Ww tI. P., natans (Michxe ) Ae ttaton, Stem prostrate, commonly 30-120 em, long, 
brenching, rooting at the nodes; lesves oblong or narrowly elliptical, 
8-15 cm, long, obtuse or subacute at both ends, both surfaces glabrous in 
© & 
seca ence ailiiele Ria: ciniinnianiiiiiiasilemy: a 
floating forms, hairy in terrestrial forms or in terrestrial portions of 
partly submerged plants, vetioles variable, commonly .5-1.5 om, long; 
ocreae cylindrical, .o-1.5 long, obliquely truncate; flowers rose-colored 
in a dense terminal spike commonly 2 cm. long, 1-1.5 cm, in diameter; 
bracts ovate, 5 ma, long, glabrous, not ciliate, perianth 4 m, long, 
S-cleft to below the midale, segments oblong, obtuse; stamens D9, subecual 
to the segments, the style 2-cleft, exserted; achene lenticular, 2.5 mm. 
long. 
Rooting in mud or rloating on still water. Lake Coeur d'Alene; Weippes 
Coolin; Upver Priest Lake; Priest Lake; East River; Granite Sta, 
U 12. P. coccineum !uhl, Stems more or less orostrate, 30-60 cm, long, 
eo 
rooting at the nodes, unbranched, the upper part erect; leaves lanceolate, 
or ovate-lanceolate, 1lu-20 cm. long, acuminate, rounded at the base, 
occasionally truncate or subcordate, glabrous or ith an appressed rether 
silky pubescence; petioles 2-4 cm. long; ocreae cylindrical, 2-3 om. long, 
Na thynkr 
closely clasping and molded to the swollen joint, truncate; terminal 
, : A 
? 
narrow, linear kc cKe solitary or with a secondary smaller raceme from 
~ 
the same brect, 6-3 cm. long, 5-6 mm, broad; bracts oval or ovate 3-4 mm, 
long, strongly ciliate, flovers rose-colored, 4 mm, long, 5=<cleft to slightly 
below the middle, lanceolate, obtuse; stamens 5; style 2-cleft, both slightly 
exserted; achene 6 mm. long, subrotund in outline. (P. Muhlenbergii Wats,.). 
Swampy ground of lake embayments below SOOO fte; olants which are more 
. 
or less immersed are glabrate, the lower leaves being mostly cordate or 
qd) trunease at the onse, while terrestrial forms are hirsute with leaves which 
are rounded, but narrowed at she base, or the lower leaves may be clabrous 
and truncate and the unser narrowed and hirs:rte, 
