388 FOUNDATIONS OF BOTANY 
and field-garlic are only a few of the many examples of 
very troublesome weeds which were at first planted for 
use or for ornament. 
456. 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).? 
~f 
LIST OF WEEDS? 
1. Barn-grass,* Panicum Crus-galli. 
2. Beggar’s lice,* Cynoglossum officinale. 
3. Beggar’s-ticks, Bidens frondosa. 
4. Black mustard,* Brassica nigra. 
5. Blue thistle,* Echiwm vulgare. 
6. Buffalo bur, Solanum rostratum. 
7. Burdock,* Arctium Lappa. 
8. Buttercup,* Ranunculus bulbosus. 
9. Butterweed,* Erigeron canadensis. 
10. Carpet weed, Mollugo verticillata. 
11. Charlock,* Brassita Sinapistrum. 
12. Chess or cheat,* Bromus secalinus. 
13. Chickweed, Stellaria media. 
14. Chicory,* Cichorium Intybus. 
15. Clover dodder,* Cuscuta Trifolii. 
16. Cocklebur,* Xanthium spinosum. 
17. Corn cockle,* Agrostemma Githago. 
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 (see Handbook). Ordinary weeds, such as ragweed, 
pigweed, etc., may be pressed and kept as roughly prepared herbarium 
Specimens, while such very large plants as jimson weed, dock, etc., may be 
hung up by the roots and thus dried. 
2 Names marked inthe list thus * are those of plants introduced from 
other countries, mostly from Europe. 
