. Bulletin - Biological Survey. Zoology, Economic. 12 FOOD HABITS OF THE which are furnished with formidable spines. This grass is a very vile weed of the southern fields and the orange groves of ; The seeds of other grasses, including cockspur grass (Echinochloa crus-galli, fig. 2), crab grass {Syntherisma sangui- nalis), and allied species, which are well-known weeds, were fed upon by 31 redbirds, yard grass (Eleusine indica) by 31, and unidentified grasses by 22. Seeds of the nearly related sedges (Carex et al.) were devoured by 41 car- dinals, those of vervians (Ve
. Bulletin - Biological Survey. Zoology, Economic. 12 FOOD HABITS OF THE which are furnished with formidable spines. This grass is a very vile weed of the southern fields and the orange groves of ; The seeds of other grasses, including cockspur grass (Echinochloa crus-galli, fig. 2), crab grass {Syntherisma sangui- nalis), and allied species, which are well-known weeds, were fed upon by 31 redbirds, yard grass (Eleusine indica) by 31, and unidentified grasses by 22. Seeds of the nearly related sedges (Carex et al.) were devoured by 41 car- dinals, those of vervians (Verbena hastata, fig. 3, and V. urticce folia) by 25. Twenty-two birds ate seeds of the well-known ragweeds (fig. 6), and 39 those of various spurges. Among the other weed seeds eaten in smaller quantities are those of dodder, a serious pest in grain crops; vetch, dock, sow thistle, plantains, includ- ing the detestable ribgrass (fig. 4) ; tum- ble weed (fig. 18), sunflower, violets, gera- niums, stargrass, spiny sida, corn grom- well (fig. 5), spiderwort (PI. II, fig. 7), Fife. 2.—Seeds of cockspur grass (Echinochloa crns-galli). (From Hillmaii, Nevada Experiment Station.). 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. Bureau of Biological Survey. Washington : Govt. print. off.
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