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. Birds of a Maryland farm : a local study of economic ornithology . a i Polygonum penn- sylvanicum).Knotweed I Polygonum aviculare).Climbing false buckwheat (Polygonum scandens I.Bitter dock (Rumex obtusifolius).Curled dock (Rumex crispus).Sheep sorrel | Rumex urtosella).Crab-grass (Panicum aanguinale).Pigeon-grass (ChaetocMoa glauca, fig 27).Green foxtail grass (ChaetocMoa riridis).Broom-sedge (Andropogon virginicus).Sheathed rush-grass (Sporobolus vaginae- floras I.Poverty grass (Aristida sp.).Yard grass ( Eleusine indica).Bermuda grass (Capriola dactylon |.Faspalum I Paspalum sp. |.Sedge (Oyperus).Sassafras (Sassafras sassafras).Blackberry I Rubus vittosus).Pokeberry | Phytolacca decandra).Partridge pea (Cassia chamaecrista).Sweet clover (Melilotus alba).Tick-trefoil (Meibomia nudiflora).Snowdrops ( KneiffUl friiflrosa).Chickweed I Alsme media ).Amaranth (Amaranthua retroflexus, fig. 27).Trumpet creeper ( Tecoma radicans).Yellow sorrel | Oxalis s(ricta). Rib-grass « Plantago lanceolata I. Spurge | l-jii>hri>i<i maculata, fig. 27 i. Pi©. 27.—Weed seeds commonlyeaten by birds: a, bindweed;h, lambs-quarters; < purslane;/, amaranth; . spotted spurge; / ragweed; .ii, rrn-!, rr;i^»: //.dandelion. Lambs-quarters i (henopodium nn>. fig. 27).Purslane (Portulacaoleracea, fig. -. .Jewel-weed i Trnpatiena), i J BIRDS OF A MARYLAND FARM. WEED DESTRUCTION BY NATIVE SPARROWS. Spring. The farmers strongest allies in his campaign against weed-arc the various species of native sparrows (V. XIII). which are apotent aid every month in the year, though chiefly in the coldermonths. The value of their work, obvious in fall and winter, i^ lesseasily appraised in spring and early summer, but may he suggestedby a few note-. The sparrows that breed on the farm have to content themselvesearly in the spring with seeds left from the preceding year, but bythe middle of May they find in fields that have lain tallow all winter, or that were in corn tin4 previous season, a ple
