A FLORA OF GLAMORGANSHIRE 78 



• V - - CharacejE. 



Chara fragilis Desv. L Pi] ton Green. 3. Crumlin Burrows. 

 5. Port Talbot, 6. Porthcawl Sands. 9. Roath.— Var. delicatula 

 Braun. 8. Welsh St. Donat's, Merthyr Tydfil. 



C. aspera Willd. 1. Oxwich. 5. Kenfig Pool. 8. Cardiff, 



Hb. Brit. Mus. 



O. contraria Kuetz. 1. Oxwich, H.S J. G. 5. Kenfig Pool. 



(C. hispida L. 3. Crumlin Bog, B. G.) 



C. vulgaris L. 3 and 4. Crumlin Bog. 5. Port Talbot. 6. 

 Porthcawl Sands. — Var. longibracteata Kuetz and var. papillata 

 Wallr. 6. Porthcawl Sands. 



Tolypella glomerata Leonh. 3. Crumlin Burrows, J. Bot. 1886, 

 p. 377. 



ella flexilis Agardh. 3. Crumlin Bog, B. G.) 

 N< opaca Agardh. 1. Clyne Common, J. Bot. 1886, p. 377. 

 7. Llandough, Cowbridge. 8. Welsh St. Donat's. 



GLAMORGANSHIRE ALIENS. 



The long list of aliens recorded for the county contains a large 

 number of mere dock casuals, and a smaller number of plants of a 

 more permanent character which persist as individuals, and also 

 plants which have gained a settled footing, appear often in new 

 spots, and spread without difficulty, e. g. Saponaria officinalis and 

 Lepidium Draba. 



The line between the native and the alien is difficult to draw. 

 It has seemed advisable to keep in the list of native plants all those 

 which were more probably native ; and to put among the aliens 

 those which were more probably not native. The present Glamor- 

 gan list is, it is hoped, only preliminary to a larger and more 

 complete account of the county flora ; and doubtless some judgements 

 will, in the light of criticism and further experience, be subse- 

 quently reversed. It is, of course, to be understood that the 

 judgment in each case refers only to the species so far as its 

 occurrence in Glamorgan is concerned ; not to its British status. 

 A weakness in the treatment perhaps exists in the too great 

 deference paid to "authority,' 1 even such a great one as that of 

 H. C. Watson: plants like Coronopus didymus, and some of the 

 Valerianellas should perhaps be ruthlessly treated as aliens ; but 

 my experience in the county shows them in rather more likely- 

 looking spots than, e.g. Ranunculus arvensis, R.sardous, the poppies, 

 Brassica alba, B. Napus, B. Rapa, Diplotaxis tenuifolia, Raphanus 

 Raphani strum, Thlaspi arvense. Lychnis Githago, Anthemis airensis, 



&c. Some of these and other species are recorded in Top. Bot. as 

 native on the strength of old records, one or two of which refer to 

 cornfield habitats alone, though most of them are made on even 

 weaker evidence. The cornfield plant is not easy to deal with ; 



Journal of Botany, 1907. [Supplement.] h 





