. . Fig. 3. — Potamogeton foliosus. Fig. 4. — Potamogeton pusillus. PLATE XXXV. —WIDE-RANGING SPECIES OF PONDWEEDS. (From Morong.)(After Biological Survey.) CONSERVATION OF GAME BIRDS. 579 Wood Ducks and Black Ducks are fond of this pondweed and itgrows commonly in some of the ponds of Massachusetts. Thewidgeon grass of the south Atlantic coast of the United Statesis quite a different plant, — the ditch grass {Riippia maritima).The sago pondweed (P. pectinatus) (Fig. 25) appears to be themost important duck food, and in some cases it

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. . Fig. 3. — Potamogeton foliosus. Fig. 4. — Potamogeton pusillus. PLATE XXXV. —WIDE-RANGING SPECIES OF PONDWEEDS. (From Morong.)(After Biological Survey.) CONSERVATION OF GAME BIRDS. 579 Wood Ducks and Black Ducks are fond of this pondweed and itgrows commonly in some of the ponds of Massachusetts. Thewidgeon grass of the south Atlantic coast of the United Statesis quite a different plant, — the ditch grass {Riippia maritima).The sago pondweed (P. pectinatus) (Fig. 25) appears to be themost important duck food, and in some cases it forms fromsixty to eighty per cent, of the food of the Canvas-back. Itis known sometimes as fox-tail grass. It is a submergedplant, like the other pond-weeds, and, like them, bearssmall clusters of seeds ornutlets near the are formed somewhatlike little bunches of ripen at differenttimes, but in the northmay be looked for afterAugust. Figs. 25 and 26show the threadlike leaves,the slender rootstocks andthe tubers. Pondweeds may

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Keywords: ., bookauthorjobherbe, bookcentury1900, bookdecade1910, bookyear1912