The Flora of Glamorgan. gi 



thyr ! E. and F. Park Mill stream ! L. and T.H.T. Waycock 

 River ! D. Oxwich ; Penllergare ; banks of Loughor ; Neath ; 

 Llantwit Major ; Ridd. River Thaw ! Probably along every river 

 in the County. 



Senecio, Linn. 224. 



838. vulgaris, Linn. Common Groundsel. Greulys, Garnedd felen, 



neu Penfelen fenyw. 

 Common. Abundant. Native. Agrestal, viatical, etc. 



This is an aggregate species, and includes in the immediate 

 neighbourhood of Cardiff four distinct forms and their hybrids. 

 The radiate form of the Channel Islands and at least one continental 

 form are distinct from these. 



About the year 1891 I began to examine the striking radiate 

 type which is so abundant around Cardiff and Penarth, and in 

 January, 1894, Dr. C. T. Vachell directed the attention of the members 

 of the Cardiff Naturalists' Society to it. A specimen was sent to 

 Kew and Mr. Hemsley reported upon it as follows : — " I cannot 

 make anything of this, but vulgaris b. radiatus." 



The occurrence of two distinct radiate forms in my own garden 

 at Penarth and the discovery of a dwarf form growing amongst 

 normal individuals in Cathays Park, combined with the necessity 

 for distinguishing these for record in the Flora, induced me, ten 

 years later, to submit all the forms to a process of testing by means 

 of experimental " pedigree " cultures. The experiments commenced 

 in September, 1905, and, partly owing to the discovery of additional 

 forms, are still in progress. 



Confining our attention to Glamorgan plants, I find it necessary, 

 as one result of these experiments, to recognise the following 

 segregates : — - 



a. praecox, Trow, Found at Cathays Park, Cardiff ! and in 



Penarth ! 



b. erectus, Trow. Apparently abundant in Glamorgan. 



c. erectus, var. radiatus. Trow. Found at Cardiff ! Penarth ! 



and Barry ! and according to Riddelsdell, at Oystermouth and 

 Port Talbot. 



d. multicaulis. Trow, Found at the Hayes ! Swanbridge ! and 

 Barry Dock ! 



Hybrids of these probably occur in every possible combina- 

 tion (6). 



The following have been obtained experimentally, and sometimes 

 by each of the two possible ways : — 



prcBCOx X erectus, var. radiatus. In this case, erectus, var. 

 radiatus is dominant. 



erectus x erectus, var. radiatus. 



multicaulis x erectus, var. radiatus. 



