broad-elliptical, thorny |
Thorns |
| A E F | Lobes rounded |
Sassafras |
| A E F | Base truncate or heart-shaped |
Tulip tree |
| A E F | Obtuse, rounded lobes |
White oaks |
| A E F | 3-5-lobed, white-tomentose to glabrous beneath |
White poplar |
| A E G | 5-lobed, finely serrate |
Sweet gum |
| A E G | Irregularly 3-7-lobed, serrate-dentate with equal teeth |
Mulberry |
| A E H | Pointed or bristle-tipped lobes |
Black oaks |
| A E H | Coarse-toothed or pinnate-lobed, short lobes ending in sharp point |
Sycamore |
| B | Outline entire, ovate, veins prominent |
Flowering dogwood |
| B | Outline serrate, apex often tapering |
Sheep berry |
| B | Outline lobed |
Maples |
| II. LEAVES COMPOUND. |
|---|
| | Leaves pinnately compound | I |
|---|
| | Leaflets alternate | I A |
| | Outlines of leaflets entire | I A C |
| | Leaflets opposite | I B |
| |
| | Leaves bi-pinnately compound | J |
| I A | Outlines of leaflets with two or three teeth at base. | Ailanthus |
| |
| I | Outlines of leaflets serrate | Sumacs (except Poison sumac)
Mountain ashes
Walnuts
Hickories |
| |
| I A C | Leaflets oval, apex obtuse | Locusts (except Honey locust) |
| I A C | Leaflets oblong, apex acute | Poison sumac |
| I B | Outlines of leaflets entire | Ashes (except Mountain ashes) |
| I B | Outlines of leaflets serrate | Ashes (except Mountain ashes) |
| I B | Leaflets irregularly or coarsely toothed, 3-lobed or nearly entire | Box elder |
| J | Irregularly bi-pinnate, outlines of leaflets entire, thorns on stem and trunk | Honey locust |
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