87 



north of the site of the old Forcing -houses . In this 

 spot, in wet clay soil, the plant is extremely abundant, 

 covering part of the area at the present time with dense 

 m^pses of plants in fruit. Its combination of vigorous 

 rhizomes with abundant seed-production, and its success 

 in this area, indicate that it most richly deserves to be 

 called a "pernicious weed". The danger from it is evi- 

 dently greatly reduced, however, and its general diss^- 

 ination greatly delayed, by its markt adaptation to wet 

 soil. 



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15. RAPilAllDS (Sourn.) L. 



40. iaphanus sativus L. 

 Scientific name : >^ 



Kaplianus sativus L. Sp. PI. 669. 1763. 

 Oonmon names : 



Itadlsh. 



Ganden radish. 

 Distribution and habitat. 



Native of Asia, introduced from Europe. "Culti- 

 vated, and occasionally spontaneous for a year or two 

 in gardens and fields, rarely in waste places" (B. M.>. 



