

157 
Leaves simple, ete,—Continued. 
Smooth; bark without milky juice: 
Fruit fleshy, or at least berry-like: 
1-seeded (a stone), globular: CHernies: 
With mostly rounded teetb on the margin of leaf 
With sharp teeth on the margin of the leaf: 
Dull green on upper surface of leaf; commonly 
downy below; teeth straight................ 
Shiny green on upper surface; not downy below; 
teeth more or less incurved: 
Pale on the under surface : 
Margin often with teeth of two sizes. .......... 
Margin with teeth of only one size............. 
3-sceded, pear-shaped : BUCKTHORNS: 
Margin of leaf wavy, sometimes with very small teeth, 
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Margin of leaf always toothed and somewhat downy 
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Fruit not fleshy nor berry-like—a catkin with persistent 
woody scales: ALDERS: 
Baseof the leaf wedge-shaped .... 02.06. 22sec enes ene 
Base of the leaf rounded or heart-shaped. .............. 
b. With coarse (not bristle or prickle pointed) teeth: 
Leaves equal-sided; teeth of one size or of two sizes and glandular- 
pointed: 
Broadly triangle-shaped, not glandular-toothed ; bark bitter: 
POPLARS: 
Ween Hairy,’ close, and much incut'ved,............---- ses. 
Teeth not hairy, rather distant, and but slightly incurved.. -. 
Ovateor lance-shaped, glandular-toothed; bark not bitter: ALDER 
Leaves unequal-sided; teeth of two sizes, but not glandular- 
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c. With deeply-cut blunt or painted lobes, distant-undulate, prickle or 
bristle pointed teeth: 
Circular in outline, with 3 to 7 (mostly 5) deep, sharp-pointed 
lobes; fruit a ‘‘ ball”: SYCAMORE ......--..- 
Ovate, etc., in outline; fruit an acorn: Oaks: 
Leaves very large, 4 to 10 inches in length, with 3 to 6 pairs of 
‘ateterred elhaben nal at 0%: few ae a Ree ee ara eee See Se 
Leaves smaller, mostly less than 3 inches long: 
With bristle-pointed, deeply-cut teeth (eccasionally with 3 to 
5 somewhat equal biunt lobes) ............-.- 
With prickle-pointed shallow teeth (sometimes with wavy, but 
not lobed margin): 
Halberd-shaped ; mature leaves usually glossy green on both 
BLOM a Ma a POs oo abe ama espe 
SEALS OF a Die eS SR ee oe era a oes. 
B.— Leaves set opposite? on the branches: 
Margin deeply cut with 3-pointed lobes; fruit (seed) a 2-winged key®: 
MAPLES: 
Lobes mostly entire, or only occasionally with coarse teeth....-.---.---- 
Lobes always with rather fine sharp teeth .......-.--....--. ---0-. ---0- 
Margin entire, or only slightly indented with shallow, rounded teeth; fruit 
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