346 NOTES ON CO. DUBLIN PLANTS. 



NOTES ON CO. DUBLIN PLANTS. 

 By H. C. Hart, F.L.S. 



Glauciuiii jlavum Crantz. This species has become very rare or 

 extinct at Suttou, owing to shifting of beach by high tides and 

 storms. Very abundant at Portrane, near Malahide. 



Lavatera arborea L. Abundant on the Stack Rock at Ireland's 

 Eye up to the summit, to which I climbed in June, 1887. The plant 

 is tolerably surely native here and in a couple of other places in the 

 Howth district. 



Tri(j(iiu'Ua jnirimrascens Lam. In addition to the locality re- 

 discovered by Mr. Colgan (where it is abundant), this forms the 

 sod of an old grassy road leading from the Lighthouse road to the 

 cliff path. Many square yards are covered here by this rare and 

 minute species. 



Caucalis arvensis Huds. Deer Park Quarry, and by the Boggeen 

 brook, near Woodside, Howth. 



'^'Sainbuais Ebulns. Eailway-bank near Sutton Station, on the 

 Howth side. An addition to the Howth Flora. 



Echiuin vulfjare h. Portmarnock, abundantly; and Portrane. 



Hyosojaiinis ni(jer L. Plentiful south of the Howth Lighthouse, 

 and at the Deer Park Quarry. Still abundant on Ireland's Eye. 



Oruhanclic minor Sutt. (not 0. Hcdera-). On July 18th I gathered 

 this at the Portmarnock sandhill district. It was parasitic on the 

 native and abundant plants Lotus curnicnlatus and Ononis arvensis. 

 The situation was an unbroken area of native vegetation. I have 

 gathered this species previously in Wexford and Carlow on intro- 

 duced clover {T. repens) amongst laid-down grass, where it was 

 doubtfully established. The present locality gives the species the 

 right to be held a native in Ireland. The specimens have thickened, 

 almost tiiberous stem-terminations just beneath the surface of the 

 soil. From these the rootlets proceed, and to these rootlets the 

 finer ones of the Lotus were attached. Those in connection with 

 Ononis were of a thicker textvire. There were a good many specimens 

 of the Orobanche. 



\Ballota nigra L. Deer Park Quarry. 



Atriplex rosea L. {A. arenaria Woods). At the Cosh, Howth, 

 and on Ireland's Eye, and between Greenfields and Kilbarrack ; 

 Portmarnock strand opposite Baldoyle, and from that round the 

 point to St. Marnocks, and again close to Malahide, abundantly ; 

 at Portrane Point opposite Malahide. I have not botanized along 

 any of these shores for about ten or twelve years, but for many 

 years previously they were constantly examined, and I feel sure this 

 Atriplex did not occur there then, but had for its only locality that 

 between Layton and Balbriggan, where I was famihar with the 

 plant. If this be so (and I see no reason to doubt it), this sudden 

 great increase of extension of range is a remarkable phenomenon. 

 It may be a reappearance, as it was once recorded, but not since veri- 

 fied, at " Suttou and Baldoyle." An addition to the Flora of Howth. 



