106 ALISMACEAE 
Leaves not generally arrow-shaped. 
Flowers with very short or with no individual flower stems . SS. heterophylla 
Flowers with rather long flower stems. 
Leaves reduced to short rounded stems generally without leaf-blade S. teres 
Leaves more or less grass-like. 
eaves’ lance-shaped)) 7). 9s) tee wees) ee ona) ety Ss eran 
Leaves linear, _ 
Flowers white . a ts. & «) Suesagpilata 
Petals with a rose-colored spot at base : sor et cc? (oti See 
1. §. longirostra, (Micheli.) J. G. Smith. (Fig. 1, pl. 7.) Lone- 
BEAKED ARROW-HEAD. Plant 1 to 3 ft. tall. Leaves on leaf stalks longer 
than themselves, often broad, spreading at base to 2 receding lobes, acute 
at apex and at the ends of the lobes. Flower scape at base 6-angled, 
longer than leaves, very erect; at upper 1/3 about 2 whorls of pistillate 
and 2 to 4 whorls of staminate flowers, each subtended by 3 bracts, 
longer than the flower pedicel. The white petals greater in breadth than 
length. Fruit with a stout beak, nearly erect. This is a common species 
in this country and it is also native in Europe. Its leaves are ex- 
tremely variable in form and hence the species is known also as SN. varia- 
bilis. The drawing, Fig. 1, pl. 7, shows the very narrow form of the 
leaf, the blade is, however, sometimes several inches across. Margins 
of lakes and ponds and in swamps. July-September. 
2. §. arifolia, Nutt. (Fig. 2, pl. 7.) ARUM-LEAVED SaGITTARIA. 
Leaf wings about 4 the length of blade. Flowers arranged as in No. 1. 
Leaf stalks bend outward. Fruit with a very small beak less than 1/10 
length of fruit. Situations similar to No. 1. August-September. 
3. §. Engelmannia, J. G. Smith. (Fig. 7, pl. 6.) ENcrELMann’s 
ARROW-HEAD. Stem quite slender, leaves very narrow, basal lobes being 
linear, about 4 as long as the blade. The bracts below the pistillate 
flowers about 1/3 the length of the flower pedicels. The fruit (achene) 
is terminated by a beak, nearly 4 its own length, which points directly 
upward. Situations similar to No. 1. August-September. 
4. §. latifolia, Willd. (Fig. 3, pl. 7.) BRoap-LEAVED ARROW-HEAD. 
Variable in size and form. Flower scape from 6 in. to 2 ft. tall. Leaves 
often very broad, but also sometimes quite narrow. Lobes 1/4 to 1/3 as 
long as blade. The beak at the summit of the fruit points obliquely or 
almost horizontally. 
5. §. heterophylla, Pursh. (Fig. 4, pl. 7.) SrssmLe-rrurTep ARRow- 
HEAD. (S. rigida, Pursh.) Plant from } to 2 ft. high. Leaves variable, 
from broad linear, almost grass-like, to lance-shaped or elliptic or ovate, 
about as high as flower stalk. Pistillate (lower) flowers with very short 
pedicel (sessile), staminate flowers above, on long pedicels. Fruit with 
an upright beak } length of the fruit itself. 
6. §. graminea, Michx. GRaAss-LEAVED SAGITTARIA. Leaves linear, 
lance-shaped or elliptic. The pistillate flowers on pedicels as long as or 
longer than those of the upper staminate flowers. Ponds, our area, 
7. §. Eatoni, J. E. Smith. Eaton’s Sacirrarta, Aquatic with mostly 
bladeless leaves or rarely with these leaf-stems expanding to a linear 
lance-shaped blade. Flower stem 4 to 8 in. high, weak, bearing 1, 2 or 
rarely 3 whorls of flowers. Lowest whorl with 2 fertile and 1 staminate 
flower.. Pedicels of fertile flowers about 4 in, long. In new edition of 
