BACTERIAL DISEASES OF PLANTS 



from every continent, and are already known to occur in plants 

 of one hundred and fifty genera distributed through more than 

 fifty families. 



DISTRIBUTION 



Following Engler's arrangement, I will list these families 

 that you may see how wide is the distribution of bacterial 

 diseases in plants and how utterly wrong were those who said 

 that there were no such diseases, and also those who conceded 

 a little but said that they were very rare and restricted to the soft 

 underground parts of a few bulbous and tuberous plants, and 

 generally preceded by fungi (German writers and their follow- 

 ers). In this list, I have included only the flowering plants, 

 but some of the cryptogams are also subject to bacterial attack. 

 The number following the family name indicates the number 

 of bacterial diseases known within the limits of the family. 

 The total of the figures, however, will not give the number of 

 bacterial parasites, because some of the diseases overlap. 



TABLE I 



SHOWING THE FAMILIES OF FLOWERING PLANTS ARRANGED SERIALLY FROM LOWEST 

 TO HIGHEST. THOSE CONTAINING GENERA SUBJECT TO BACTERIAL DISEASES 

 ARE UNDERSCORED, AND WHEN SEVERAL DISEASES HAVE BEEN RECOGNIZED 

 THEIR NUMBER IS ALSO GIVEN 



1. Cycadaceae 17. Gramineae 14 34. Juncaceae 



2. Ginkgoaceae 18. Cyperaceae 35. Stemonaceae 



3. Taxaceae 19. Phoenicaceae 36. Melanthiaceae 



4. Pinaceae 2 19. Palmae 37. Liliaceae 3 



5. Gnetaceae 2 0. Cyclanthaceae 3S -Convallariaceae 



6. Typhaceae 21. Araceae 39. Smilacaceae 



7. Pandanaceae 22. Lemnaceae 36 - 



8. Sparganiaceae 2 3. Flagellariaceae 37 - ! Liliaceae 



9. Potamogetonaceae 24. Baloskionaceae | 



10. Naiadaceae 2 4. Restionaceae 



11. Aponogetonaceae 25 Centrolepidaceae 4 ^ - Haemodoraceae 



12. Scheuchzeriaceae 2 6. Mayacaceae 4 J- Amaryllidaceae 



12. Juncaginaceae 27 Xvridaceae 4 ^' ^ e ^ oz i aceae 



13. Alismaceae 28 Eriocaulaceae 43- Taccaceae 



14. Butomaceae 29^ Rapateaceae 44 ' Di scoreaceae 



15. Vallisneriaceae 30. Bromeliaceae 45 ' Indaccae 



15. Hydrocharitaceae 31. Commelinaceae 46 - Musaceae 



16. Triuridaceae 32. Pontederiaceae 47 - Zingihoraceae 



17. Poaceae 33. Philydraceae 48. Cannaceae 



