
AQUATIC PLANTS OF FRESHWATER 

exhibit clearly veined and distinctly outlined cellular structure, grow 
to and float immediately below or on the surface of the water, and 
in midsummer develop lanceolate emersed and floating floral leaves 
resembling those of other species of the Arrowheads. The small, incon- 
spicious white flowers have three petals with yellow centres and are devel- 
oped in 2 to 4 whorls about a long floating scape. These extend above 
the surface until the flowers are fertilized, but the fruit ripens on or below 
the surface of the water. 9S. mafans is an exotic which may be obtained 
from dealers and is in such constant demand that its extensive propagation 
would be a profitable industry. In replanting it is advisable to take off 
the partly decaying outer leaves that the younger growth may become 
_more active. 
Sagittaria pusilla ( Nutt.) or Slender or Subulate Arrowhead is similar to 
S. natans but a more slender-leaved plant, sometimes but a few inches high, 
with narrow linear submerged and lanceolate floating leaves, and the flowers 
in one whorl 1% to 34 inches across, with broad filaments. Grows from 
New York to Alabama along the coast line and may be had of dealers. 
Sagittaria sagittefolia (Linn.), (var. 8. floreplena,) or Long-beaked 
Arrowhead isa slender species with double flowers. This is a very varia- 
ble form and many species have been referred to it, among them S. 
sinensis (Sims.) and S. gigantea (Hort.), the cultivated broad-leaved or 
giant aquarium sagittaria, and also the semi-aquatic Arrowhead, known to 
florists as S. chinensis. S. sagittafolia develops the sagittate leaves above 
the water in the flowering season and grows in swamps and streams in New 
Jersey and Pennsylvania to Alabama. 8S. simensis is native south of the 
Carolinas on the Atlantic slope, and is also propagated in tanks and aquaria. 
S. mulerttii 1s probably a hybrid of S. watans and S. sinensis. These 
Sagittarias are generally to be had of dealers. 
Sagittaria gramine (Michx.) or Grass-leaved Arrowhead is an erect 
glabrous and simple-leaved plant rarely over 2 feet high, with flat broadly- 
linear or lance-elliptical and pointed leaves which are purplish in the Spring. 
The small flowers are white and in 2 or 3 whorls. Grows in shallow water 
from Newfoundland to Ontario and South Dakota, and south to Florida 
and ‘Texas. 
Sagittaria latifolia (S. variabilis,) (Willd.) or Common American 
Arrowhead is variable in stature and shape of leaves,and may be only a few 
inches or 3 feet in height. The leaves are mostly sagittate with long basal 
lobes, but run to very narrow forms. ‘The flowers are clear white with 
slender filaments. Common everywhere in ponds and lakes and may be 
had of dealers. Will thrive in the aquarium. 
185 
