64 ERYTHEA. 



exterminated or be driven to inaccessible places. Whether the 

 type that persists is to be Oriental or Occidental, time alone can 

 decide. 



In the following list the families of plants are ranked according 

 to the number of the species collected. Specimens are in the 

 Herbarium of the California Academy of Sciences. 



Composite. 



1. Achillea Millefolium L. (Yarrow). Northern Hemisphere. 



2. Anthemis Cotula DC. (Mayweed, Dog-fennel). Europe, 

 Africa, North America. 



3. Bxria uliginosa Gray. California. 



4. Centaurea Melitensis L. (Tocalote). Europe. 



5. Centaurea solstitialis L. (Star Thistle). Europe. 



6. Cotula axistralis Hook. Australia and New Zealand. 



7. Erigeron Canadensis L. (Flea-bane). American, now Cos- 

 mopolitan. 



8. Hypochseris glabra L. Mediterranean Region. 



9. Madia sativa Molina (Tar-weed). California. 



10. Matricaria discoidea DC. (Manzanilla). California. 



11. Senecio vulgaris L. (Old Man of Spring). Cosmopolitan. 



12. Silybum Marianum Gaertn. (Milk Thistle). Mediterranean 

 region. 



13. Sonchus oleraceus L. (Sow Thistle). Cosmopolitan. 



14. Taraxacum officinale Weber. Cosmopolitan. 



15. Troximon apargioides Less. California. 



16. Troximon humile Gray. Western North America. 



Gramine^e. 



1. Avena fatua glabrescens, Coss. (Wild Oats). Europe, Asia, 

 North America. 



2. Avena barbata Brot. (Wild Oats). Europe, Asia, North 

 America. 



3. Bromus breviaristatus Buckl. North America. 



4. Bromus intermedins Guss. Mediterranean region. 



5. Bromus rigidus Roth. Mediterranean region. 



