FOOD HABITS OF MALLARD DUCKS. 
17 
TABLE I Enos of vegetable food identified in stomachs of mallard ducks and the number 
in which found—Continued. 
Kind of food. 
RofalnumMbenousloMmachsiexantmnedeee n= keen ee oe Sa. ee oe ees 
SuBKINGDOM SPERMATOPHYTA—Continued. 
Potamotegonacee. 
Potamogeton lucens (shining pondweed).......-.:--.------------------ 
Potamogeton prelongus (white-stemmed pondweed)...-.-....-----.--- 
Potamogeton foliosus (leafy pondweed) 
Potamogeton friesii (Fries pondweed) 
Potamogeton pusillus (small pondweed)........-------------------2--: 
Potamogeion pectinatus (sago pondweed) 
Potamogeton perfoliatus (redhead grass) .......-------------!-+-1------ 
Potamogeton sp. (unidentified pondweed) 
RALp DUP Maritim Qvaadseon-Prass) =a: 222 4-2-2 se se de EA 
Zannichellia palustris (horned pondweed) 
Zostera marina (eelgrass) 
Naiadaceee. 
Naias fiezilis (bushy pondweed) 
Juncaginacee. 
Triglochin maritima (arrow-grass) 
Alismacee. 
IE CHULOEOTALSISD A (UBM Ca Ge ree osteo aoe ok ne, Se ee ieee Ree 
Alisma plantago-aquatica (water plantain) 
AIST OS Da WabeIe at CAIM)) ie = ae ee ed Ba fa a ee ee 
Sagittaria platyphyilla (delta potato) 
Sagittaria latifolia (wapato) 
CGULATITCT ES) (BOOSC-ETASS) mats ao eee erie Se ee eee eae eee 
Sagittaria graminea? (grass-leaved wapato) 
Sagitiaria sp. (arrowhead) 
Damasonium californicum 
Hydrocharitacez. 
Philotria canadensis (waterweed) 
Vallisneria spiralis (wild celery) 
Limnobdium spongia (frogbit) 
Graminez. 
Baa LEMP Li COMORASSES HEE wee a a) ia hee Se Se ce ee ae 
Zeaz mays (Indian corn) 
SERU MAE SOLE 555 So Cae a ere eS eam Ie SRN ak hah 
Paspalum distichum 
! POSTOINID SOS og SURSE SOR AS GeO Ie SOO eae eee 
Echinochloa crus-galli (wild millet) 
EAI CU MESD ASAE NET ASS) eis ec a Sas oes oie 2 oes Ne te ee ee 
Panicum dichotomifiorum (switch grass) 
Cheztochloa lutescens (yellow foxtail) 
Chziochloa sp. (foxtail grass) 
CEN ENTAESTS Ma OTITETASS) Pisses a aoa os Soca Se i ae i as 
_Zizantopsis miliacea (cut grass) 
ae Zazaniemprerica (wild TiGe) 2s vos 8 5.28 eben edewecdeecunensece nce 
Homalocenchrus oryzoides (rice cut grass)...........-----..------------ 
Homalocenchrus lenticularis (catch-fly grass) 
Homatocenchruswirginicus Galserice).2..0:..------- 62-202 soe sans ons 
Homalocenchrus sp. (unidentified cut grass). 
Common 
mallard. 
ecesesec--- 
13 | 
ol 
2 Paspalum boscianum and chon punctata also have been identified from a common mallard’s stomach 
by L. H. Dewey. 
64336°—18—Bull. 720-3 
