PHENOLOGY OF WEEDS 

 BLOOMING PERIOD OF COMMON WEEDS 



787 





Stellaria media A. Chickweed 



Capsella bursa-pastoris A. Shepherd's purse 



Mediaago lupulina A. Yellow trefoil 



Oxalis corniculata A. & P. Lady's sorrel 



Taraxacum officinale P. Dandelion 



Nepeta hederacea P. Ground ivy 



Barbarea vulgaris B. Yellow rocket 



Cynoglossum boreale B. Hound's tongue 



Plantago lanceolata P. Buckhorn 



Ranunculus abortivus B. Small-flowered buttercup. 



Ranunculus septentrionalis P. Buttercup 



Rumex altissimus P. Smooth dock 



Taraxacum erythrospermum P. Small-flowered dan- 

 delion 



Allium canadense A. & P. Wild garlic 



Asclepias speciosa P. Showy milkweed 



Brassica arvensis A. Wild mustard 



Bromus tectorum A. Downy brome grass 



Carum carvi B. Caraway 



Cerastium viscosum A. & P. Mouse-ear chickweed. 

 Convolvulus arvensis P. European morning-glory. 



Convolvulus sepium P. Wild morning-glory 



Datura tatula A. Purple thorn-apple 



Euphorbia marginata A. Snow-on-the-mountain. . . . 



Euphorbia preslii A. Spurge 



Glycyrrhiza lepidota P. Wild liquorice 



Hierochloe odorata P. Vanilla grass 



Hordeum pusillum A. Small squirrel-tail grass 



Lepidium apetalum A. Apetalous peppergrass. . . . , 



Lepidium virgimAcum A. Wild peppergrass 



Lithospermum arvense A. Corn gromwell 



Lolium italicum B. or P. Italian rye-grass 



Malva rotundifolia P. Common mallow 



Oxybaphus nyotagineus P. Wild four-o'clock 



Plantago major P. Door-yard plantain 



Plantago purshii A. Pursh's plantain 



Potentilla anserina P. Silverweed 



Radicula palustris A. or B. Marsh cress 



Rhus toxicodendron P. Poison ivy 



Rudbeckia hirta B. Black-eyed Susan 



Rumex acetosella P. Sheep sorrel 



Sisymbrium officinale A. Hedge mustard 



Solanum carolinense P- Horse nettle 



Solanum rostratum A. Buffalo-bur 



Sonchus oleraceus A. Sow thistle 



Trifolium procumbens A. Hop clover 



Verbena bracteosa P. Bracted verbena 



Veronica peregrina A. Speedwell 



Vieia sativa A. Vetch 



Achillea millefolium P. Yarrow 



A. Annual. 



B. Biennial. 

 P. Perennial. 



+ 



+ 



+ 



+ 



+ 



+ 



+ 



+ 



+ 



+ 



+ 



+ 



+ 



+ 



