38 PANICEAE 



compete with most lield crops and produce abundance of 

 seeds which are scattered in one way or another, largely by 

 man himself. We need say only a few words about each as 

 they are discussed more at length in a bulletin on weeds. 



Sand Bur (Cenchrns tribuloides) is common in 

 door yards and in fields, especially hay fields, in the late 

 summer. The seeds are distributed widely by man and 

 domestic animals. The plant is particularly i>estiferous in 

 alfalfa fields, and an aggravating nuisance in door yard grass 

 plats. 



Two species of Foxtail ( CJiaclochloa glauca and C. 

 viridis) are common in fields and gardens, their seeds 

 probably having been introduced with garden seeds. Barn- 

 yard Grasses (Echinochloa spp. ) of which there are about 

 four well marked forms, usually occur on lands which have 

 been fertilized with stable manure and have been flooded. 

 They will not grow in very dry soil. Under certain 

 conditions one of them is sown for the crop of coarse, poor 

 hay that .it produces, but this is done only to prevent entire 

 loss of crop on the land for the season. Land that for any 

 reason is too wet for most hay crops may sometimes be sown 

 in Barnyard grass and make a crop that is somewhat better 

 than nothing. The grass is tall, coarse and succulent and 

 the hay is hard to cure perfectly a-.d if not properly cured it 

 is apt to mould. It produces a very heavy tonnage of green 

 fodder but is not of good quality and not much relished by 

 animals. 



Crab-grass (Synflierisiiia sangiiijiale) is vcrv well 

 known to :lie average farmer especially if he has lived in the 

 Southern States. It is one of the most common weeds in 

 cotton fields. It is not very common in New Mexico because 

 the region is too drv. It occurs sparingly as a door yard weed. 



Several of the true Panicums listed below, one of 

 which is the common sprangling "tickle grass," as the children 

 call it. and all of which resemble it somewhat, are common or 



