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. S. nutans 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 ofi^ 

 the partly decaying outer leaves that the younger growth may become 

 more active. 



Sagitiaria pusilla (Nutt.) or Slender or Subulate Arrowhead is similar to 

 S. nutans 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 5^ to ^ inches across, with broad filaments. Grows from 

 New York to Alabama along the coast line and may be had of dealers. 



Sugitturiu sagitttefolia (Linn.), (var. S. floreplenu,) or Long-beaked 

 Arrowhead is a 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. sagitt tefolia develops the sagittate leaves above 

 the water in the flowering season and grows in swamps and streams in New 

 Jersey and Pennsylvania to Alabama. S. sinensis is native south of the 

 Carolinas on the Atlantic slope, and is also propagated in tanks and aquaria. 

 S. mulerttii is probably a hybrid of S. nutuns and S. sinensis. These 

 Sagittarias are generally to be had of dealers. 



Sugitturiu grumina (Michx.) or Grass-leaved Arrowhead is an erect 

 glabrous and simple-leaved plant rarely over i 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. 



Sugittariu lutifolia {S. vuriubilis,) (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. 



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