12 



Descriptions of the Weed-seeds Illustrated on the Opposite 



Page. 



31. Prickly Lettuce. Seeds one-eighth to one-sixth of an inch in 

 length ; broadly lance-shaped ; each face has 5-7 ribs ; color dark 

 brown, somewhat mottled with black ; apex is tipped with a beak 

 which is almost as long as the seed. 



32. S-piny So^i^ Thistle. One-eighth of an inch in length ; varying 

 from oval to lance-shaped ; flat ; each face bearing three narrow 

 ridges which meet at the ends ; surfaces smooth ; color straw-colored 

 to reddish brown. 



33. Perennial Smv Thistle. Slightly spindle-shaped with blunt 

 ends and often much flattened ; five coarse, finely wrinkled ri(1ges 

 runnino- lenffthwise on each face ; dark reddish-brown ; about one- 

 eighth of an inch long. 



34. Fleahane. Seeds one-twentieth of an inch long ; oval ; rem- 

 nants of pappus bristles remaining often at the apex. 



35. Dandelion. Seeds one-eighth ot an inch long; exclusive of 

 short beak ; lance-shaped in outline ; ten ridges running lengthwise ; 

 provided with barb-like teeth towards the apex ; color varies from 

 light to dark brown. 



36. Wild Carrot. Seeds each one-eighth of inch in length ; and 

 flattened on the back ; primary ribs slender, bristly, and five in 

 number ; secondary ribs, 4 in number, each bearing a row of barbed 

 prickles. 



37. Pigeon Weed. Nutlets one-twelfth of an inch long; egg- 

 shaped and curved ; scar is conspicuous ; surface roughened ; gray in 

 color. 



38. Broad-Leafed Plantain. Seeds about one-twentieth inch 

 long ; flattened ; outline variable from oval to rhomboidal ; wavy lines, 

 on surface ; color, brown. 



39. Pig-Weed. About one-twenty-fourth of an inch in length; flat- 

 tened, egg-shaped, or lens-shaped ; polished and jet black ; a slight 

 notch on sharp edge is the scar ; near the scar-notch is a small pro- 

 jecting point. 



