CONTRIBUTIONS TO A FLORA OF PORTLAND. 123 



Petasites fragrans, Presl. Winter Heliotrope. Alien. II. 



By roadway leading from Southwell road through Chene 



to sea ; thoroughly naturalised ; F. 



Senecio squalidus, L. Oxford Ragwort. Casual. Natural- 

 ised. II. Sides of Railway at Chesil Station ; abundant. 

 Obs. Introduced with railway ballast 1902. " It 

 is undoubtedly spreading from Oxford along the 

 lines of the Great Western Railway by way of 

 Didcot, Reading, etc ; " Flo. Bris., 380. 

 S. erucifolius, L. Hoary Ragwort. Native. II. Freq. 



Extending to Lower Lighthouse. 

 Carlina vulgaris, L. Carline Thistle. Native. II. Freq. 



Mostly on East side. " Luxuriant specimens ; " Druce. 

 Arctium minus, Bernh. Lesser Burdock. Native. II. 



Com. 

 Carduus nutans, L. Musk Thistle. Native. II. Com. White 



flowers freq. 

 Cnicus aeaulis, Willd. Ground Thistle. Native. Var. 



caulescens, Pers. II. West Cliff. Freq. about 



Churchope. 

 Silybum Marianum, Gaertn. Milk- Thistle. Denizen or 



Alien. II. Rare. Noted, Gibson. Flo. Dor. Ed. 2, p. 



21. Above Fortune's W T ell, 1878. Quarry Easton ; 



F. 

 Serratula tinetoria, L. Sawwort. Native. II. Rare. 



Pastures Fortune's Well, 1872 ; Revd. H. E. Fox. 



East Weare near " Shepherds' Dinner ; " F. Churchope, 



1882 ; Sir W. Medlycott. 

 Centaurea nigra, L. Black Knapweed. Native. The type 



is rare. II. Radiate form, (var. radiata), at the Bill 



with pure white and ordinary rose-pink flowers growing 



together, 1895 ; W . Whitwell. 



Var. decipiens, (Thuill.). I. and II. Com. 

 C. Scabiosa, L. Greater Knapweed. Native. II. Abundant 



on the limestone. 



Obs. C. decipiens, (Thuill.) and C. Scabiosa, L. are 

 equally com., I think. 



