30 MISSOURI BOTANICAL GARDEN. 
S. graminea, S. heterophylla, S. longiloba and 8. pa- 
pillosa, Horizontal or oblique rhizomes are present in S. 
lancifolia and S. graminea cycloptera. The tubers of 
latifolia, graminea and heterophylla, are edible. They are 
used by the Indian tribes of the Northwest, and are called 
either Wappatoo, or Wabesipinig, the latter meaning Swan- 
potatoes, because of their furnishing food for the numer- 
ous wild-fowl of that region. The tubers are formed in 
the mud at the depth of 2 to4dm. In the spring they 
throw out a long rhizome which forms at its upper end a 
corm, and from this corm arise the roots and leaves. 
The descriptions given in the following synopsis have 
been drawn as far as possible from herbarium specimens or 
the living plants. The exceptions were Sagittaria lanci- 
folia angustifolia (Lindl.) Griseb., and Lophotocarpus 
Guyanensis (HBK. )Mich., both from Mexico. These were 
adapted from Micheli, because of the insufficiency of 
material in the herbaria examined. 
Since contributing a list of the Sagittarias of the Eastern 
United States to the Mem. Torr. Bot. Club, Vol. 5: 25 
(1894), I have examined fuller material of 8. graminea 
platyphylla, and have thought best to raise the variety to 
specific rank. 
The limited bibliography given includes the principal 
works used in the preparation of this paper. It was 
believed that its value as a systematic monograph would 
not be enhanced if the great mass of minor references were 
printed. I have endeavored to make the synonymy com- 
plete as far as original descriptions of American species 
are concerned. Buchenau and Micheli have given the 
fuller bibliography, and I will refer any who are interested 
in the study of these genera to their cited works. If 
deemed necessary, the more complete bibliography may be 
published at some future time. 
Saqirraria L. Sp. Plant, 993 (1753). — Flowers all 
unisexual, but the staminate frequently with abortive pis- 
tils at center; filaments inserted above the receptacle. 
4 
