Family Key 21 
LL. Plant without stellate hairs, often with simple ones; in either dry 
or moist regions. 
M. Leaves with sheathing stipules. POLYGONACEAE (p. 130) 
MM. Leaves without stipules. 
N.  Ejther the akene 3-angled in cross section, or else the calyx 
of 6 segments. POLYGONACEAE (p. 130) 
NN. Akene or utricle not 3-angled in cross section; calyx never 
of more than 5 segments. 
O. Leaves entire, 3-veined from the base, lanceolate or ovate; 
stamens 4; style | or none. 
Parietaria in URTICACEAE (p. 127) 
OO. Leaves with not all 3 of the above characters; stamens 
sometimes 4; style sometimes |. 
P. Leaves entire; flowers bracted; bracts and sepals sca- 
rious. - AMARANTHACEAE (p.. 145) 
PP. Leaves entire or not; either the flowers bractless or the 
bracts not scarious; sepals green or greenish. 
CHENOPODIACEAE (p. 140) 
AA. Ovary and fruit inferior. 
Q. Leaves pinnately veined or only 1|-veined, entire or very nearly so. 
R. Leaves linear-setaceous. Howellia in LOBELIACEAE (p. 370) 
RR. Leaves wider. 
S. Stem terete; flowers in cymes; fruit fleshy, drupaceous. 
SANTALACEAE (p. 128) 
SS. Stem 5-angled; flowers solitary in the leaf axils; fruit dry, a capsule. 
Lythrum in LYTHRACEAE (p. 259) 
QQ. Leaves palmately veined, entire or not. 
T. Leaves 4—13 mm. long, cuneate at base, deeply 3-lobed, the lobes 2—4- 
cleft; stipules large, 2—5-cleft; stem 2—20 cm. long. 
Alchemilla in ROSACEAE (p. 206) 
TT. Leaves longer, either not cuneate at base or not deeply lobed; stipules entire 
or none; stem often longer. 
U. Leaves mostly in a basal tuft; stipules present; flowers in spikes or panicles; 
calyx-lobes less than | cm. long; stamens 5; ovary 1—2-celled; stem with- 
out ginger taste. Heuchera in SAXIFRAGACEAE (p. 195) 
UU. Leaves from an elongated creeping stem; stipules none; flowers solitary 
in the leaf axils; calyx-lobes 2—6 cm. long; stamens 12; ovary 5-celled; 
stem with ginger taste. ARISTOLOCHIACEAE (p. 130) 
GROUP 17—Dicotyledonous herbs with alternate simple leaves and polypetalous 
flowers with numerous stamens 
A. Leaves tubular or pitcher-shaped, 2—6 dm. long. SARRACENIACEAE (p. 192) 
AA. Leaves not tubular nor pitcher-shaped, mostly less than 2 dm. long. 
B. Leaves either peltate or else rounded or ovate, 10 cm. or more wide, entire, mostly 
floating. NYMPHAEACEAE (p. 161) 
BB. Leaves not peltate, often not rounded or ovate, never so wide and alsy entire, 
mostly not floating. 
C. Leaves entire. 
D. Pistils more than I. 
E. Flowers solitary or scattered; petals with a pit on the inside; calyx of 5—6 
distinct sepals; stamens on the receptacle. . RANUNCULACEAE (p. 162) 
