. Bulletin of the Department of Agriculture. Agriculture; Agriculture. PROPAGATION OP WILD-DUCK FOODS. 17 The species of ducks and swans thus far found to feed upon pond- weeds are the following: Sheldrake, red-breasted merganser, hooded merganser, mallard, black duck, Florida duck, gadwall, European widgeon, American widgeon, green-winged, blue-winged, and cin- namon teal, shoveller, pintail, wood duck, redhead, canvas-back, greater and lesser scaups, ring-necked duck, golden-eye, buffle-head, white-winged and surf scoters, ruddy duck, and whistling swan. DESCRIPTION OF PLANTS. The most
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. PROPAGATION OP WILD-DUCK FOODS. 17 The species of ducks and swans thus far found to feed upon pond- weeds are the following: Sheldrake, red-breasted merganser, hooded merganser, mallard, black duck, Florida duck, gadwall, European widgeon, American widgeon, green-winged, blue-winged, and cin- namon teal, shoveller, pintail, wood duck, redhead, canvas-back, greater and lesser scaups, ring-necked duck, golden-eye, buffle-head, white-winged and surf scoters, ruddy duck, and whistling swan. DESCRIPTION OF PLANTS. The most important species, so far as known, is the sago pondweed (Potamogeton pectinatus). This plant has numerous, rather long, threadlike leaves, which present a loose, broomlike appearance in the water. The plant is in some places known as foxtail grass. It is known also as eelgrass, and apparently is the plant termed in Europe poker or pochard grass, after a duck closely related to "our redhead. In autumn sago pondweed bears small clusters' of light-brown seeds or nutlets near the surface of the water, in form somewhat like loose bunches of grapes. The other pondweeds bear seeds in the same way, and vast numbers of them are eaten by ducks. The general appearance of sago pondweed is well shown by figure 17; note the brush of fine Fig. 17.—Sago pondweed. (Reduced. From threadlike leaves and the seed Sunset Masazilie> February, 1905.) clusters as above described. Here also are shown the tender root- stocks with their tubers, delicacies much sought by many ducks. Figure 18 illustrates the tubers natural size. All pondweeds of the pectinatus group have tubers, and may there- fore be substituted for sago pondweed for propagating purposes. These species are similar in general appearance and hardly dis- tinguishable by the layman. The scientific names and general ranges of the species in the pectinatus group are as follows:, Potamogeton flliformis Northern States, Southern Canada
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