BETULACEAE 417 
em. jong, t rt bracts broadly oval or nearly 
8 each bractlet of the pistil- 
Tate mene a cui foliaceous and lobed. 
CAN-HAZELNUT.)—Low thi ckets 
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ous provinces, Ga. to Kan 
2. cornuta Marsh. Shrub 1-2 . tall: 
er blades bow oblong or oral. vary- 
ing to obov e, 4-12 em. long, eo arsely ser- 
rate and p^ arply serrulate: staminate 
aments 2-5 em. long, the bracts rhomboid- 
obovate, apiculate: each bractlet of the 
pistillate aments 
tubular involu 
(BEAKED- HAZELNUT.) — Stony, often acid 
soil along streams and in thickets, and in open woods, Piedmont süd more 
northern provinces, Ga. to Kans., Sask., Que., and N. S. 
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FaAwinLy 2. BETULACEAE — BmcnH FauiLY 
Shrubs or trees, the wood close-grained. Leaves deciduous: blades 
with 2-several series of teeth. Staminate aments drooping, wi 
bract subtending 2 or 3 flowers, the calyx present.  Pistillate aments 
seldom drooping, the bracts thickened and woody, each one bearing 2 or 
3 pistils, the calyx wanting. Fruit a cone-like aggregate of the accrescent 
bracts, each of which subtends a nut.—Two genera and about 45 species, 
most abundant in the Northern Hemisphere. 
C 
-x 
S marr pone mae of the mature pistillate aments membranous, 3-lobed, Bay 
with t 
Stamens 4 (36) : bracts of the mature pistillate aments thickened and 
woody, persistent. 2. ALNUS. 
1. BETULA [Tourn.] L. Shrubs or trees, the bark often aromatic. 
Staminate flowers with 2 stamens, the anther-sacs separated. Bracts of the 
pistillate aments 3-lobed, thin and appressed or ascending at maturity.— 
About 35 species, natives of the north temperate and arctic zones.—The wood 
is valuable for cabinet work and for small articles used in various manu- 
factories. The bark, which is impervious to water, is used for canoes, boxes, 
and shoes. It peels naturally in horizontal strips.—Spr.—BIRCHES. 
Fruiting ament peduncled: samara wider than long. I. NIGRAE. 
Fruiting ament sessile at the end of a short branch: samara longer 
than wide. II. LENTAE. 
I. NIGRAE 
Fruiting aments ellipsoid, erect; scales tomentose: leaf-blades broadly cuneate at 
the base. 1. B. nigra. 
Fruiting aments narrowly cylindric, nodding; scales not 
tomentose: leaf-blades cordate at the base. 2. B. cordifolia. 
II. LEN 
Leaf-blades shining above: mature De seine with two 
short broad ead tat lateral lobes: a with triangu- 
lar-obovate or cuneate wings: bark BW 3. B. lenta. 
Leaf-blades dull above: mature BE bracts with two 
E lateral lobes: sam with orbicular-obovate 
ngs: bark yellowish or silve a 4. B. allegheniensis. 
27 
