WEEDS AND THEIR CONTROL 



Sll 



Descriptive List of the Fifty Worst Weeds op the United States — Continued 



COMjrON NAME, 



BOTANICAL NAME 



AND DURATION 



OF LIFE 



COLOR, SIZE, AND 

 ARRANGEMENT 

 OF FLOWERS 



SECTIONS 



WHERE 

 INJURIOUS 



METHOD OF 



SEED 



DISTRIBUTION ; 



VEGETATIVE 



PROPAGATION 



OF THE 

 PERENNIALS 



PLACE OF 



GROWTH AND 



PRODUCTS 



INJURED 



Dodder, alfalfa dodder, 



field dodder (Cuscuta 



arvensis), A. 

 Dogbane, Indian hemp 



{Apocynum canna- 



bium), 1'. 



Fern, brake {Pteridium 

 aquilinum), P. 



Fleabane, horseweed 

 (Erigeron canadensis) , 

 A. 



Foxtail, yellow foxtail, 

 pigeon grass (Chae- 

 tochloa glauca), A. 



Hawkweed, orange 



hawkweed, devil's- 



paintbrush (Hieracium 

 autantiacum), P. 



Ironweed (Vernonia 

 noveboracensis), P. 



Jirason weed (Datura 

 stramonium), A. 



Johnson grass (Holcus 

 halepensis), P. 



Lamb's-quarters, pig- 

 weed (Chenopodium 

 album), A. 



Lettuce, prickly lettuce 

 (Lactuca virosa), A. 



Milkweed, common 



milkweed (Asclepias 

 syriaca), P. 



Morning-glory (Ipomea 

 hederacea), A. 



Mustard, wild mustard, 

 charlock {Brassica ar- 

 vensis), A. 



Nut-grass, coco (Cy- 

 perus rotiindus) , P. 



Pennycress, Frenchweed 

 (Thlaspi arvense), A. 



Pigweed, redroot, care- 

 less weed (Amaran- 

 thus retroflexus), A. 



Plantain, bnckhorn, rib- 

 grass {Plantarjo lan- 

 ceolata), P. 



Yellow ; J inch ; 

 clusters. 



Greenish white : 

 i inch ; ter- 

 minal clusters. 



White ; } inch ; 

 in cymes. 



Green ; spikes. 



Orange ; 1 inch 

 heads. 



Purple ; J inch ; 

 heads. 



Purple; 

 inches ; 

 tary. 



Green ; i inch ; 

 panicle. 



Green ; very 

 small ; panicle. 



Yellow ; J inch ; 

 heads in pani- 

 cles. 



Purple ; } inch ; 

 umbels. 



White, purple, 

 or blue; 1 + 

 inch ; solitary. 



Y'ellow ; J inch ; 

 racemes. 



P.rown ; 1/16 

 inch ; spike- 

 lets. 



White ; J inch ; 

 racemes. 



Green ; quite 

 small ; spikes 

 in panicles. 



White ; 1/10 

 inch ; spike. 



AH clover and 



I'pper Missis- 

 sippi Valley. 



Northwestern 

 States and the 

 Pacific coast. 



Entire United 

 States. 



Entire United 

 States. 



Maine to Ohio. 



Maine to Mary- 

 land and Iowa 

 to Kansas. 



Maine to Min- 

 nesota and 

 Texas. 



Virginia to 



Texas and 



California. 



Entire United 

 States. . 



Ohio to Iowa, 

 Utah to Cali- 

 fornia. 



New York to 

 Minnesota. 



New Y'ork to 

 Missouri. 



Maine to M'ash- 

 ington. 



Maryland to 

 Florida and 

 Texas. 



North Dakota 

 and Minne- 

 sota. 



Entire United 

 States. 



Entire United 

 States. 



Hay, clover ai 

 alfalfa seed. 



Wind ; creeping 

 root. 



Spores scat- 

 tered by wind ; 

 running roots. 



Hay, grass, and 

 clover seeds. 



Animals, hay, 

 grain, and 

 grass seeds. 



Wind, grass and 

 clover seeds ; 

 runners simi- 

 lar to straw- 

 berry. 



Wind; short 

 thick root- 

 stocks, making 

 plant grow in 

 bunches. 



Pods and plants 

 blown by 

 wind. 



In hay, grain, 

 and grass 

 seed : running 

 rootstocks. 



Grain and grass 

 seed. 



Wind. 



Wind ; creeping 

 roots. 



Corn stover, 

 straw, and 

 wind. 



Grain, grass, 

 clover, and 

 rape seeds. 



Wind, nursery 

 stock, hay, 

 and grass 

 seed ; tubers. 



Wind. 



In grain and 



grass seeds ; 



plants blown 



by wind. 

 Hay, clover and 



grass seed ; 



spreads but 



slowly from a 



crown. 



Clover and al- 

 falfa fields. 



Fields with 

 sandy soil; 

 pasture, grain 

 and hoed crops. 



Logged-oflf land, 

 meadows, and 

 pastures. 



Jleadows, pas- 

 t u r e s , and 

 grain fields. 



Land cultivated 

 in early part 

 of season; 

 young grass 

 and clover 

 seedlings. 



Untillable pas- 

 t u r e s and 

 meadows. 



Pastures and 

 meadows. 



Pastures, barn- 

 yards, and 

 waste lands ; 

 seeds, flowers, 

 and leaves 

 poisonous. 



All crops except 

 hay. 



Grain fields and 

 hoed crops. 



Everywhere ; all 

 crops. 



All crops and in 

 pastures. 



C ul tivated 



fields, espe- 

 cially corn, and 

 small grain. 



Small grain 

 fields and mead- 

 ows ; grains. 



All soils ; hoed 

 crops. 



Grain fields and 

 pastures ; grain 

 and dairy pro- 

 ducts. 



Plowed land; 

 hoed crops. 



Everywhere; 

 meadows, pas- 

 t u r e s, and 

 lawns. 



