16 Family Key 
F. Sepals 5; leaves entire or nearly so, ovate or narrower; styles or sessile 
stigmas 2—5. CARYOPHYLLACEAE (p. 152) 
FF. Sepals 4; leaves crenate to pinnatifid, often reniform to orbicular; 
styles and stigmas |—2. 
G. Stamens 2 or 4; style 1; leavés not wedge-shaped at base. 
_. Synthyris in SCROPHULARIACEAE (p. 341) 
GG. Stamens 8; styles 2; leaves wedge-shaped at base. 
Chrysosplenium in SAXIFRAGACEAE (p. 195) 
EES Seed: 4. 
H. Lower leaves 2-lobed, the upper entire; stem weak and slender; styles 
and stigmas 3. Pterostegia in POLYGONACEAE (p. 130) 
HH. None of the leaves 2-lobed; stem stiff or fleshy; styles or stigmas 2. 
CHENOPODIACEAE (p. 140) 
AA. Petals present. 
I. Sepals 2; plants without milk juice. PORTULACACEAE (p. 148) 
II. Sepals or calyx segments more than 2, or else plant with milky juice. 
J. Leaves very fleshy, thick. 
K. Stipules none; leaves terete or flattish; carpels distinct at least above thus 
making the ovary 3—5-lobed. CRASSULACEAE (p. 193) 
KK. Stipules scarious; leaves terete; carpels united to the tip and thus the ovary 
not lobed. Tissa in CARYOPHYLLACEAE (p. 152) 
JJ. Leaves not fleshy, thin or coriaceous. 
Leaves entire. 
M. Leaves obovate, scattered along an elongated prostrate or floating stem; 
sepals and stamens 2—4. Elatine in ELATINACEAE (p. 254) 
MM. Leaves not obovate; stems often not as above; sepals and stamens 
usually more numerous. 
N. Leaves all basal; ovary |-celled; placentae 3—4, parietal; sepals 
and petals and stamens 5 each. Parnassia in SAXIFRAGACEAE (p. 195) 
NN. Leaves not all basal; ovary 1—18-celled; placentae axial or parie- 
tal; sepals and petals and stamens not always 5 each. 
O. Sepals 2—3; ovary. 3—18-celled; placentae parietal. 
PAPAVERACEAE (p. 173) 
OO. Sepals 4—6; ovary 1—10-celled; placentae axial. 
P. Leaves punctate with immersed pellucid resinous glands, often 
with small black spots; petals yellow, often black-spotted; stamens 
in 3 sets in all but | species. HyPERICACEAE (p. 254) 
PP. Leaves not punctate, not black-spotted; petals not yellow 
(except in | species of Linum), not black-spotted; stamens not in 
sets. 
Q. Stem 4-angled. LYTHRACEAE (p. 259) 
QQ. Stem terete. 
R. Leaves all opposite; ovary and capsule 1-celled; seed not 
oily. CARYOPHYLLACEAE (p. 152) 
RR. Some of the leaves alternate; ovary and capsule 2—10- 
celled; seed oily. LINACEAE (p. 244) 
LL. Leaves not entire. 
S. Leaves evergreen, coriaceous, ovate to orbicular; flower 1, on a scape 
at the summit of the simple stem. | Moneses in PYROLACEAE (p. 291) 
SS. Leaves deciduous, herbaceous, narrowed; flowers mostly more than |; 
stem usually branched. 
T. Stipules present; plant glandular-pubescent; leaves oblanceolate. 
Bergia in ELATINACEAE (p. 254) 
