PHENOLOGY OF "WEEDS 789 



BLOOMING PERIOD OF COMMON WEEDS— Continued. 



Rumex obtusifolius P. Bitter dock 



Saponaria vuccaria A. Cow-herb 



Sida spinosa A. Prickly sida 



Sisymbrium altissimum A. or B. Tall hedge mustard . 



Stachys pahistris P. Woundwort 



Teucrium canadense P. Germander 



Tribulus terrestris A. Caltrop 



Verbascum thapsus B. Mullein 



Verbena hastata P. Blue vervain 



Bromus hordeaceus A. Soft chess 



Agrostemma githago A. Corn cockle 



Verbena stricta P. Hoary vervain 



Atriplex patula A. Orach 



Acnida tuberculata A. Water hemp 



Avena fatua A. Wild oats 



Ambrosia artemisiifolia A. Small ragweed 



Ambrosia trifida A. Large ragweed 



Arctium lappa B. Burdock 



Bidens cernua A. Sticktight 



Bidens discoidea A. Sticktight 



Bidens frondosa A. Sticktight 



Chenopodium hybridum A. Maple-leaved goosefoot.. 



Cichorium intybus P. Chicory 



Cirsium discolor B. Field thistle 



Cirsium ioense B. Iowa Thistle 



Cirsium lanceolatum B. Bull thistle 



Cleome serrulata A. Stinking clover 



Cuscuta arvensis A. Field dodder 



Digitaria humifusa A. Smooth crab grass 



Dyssodia papnosa A. Fetid marigold 



Eragrostis pilosa A. Pilose eragrostis 



Erechtites hieracifolia A. Fireweed 



Enpatorium urticae folium P. "White snakeroot 



Oaura biennis B. Gaura 



Govolobus laevis P. Anele-Dod 



Helianthus annuus A. (Wild) Sunflower 



Ipomoea hederacea A. "Wild morning-glory 



Iva xanthifolia A. Poverty weed 



Kochia scoparia A. Kochia 



Lolivm, perenne P. Rye grass 



Melilotus officinalis A. or B. Yellow sweet clover.. 



Mentha spicata P. Spearmint 



Physalis subglabrata P. Smooth ish ground cherry. . 



Polygonum convolvulus A. Black bindweed 



Polygonum erectum A. Erect knotweed 



Polygonum hydropiper A. "Water pepper 



Polygonum muhleniergii P. Tanweed 



Polygonum pennsylvanicum A. Pennsylvania smart- 

 weed 



Polygonum ramosissimum A. Branching knotweed. . 



Potentilla monspeHensis B. or P. Five-finger 



Salsola kali var. tenuifolia A. Russian thistle 



Scro.phularia maryiandica P. Simpson's honey plant. 

 Setaria glauca A. Yellow foxtail 



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