Family Key 7 
GROUP 2—Monocotyledons with wide leaves 
A. Plant with a skunk-like odor; leaves 3-10 dm. long, oval; flowers forming a 
fleshy cone (spadix) 5—15 cm. long surrounded by a bright-yellow leaf (spathe). 
ARACEAE (p. 89) 
AA. Plant without skunk-like odor; leaves either not oval or smaller; inflorescence not 
as above. 
B. Leaves more than 2, all basal, ovate or oval to triangular-sagittate; petioles rather 
long; growing in mud or water along ponds. ALISMACEAE (p. 35) 
BB. Leaves not as above in all points. 
C. Plant submerged altho sometimes with floating leaves; flowers in spikes, incon- 
spicuous. Potamogeton in NAIADACEAE (p. 31) 
CC. Plant not submerged altho occasionally growing in wet places; flowers some- 
times in spikes, mostly conspicuous. 
D._ Perianth regular; ovary superior except in IRIDACEAE. 
E. Flowers enveloped by chaffy bracts and without other perianth; bracts of 
the perianth green or brown, less than | cm. long; plants rush-like or grass- 
like. JUNCACEAE (p. 90) 
EE. Flowers with white or colored corolla or perianth; perianth not chaffy, 
mostly more than | cm. long; plants mostly not rush-like but often grass- 
like. 
F. Ovary superior; leaves mostly not equitant; either stamens 4 or 6, or 
else 3 and also 3 staminodia. 
G. Herbs, without tendrils. 
See MELANTHACEAE, LILIACEAE and CONVALLARIACEAE (p. 94) 
GG. Climbing shrubs, with stipular tendrils. SmiLacEAE (p. 110) 
FF. Ovary inferior; leaves equitant; stamens 3; staminodia none. 
IRIDACEAE (p. 110) 
DD. Perianth irregular; ovary inferior. ORCHIDACEAE (p. 112) 
KEY TO THE DICOTYLEDONS 
A. Trees or shrubs (including woody vines). 
B. Leaves opposite. Group 3 (p. 9) 
BB. Leaves alternate. 
Go Trees. Group 4 (p. 10) 
CC. Shrubs. 
D. Leaves compound. GrouP 5 (p. 11) 
DD. Leaves simple. 
E. Branches with spines or prickles; leaves not evergreen. GROUP 6 (p. I1) 
; EE. Branches without spines or prickles. . 
: F. Leaves evergreen. Group 7 (p. 12) 
3 FF. Leaves deciduous. Group 8 (p. 13) 
AA. — Herbs. 
G. Stems 12 mm. or more thick, very fleshy; leaves represented by conspicuous spines. 
CACTACEAE (p. 258) 
GG. Stems either not so thick or else not fleshy; leaves not mere spines in case the 
stem is fleshy. 
H. Leaves opposite or whorled. 
I. Leaves compound. Group 9 (p. 14) 
IJ. Leaves simple. 
J. Plant prostrate, matted, very prickly; leaves awl-shaped, 6—10 mm. 
long, prickle-pointed, very dense; on sand near the seashore. 
ILLECEBRACEAE (p. 160) 
7 
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