ALISMACEAE 25 
11. S. Chapmanii (J. G. Smith) C. Mohr. Leaf-blades linear or lanceolate, 
15-20 em. long, or wanting: scape 3—5 dm. long, with often many flower- -whorls 
and panieulate: fruit-head 5 mm. thick: achene 1 mm. long, wingless, the 
Eug: beak lateral—Ponds and marshes, Coastal Plain, Fla., Ala., and Ga. 
S. fa pd Pursh. pd ie ades narrowly ae MEER E slightly hend 
est abov middle linear, 10-35 cm. long, mainly 3-5 nerved: 
pedicels of i pistillate aod relatively short, their bracts “Of an ovate E 
achene about 2 mm. long.—Low grounds and mars shes, Coastal Plain, Fla. to 
Tex. and Del.—(Mez.) 
. S. lancifolia d Leaf- puse elli id or nearly so to narrowly elliptic- 
lanceolate, 30-60 cm. long, mainly 5—9-nerved: pedicels of rn. flowers 
relatively ‘long, their bra cts of a lanceo lat te type: achene — long.— 
Swamps, pools, and a river- banks, Coastal Plain, Fla. to Te ex— (m. L, Mex., 
A., 8S. A 
C. A., S8. A.)—Very variable in siz es at its best it is the ped - our arrow- 
heads. On en da rida prairie s and m rshes the leaves. and flower-stalks often 
grow higher than one’s head. sed D by is ecu in eases of 
shock Pus EHE bite. 
angustifolia Lindl. Leaf-blades linear or nea arly so, sometimes very 
narrow, 9—4 g: pe as long as eaves or longer, usually simple, 
with several flower ind Ei braets of a lanceolat santas fruit-head 1-1.5 
em. thick: achene 2-2.5 long, abruptly narrowed into the minute beak, 
the dorsal wing usually der) —Low grounds and ion d Plain, Ga. 
to La.—(W. I., Mez., C. A., S. A.) 
aa S macrocarpa J. G. Smith. Leaf-blades linear or linear-lanceolate, 5—7 
long: seape 2—4.5 dm. tall, with 3-5 flower-whorls, ed flowers P A iad lowest 
od or the 2 lower whorls pistillate: fruit-head 10-12 m thick: achene 3 
long, winged, the beak ascending.—Pond-margins and E reer Plain, 
S. C. and N. C. 
S. rigida Pursh. Leaf- Dido rd to broadly ovate, wird i with 
p lobes, 5-20 em. long: scape weak, 1-8 dm. long, with 5-9 flow in. 
"i uit-head 8—15 mm. thick, SCR d ud SO: ‘achene 3-4 mm. lon n inge d, 
e beak aus TIFF-ARR "C ~ and running water, various 
2 inees, Tenn. to Nebr., Minn. Gs Que. ~ N. 
17. S. pubescens Muhl. - blades 8-25 cm. long, with the terminal lobe 
more rounded than in no. 20, puberulent or ‘hirsute: sca 
te flowers ae as lo: 
longer: sepals not accrescent: fruit-head 8-15 mm. thick: achene 2-3 mm. lon ng, 
the beak horizontal or somewhat declined.—Meadows, pois runs, and marshes, 
Coastal Plain and rarely adj. provinces, Fla. to Ala., Tenn., Pa., and N. J. 
8. S. ornithorhyncha Small. Leaf-blades 9-17 em. long, hastate, the terminal 
lobe slightly acuminate, the basal lobes as long as the terminal one or nearly 
n diameter: achene resemblin ng a bird, 4-6 mm. long, the beak as long as the 
acne perd or longer, winged, horizontal- -ascending.—Swamps, Coastal Plain, 
N. C. 
E S. latifolia Willd. Leaf-blades pne 15-40 em. en glabrous, the basal 
dm 
lobes narrower and rather shorter t n the terminal one: scape 3- tall: 
pedieels of pistillate flowers much pns than the acute bracts: fruit-head 
15- ick: achene about 3 mm. long, the beak ascending or recurved 
30 . lo : 
[S. variabilis Engelm.]—(ARROWwLEAF. DUCK-POTATO.  WAPATO.)—Swamps, 
shallow Du er, ry river- -banks, various provinces, Fla. to Calif., B. C., and N. 
B.—(Mez., C. A.) 
