FOOD HABITS OF MALLARD DUCKS. 



21 



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

 in which found— -GoritinneA. 



Kind of food. 



Common 



mallard. 



Blaok 

 duck. 



Southern 

 black 

 duck. 



Total number of stomachs examined 



SUBKINGDOM SPERMATOPHYTA— Continued. 



Cappandacese. 



Clcome senulata (three-leaved spider flower) 



Altingiacese. 



Liquidambar styraciflua (sweet gum) 



riatanacese. 



Platanus occidentalis (sycamore) 



Rosacea^. 



Rosa sp. (rose) , 



Rubus sp. (blackberry) , 



Cratxgus sp. (red haw) 



Amygdalacese. 



Prunus virginiana (chokecherry) 



Prunus sp. (cherry) 



Csesalpinaeese. 



Cassia sp. (serma) 



Fabacese. 



Trifolium sp. (clover) 



Medicago denticulata (bur clover) 



Lespedeza sp. (bush clover) , 



Lespedeza striata (Japan clover) , 



StrcypTiostyles sp. (wild bean) 



Pisum sativum (cultivated pea) , 



Unidentified 



Geraniaceae, 



Geranium longipes 



Geranium sp 



Rutaceae. 



Citrus sinensis (cultivated orange) 



Euphorbiaceae. 



Croton sp. (spurge) 



Euphorbia sp. (spurge) 



CalUtrichacese. 



Callitriche sp. (water starwort) 



Empetraceae. 



Empetrum nigrum (crowberry) 



Anacardiaceae. 



Rhus glabra (smooth sumac) 



Rhus toxicodendron (poison ivy) 



Rhus sp. (unidentified sumac) 



Aquifoliaceae. 



Ilex vomitoria (youpon) 



Ilex decidua (swamp holly) 



Ilex verticillata (black alder) 



Ilex sp. (holly) 



Sapindaceae. 



Cardiospermum halicababum (balloon vine) . 

 Balsaminaceae. 



Impatiens biflora (touch-me-not) 



Vitaceae. 



Vitis sp. (grape) 



339 



