28 ELODEACEAE 
pee spiral; spathe loose, 2-2.5 em. long: hypanthium 2.5-3 cm. long in 
anthesis: petals less eR 15a as long as the ape capsule po 7-11 in 
Mir Mae d oe Coastal Plain, Fla. to La.—Al ye ps plan 
mueh (legen in pe than the precedi ng. "Ofte very m ant in 
growth. Like be preceding. eres it is a favorite food of ducks, and Ea 
of other water bir 
3. PHILOTRIA Raf. Fresh-water herbs. Leaves eauline, opposite or 
whorled. Flowers perfect and with 3 stamens or dioecious or polygamous; the 
staminate with 9 stamens detach themselves, arise and float on the surface of 
the water and shed their pollen about the pistillate or perfect flowers or reach 
the surface by the elongation of their thread-like hypanthia like the pistillate 
flowers whieh are raised to the surface on long stalks; the pistillate similar 
and slender-pedicelled. Fruit enclosed by the BR. [Elodea Michz.]— 
About 10 species, natives of America; one naturalized in Europe.—Spr.-sum. 
—WATERWEEDS.—The plants of some species are collected locally and applied 
to eultivated land as fertilizers. 
Staminate spathes not cleft d to the base, 1-flowered : 
petals less than 5 mm. long or wanting: upper 
Leaf- leaves 1-5 mm. ree : staminate flowers with the 
3 central stamens on a stalk exceeding the other 6: 
pistillate flowers frequent, m cr erted. 1. P. canadensis. 
Leaf- T less than 1 mm. bro staminate flowers 
ith 9 equal stamens: AE flowers unknown. 2. P. linearis. 
Staminate spathes cleft nearly to the base, several-flowered : 
petals about 1 em. long; upper leaves in whorls 
of 4. 3. P. densa. 
1. P. canadensis Dec Britton. Stem slender, dichotomously branched 
lower leaves opposite, with small ovate blades; upper leaves of pistillate du 
with elliptie to Iuiccón x ovate blades, firm 
een, imbrieate above; those of stami- 
nate plants narrower, even lanceolate-linear, 
es scarcely imbricate: staminate spathe 
thers 3 m ong: pistillate spathe nearly 
pid. [i EA UN pistillate flower long 
stigmas 3, ligulate, pink, Mi cleft. [P. Nut- 
ji E. U. 8.)]— 
o Calif., Wash., and Que —A r ae ae 
Rm P. ea ea. has been reported from Florida in error. 
2. P. linearis Rydb. Stem slender: upper leaves with EA uc Dowd 
green blades, 5-12 mm. long, not imbrieate: staminate spathe n P. 
densis ; a flower exserted on a thread-like oa o a 
pend mm. long: petals white, linear, exceeding the sepals or abortive; or. 
lon ig wam ps, Interior Low Plateaus, Bios Cumberland River, near 
Nashville, Ten 
3. P. densa naa Small. Stem stout, 2-3 mm. in diameter: leaves very 
numerous, nd crowded; blades lanceolate to linear-lanceolate, 1.5 
long, 2-5 mm. broad, acuminate, serrulaté: spathe of the staminate flowers 
1 Prepared with the assistance of Harold St. John. 
