198 



ELEMENTS OF BOTANY. 



239. study of Weeds. — Select two or more out of the following list 

 of weeds and report on the qualities which make them troublesome from 

 the farmer's point of view (successful from their own).i 



List or Webds.^ 



16. Jamestown weed.* 



17. MaiHow.* 

 Milkweed. 



1. Beggar's lice.* 



2. Beggar's ticks. 



3. Burdock.* 



4. Buttercup.* 



5. Butterweed. 



6. Cocklebur.* 



7. Charlock.* 



8. Chicory.* 



9. Chickweed. 



10. Daisy, ox-eye.* 



11. Dandelion.* 



12. Dock. 



13. Dog fennel.* 



14. Fox-tail grass.* 



15. Horse-nettle. 



18. 

 19. 

 20. 

 21. 



Nettle. 



Pigweed.* 



Plantain.* 



22. Pokeberry. 



28. Purslane. 



24. Quick-grass.* 



25. Ragweed. 



Sandbur. 



Smartweed. 



Tansy.* 



Thistle.* 



Yarrow. 



26. 

 27. 

 28. 

 29. 

 30. 



> This study will be of little value in city schools, since the plants should be 

 examined as they grow. Specimens of the mature weed and of its fruits and seeds 

 may be preserved by the teacher from one season to another for class use. Whole 

 specimens of small plants, such as purslane, may be put into preservative fluid 

 (Appendix). Ordinary weeds, such as ragweed, pigweed, etc., maybe pressed and 

 kept as roughly prepared herbarium specimens, while such very large plants as 

 Jamestown weed, docli, etc., may be hung up by the roots and thus dried. 



2 xhe botanical names, as found in the last edition of Gray's Manual, are given 

 below. Names marked in the list thus * are those of plants introduced from other 

 countries, mostly from Europe. 



1. Cynoglossum officinale. 



2. Desmodium Canadense ; Bidens fron- 



dosa. 



3. Arctium Lappa. 



4. Eanunculus bulbosus. 



5. Erigeron Canadensis. 



6. Xanthium spinosum. 



7. Brassica Sinapistrum. 



8. Cichorium Intybus. 



9. Stellaria media. 



10. Chrysanthemum leucanthemum. 



11. Taraxacum ofllcinale. 



12. Kumex crispus. 



13. Anthemis Cotula. 



14. Setaria glauca. 



15. Solanum Carolinense. 



16. Datura Stramonium. 



17. Malva rotundifolia. 



18. Asclepias Cornuti. 



19. TJrtica gracilis. 



20. Chenopodium album ; Amarantus 



retroflexus. 



21. Plantago major. 



22. Phytolacca deoandra. 



23. Portulacca olera^ea. 



24. Agropyrum repens. 



25. Ambrosia artemlsisefolia. 



26. Cenchrus tribuloides. 



27. Polygonum Hydropiper. 



28. Tauacetum vulgare. 



29. Cnicus lanceolatus ; Cnicus arvensis. 



30. Achillea millefolium. 



