6 CONTENTS. 



II. Descriptions of the Seeds of the Commercial Bluegrasses and Their 



Impurities — Continued. Page. 



Weed seeds commonly found with commercial bluegrass seeds 32 



Bursa hnrsa-pastoris (L. ) Britton, shepherd' s-purse 32 



Lepidium virginicum. L. , peppergrass 32 



Cerastium vulgatum L. , mouse-ear chickweed 32 



Alsine media L. , colnmon chickweed 32 



Alsine graminea (L. ) Britton 33 



Carduus arvensis (L. ) Robs., Canada thistle 33 



Taraxacum taraxacum ( L. ) Karst. , dandelion 34 



Matricaria inodora L., scentless camomile 34 



Hierac'mni sp. , hawk weed - 34 



Anthemis rotula L. , dog fennel, mayweed 35 



Chenopodium album L., lamb' s-quarters, pigweed 35 



Plantago lanceolata L., rib-grass, buckhorn, English i)lantain 35 



Rumex crispus L. , curled dock 36 



Rumex acetosella L., sheep's sorrel, sorrel 36 



Veronica arvensis L. , corn speedwell 36 



Juncus tenuis Willd., slender rush 37 



Juncoides campestre ( L. ) Kuntze, field rush 37 



Juncoidcs albida DC. , wood rush 37 



Carex cephalophora Muhl. , oval-headed sedge 37 



Ergot occasionally found in commercial bluegrass seed 38 



Claviceps purpurea (Fr. ) Tul. , ergot 38 



