. Bulletin of the Department of Agriculture. Agriculture; Agriculture. PROPAGATION OF WILD-DUCK FOODS. 37 Thirty-seven canvas-backs collected at Lake Surprise had eaten various parts of this plant to the extent of per cent of their diet. This is a second illustration of the unusual phenomenon of the canvas- back's being attracted to shallow water by a highly prized food. Six ring-neck ducks, or blackjacks, made more than 91 per cent of their food of this plant, and two southern black ducks (Anas ful- vigula) 98 per cent. The following ducks also were feeding on the plant: Mallard, pi
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. PROPAGATION OF WILD-DUCK FOODS. 37 Thirty-seven canvas-backs collected at Lake Surprise had eaten various parts of this plant to the extent of per cent of their diet. This is a second illustration of the unusual phenomenon of the canvas- back's being attracted to shallow water by a highly prized food. Six ring-neck ducks, or blackjacks, made more than 91 per cent of their food of this plant, and two southern black ducks (Anas ful- vigula) 98 per cent. The following ducks also were feeding on the plant: Mallard, pintail, lesser scaup, redhead, and shoveller. The parts eaten are the rootstocks, stolons, tubers, and seeds. Mr. Charles W. Ward has furnished rootstocks of Castalia mexicana from Avery. Fig. 32.—Two types of leaves of banana waterlily. (The larger outline half natural size.) Island, La., with the information that this plant and wild celery (Vallisneria spiralis) furnish the bulk of the food of canvas-backs in that locality. • DESCRIPTION OF PLANT. The banana waterlily is the only native species of the group of true waterlilies (as discussed above) that has yellow flowers. But the leaves and flowers of this species may either float on the sur- face of the water or stand a few inches above it. The leaves are green above with brown mottlings and vary from greenish to purplish red below with small black markings. The edges of the cleft of the leaf are either somewhat separated or overlapping (fig. 32). The. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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