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).! 
List oF WEEDs.? 
1. Beggar’s lice.* 16. Jamestown weed.* 
2. Beggar’s ticks. 17. Mallow.* 
5. Burdock.* 18. Milkweed. 
4. Buttercup.* 19. Nettle. 
5. Butterweed. 20. Pigweed.* 
6. Cocklebur.* 21. Plantain.* 
7. Charlock.* 22. Pokeberry. 
8. Chicory.* 23. Purslane. 
9. Chickweed. 24. Quick-grass.* 
10. Daisy, ox-eye.* 25. Ragweed. 
11. Dandelion.* 26. Sandbur. 
12. Dock. 27. Smartweed. 
13. Dog fennel.* 28. Tansy.* 
14. Fox-tail grass.* 29. Thistle.* 
15. Horse-nettle. 30. Yarrow. 
1 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., may be pressed and 
kept as roughly prepared herbarium specimens, while such very large plants as 
Jamestown weed, dock, ete., may be hung up by the roots and thus dried. 
2 The 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. 
. Cynoglossum officinale. 
. Desmodium Canadense ; Bidens fron- 
dosa. 
. Arctium Lappa. 
. Ranunculus bulbosus. 
. Erigeron Canadensis. 
. Datura Stramonium. 
. Malva rotundifolia. 
. Asclepias Cornuti. 
. Urtica gracilis. 
. Chenopodium album; 
Amarantus 
retroflexus. 
3 
a 
5 
6. Xanthium spinosum. 21. Plantago major. 
7. Brassica Sinapistrum. 22. Phytolacea decandra. 
8. Cichorium Intybus. 23. Portulacca oleracea. 
9. Stellaria media. 24. Agropyrum repens. 
10. Chrysanthemum leucanthemum. 25. Ambrosia artemisizfolia. 
11. Taraxacum officinale. 26. Cenchrus tribuloides. 
12. Rumex crispus. 27. Polygonum Hydropiper. 
13. Anthemis Cotula. 28. Tanacetum vulgare. 
14. Setaria glauca. 29. Cnicus lanceolatus ; Cnicus arvensis. 
15. Solanum Carolinense. 30. Achillea millefolium. 
