FOOD HABITS OF MALLARD DUCKS. 



19 



Table I. — Items of vegetable food identified in stomachs of mallard duclcs and the number 

 in which found — Continued. 



Kind of food. 



Total number of stomachs examined .-, 



SuBKiNGDOM SPERMATOPHYTA— Continued. 



Lemnacese — Continued. 



Spirodela polyrhiza (greater duckweed) 



Wolffia Columbiana (water meal) 



Wolffia sp. (water meal) 



Eriocaulaceae. 



Eriocaulon sp. (pipewort) , 



Xyridaceae. 



Xyris sp. (yellow-eyed grass) 



Commelinacese. 



Commelina sp. (dayflower) 



Pontederiaceee. 



Pontederia cordata (pickerel weed) _ 



Liliacese. 



Unidentified 



Convallariaceae. 



Vagnera sp. (false Solomon's seal) 



TriUiaceee. 



Trillium sp 



Smilacese. 



Smilax sp. (greenbriar) 



Marantacese. ' , 



Thalia divaricata 



Juglandacese. 



Hicoria aquatica (bitter pecan) 



Hicoria sp. (hickory) 



Myricacese. 



Myrica ccrifera (bayberry) , 



Myrica carolinensis (bayberry) , 



Myrica sp. (bayberry) 



Salicaceae. 



Salix sp. (willow), leaves and capsules 



Betulacese. 



Carpinus caroliniana (hornbeam) 



Betula sp. (birch) 



Common 

 mallard. 



Quercus alba (white oak) 



Quercus lyrata (overcup oak) 



Quercus sp. (unidentified oaks) 



Ulmaceae. 



Planera aquatica (water elm) 



Celtis missisippiensis (hackberry) 



Celtis sp. (hackberry) 



Polygonacese. 



Eumex persicarioides (golden dock) 



Rumex sp. (dock) ^. . 



Polygonum ampMbium (water smartweed) 



Polygonum arifolium (prickly smartweed) 



Polygonum aviculare (knotweed ; 



Polygonum convolvulus (climbing buckwheat) 



Polygonum dumetorum (climbing buckwheat) 



Polygonum hydropipcr (water pepper) 



1,725 



3 

 1 



1 



1 



35 



159 

 3 



43 



1 



10 

 117 

 S 

 13 

 3 

 1 

 137 



Black 



duck. 



Southern 

 black 

 duck. 



