The Flora of Glamorgan. 93 



The hybrid segregates according to Mendel's law. In one test 

 culture — of seeds taken from a single individual of the hybrid erectiis 

 X erectus, var. radiatus — which comprised 449 plants, the progeny 

 proved to be as follows : — 



erectus individuals . . . . . . = 1 09 



erectus, var. radiatus individuals = 114 



hybrids, like the parent plant . . = 226 



The numbers required by Mendel's law for a culture of 44S 

 plants would be 112, 112, and 224. 



The hybrid erectus x squalidus appears to occur, indeed I have 

 one living specimen collected in the Cathays Park which can scarcely 

 be anything else. I have failed, however, to obtain this hybrid 

 experimentally. Six different experiments, extending over two 

 years and involving the raising of hundreds of plants, produced no 

 result. 



It may be added that many, indeed most, of the forms of 

 groundsel subjected to experiment have proved to be " states " 

 which lose their special character even in the first generation. Ed. 



839. sylvaticus, Linn. Mountain Groundsel. Greulys, neu Penfelen 



fynyddawl. 

 Local. Abundant. Native. Glareal, septal, etc. 



Many records have been rejected as too doubtful for insertion. 

 Storrie's notes show that he mixed up several species of Senecio. 

 River gravels of the Ogmore. Miss B. Southgate, Gower. L. 

 Leckwith ? M.A.D. Greenhill. V. Salthouse Point; Rhossili ; 

 Llangenydd ; Penyrheol ; Porthcawl ; Aberdare ; Cwmaman ; 

 Ystradowen. Ridd. Pontypridd ! Mumbles to Caswell Bay ! 

 Horton ! Port Eynon ! Pitton ! Penrice ! Oxwich ! Burry Green ! 

 and other places in Gower. 



The viscid form of this species is proved by my experiments 

 to be sylvaticus x viscosus. 



This hybrid has not yet been observed to occur wild in Glamorgan, 

 though I have collected the two parents in the same quarry. 



840. viscosus, Linn. Stinking Groundsel. 

 I-ocal, Abundant. Native ? Viatical, etc. 



Near Swansea. E. Forster, pm., B.G. Crymlyn Burrows ; and 

 between Marble Mill and Norton. L.W. D.Mat. Cwm Afan. 

 Mr. Motley. Porthcawl sandhills. R.E. and F. Cundall. J. of B. 

 1902. Storrie's records refer to No. 838, erectus, var. radiatus, 

 Trow. Pontygwaith ? Fl. Rhondda. Hirwaun and Aberdare. W. 

 Merthyr District. E. and F. Peterston. M.A.D. Ely. V. 

 Ystalyfera ; Port Talbot ; Pyle ; Barry ; Porth. Ridd. Ponty- 

 pridd ! Taffs Well ! 



841. squalidus, Linn. Inelegant Ragwort. 



Local. Abundant. Alien or Denizen. Viatical. 



This plant is thoroughly established in the Cardiff area, and 

 may possibly have been introduced from Swindon, where it is likewise 

 abundant. Its centre or centres of distribution appear to be the three 



