De P. Robbinsii Oales, 
branche 
broad, mi 
a 
pv Cris 
ds; leaves all submerged, linear 
nutely serrulate.on the margi 
sl 
slender, 
v0-30 ci, lone or more, lictle 
ys acute, o-l2 em, long, 5-5 mm, 
inuhovalinonent 
ns, the stinvles white and membranous, 
the 
thick 
shoathing; veduncles 3-6 om, lonr, ender, about as as stems 3 
spikes 1l-1.5 cm. long, not dense; nutlets 3-kecled, 3.5-4 mm, lone 
On inuddy bottoms, Upver Priest Lake, adling 7741, 
1045 Py gost 
ormis }' 
a oe 
erit 
leeves sll 
abruptly 
submerged, 
aed 4 1, 
nerrowed at the 
streets 
line: 
1a 
tle 
ry 10-20 em, 
actened end somevhet winged, branching; 
long, wide, gresslike, even 
a & 3 3 
rith 
7 
av 
usually 
£ a 
ad © 
Cirle 
long, dake: 
vrincipal vei 
lon: 
ae 
>) 
4 
Sl-aec 
3 Je re Fe 
led. 
ns 3 
cylindrical , 
(Pe compre 
ex vo 2 short nucro, Clasping at the base, 
stlivules oblong, obtuse, deciduous; 
1-° 
ssus Am, au 
oF 
Vu 
ate) 
tran TLS 
UDNES 
ems very slender, 
Que 3 
peduncles 
nutlcts smooth, 35,5=4 mm, 
Ete 
Leke Pend Oreille, 
branched, 50-50 om. long; lerves 
CMe lone, .5-1,5 mm, wide, mostly t-veined, flat, bearing two 
sluccnt slands at the base of the blade: stipules 6-8 mn, long, 
eee 
cdeciducus; 
lender, commonly S-6 en, long, 
the inflorescenes an intcrruvted spike 1-3 om, ions; nutlets 1.5=2 mm, lone 
-~Srooved on the back, not kcoeled, 
“recuent in shallow pools or marshes or lelce mercinse ie panormitanus 
Con 
Biv. may be 
membranous, 
separated with difficulty 
sresnisn stivules, 
llus, by its delicately ve 
eee ee 
Susi i] 
iets 
, 
ined, 
