Araceae 89 
GG. Perigynia less than 4 mm. long. 
J. Perigynia horizontal or reflexed, ovate, 3—4 mm. long. 
K. Spikes 5—12-flowered. 
Inflorescence |—3 cm. long; spikes 2—6, somewhat near. W. C. E. 
(C. sterilis for our region.) 
C. stellulata Good. 
LL. Inflorescence 2—6 cm. long; spikes 2—4, very remote. C., 
C. stellulata ormantha Fer. 
KK. Spikes 12—20-flowered. W. 
C. stellulata excelsior Fer. 
JJ. Perigynia ascending to erect, elliptic to ovoid-oblong, 2—3 mm. long. 
M. Plant glaucous; leaves 24 mm. wide; perigynia’ many, glaucous, ob- 
scurely beaked. W.C. (C. canescens subloliacea. ) 
C. canescens L. 
MM. Plant not glaucous; leaves |—2.5 mm. wide; perigynia few, not glau- 
cous, distinctly beaked. C. 
C. brunescens Poir. 
/ ARACEAE Arum Family 
Herbs, large, perennial, with acrid or pungent juice. Leaves large, all basal 
(ours) or alternate, simple (ours) or compound, often quite netted-veined. Flowers 
crowded on a spadix which is usually surrounded by a conspicuous spathe (ours). 
Perianth none, or of 4—6 sepals (ours). Stamens 4 (ours). Ovary |- to several- 
celled; ovules | to several in each cell; Style short or none; stigma terminal, mostly 
minute and sessile. Fruit usually berry-like. Seed various, mostly minute. 
LYSICHITON SKUNK CABBAGE 
Plant with strong skunk-like smell; rootstock very thick, horizontal. Leaves flat, 
netted but the large veins from the base, 3—12 dm. long, 7-45 cm. wide. Spathe 
yellow; spadix 5—10 cm. long, 2—-3.5 cm. wide. Flowers numerous. Petals 
none. Sepals 4. Stamens opposite the sepals; filaments short, flat. Ovary conical, 
2-celled, 2-ovuled; stigmas depressed. (Gk. lysis—=a loosening, chiton—a mantle; 
referring to the yellow spathe.) W. C. E. 
L. camtschatcense Scott (Skunk Cabbage) 
LEMNACEAE Duck-weed Family 
Minute, stemless, floating, merely | or more flattened (ours) or spherical multi- 
cellular green bodies with (ours) or without roots hanging from the under side. Flow- 
ers monoicous, | or more from the edge, rarely present. Fruit a utricle. Seeds 1—~7, 
large. 
A.  Thalloid shoots 1—5-veined, with O—1 rootlet. LEMNA (p. 89) 
AA. Thalloid shoots 7—15-veined, with several rootlets. SPIRODELIA (p. 90) 
LEMNA — DUCK-WEED 
Thalloid shoots with numerous acicular raphides; new shoots coming from a 
lateral slit; roots without vascular tissue. Flowers from lateral slits, usually. 3 together, 
surrounded by a spathe, 2 staminate, | pistillate. Anther-cells transverse. Seeds |—6. 
Floating on fresh-water ponds or lakes. (Gk. limne—swamp; referring to the habitat. ) 
A. Thalloid shoots long-stalked at base, oblong, 6—10 mm. long, remaining con- 
nected. W. E. L. trisulca L. (Fairy Paddle) 
