A SECOND OHIO WEED MANUAL, 



Fig. 19. Tumbleweed. 



Seeds, as shown in the illustration, enlarged four times, round, lenticular, 

 1-32 inch in diameter, dark brown, smooth and very shining-. Met with in 

 clover seed. Here, however, less fre- 

 quent than the seeds cf pigweed, Ama- 

 /anthus hybriduSy from which they may 

 be distinguished by the more dis- 

 tinct wing-like border. To be de- 

 stroyed like other similar annuals by 

 preventing the ripening of its seeds, 

 which mature from August to the end 

 of the season. 



101 Low Amaranth (A) *Amaran- 

 thus blitoides (Wats.) The low ama- 

 ranth is a native of the western states 

 and has become generally introduced 

 in waste places and along railways. 

 It differs from the preceding in its 

 prostrate growth, lying and spreading 

 upon the ground. Seeds readily dis- 

 tinguished from the preceding by their 

 double size and similar winged border. 

 To be dealt with as the last. 



102 Pigweed, Redroot, Amaranth, 

 {h.)*Amaranthus hybridus L. Pigweed 

 is very common in cultivated fields, 

 growing two to four feet high. It is 

 abundant in gardens and especially in corn and potato fields after they are 

 laid by. The leaves are broad, with wavy margin and long stalks (petioles). 

 These are frequently attacked by a white mold, Cystopus Bliti, that also attacks 

 beets. It may be expected to harbor the beet feeding beetle, Systena tamiafa, 

 already mentioned. 



Seeds like those of tumbleweed, about 1-20 inch in diameter, without any 

 manifest border. This large group of annual weeds, belonging to the buck- 

 wheat, goosefoot and pigweed families, all require similar measures for their 

 destruction. The seeds ripen from August to November and in addition, are no 

 doubt abundantly stored in most garden soils. Later cultivation and more 

 thorough removal of the weeds in corn, potatoes and other tilled crops is needed 

 to reduce the number of these weeds. 



103 Rough Pigweed (A) *Amaianthus retrqflexus 

 L. Rough pigweed is distinguished from the preceding 

 by its pale green color, roughish stems and spikes of 

 double thickness; the growth is generally stouter but 

 weedy characters the same. Seeds slightly smaller 

 than those of No. 100. Plant naturalized from tropical 

 America. 



104 Spiny Amaranth (A) Amaranthus spinosus L. 

 Is another of the pigweed tribe. It differs chiefly in 

 the pair of spines in the leaf axils. The leaves, blos- 

 soms, etc., Fig. 20, will at once suggest the class to 

 which it belongs. In southeastern Ohio this weed 

 appeared just after the war, having possibly been 

 transported from the south in material sent back from 



Fig. 20. Spiny Amaranth, that region. Locally it is called soldier-weed. 

 [After Millspaugh.) 



