LOCALITIES. 177 



ADDENDA. 



Berkhampstead Common, Verbascum virgatum (?); *Digitalis pur- 

 purea ; woods near, Anemone apennina ; south end of common, Littorella 

 lacustris. This common is an undulating, turfy, furze-grown slope, with 

 a gravelly subsoil, and although of some extent is unproductive from a 

 botanical point of view. The bordering woods are prolific in ordinary 

 woodland plants : near, Alchemilla vulgaris ; meadows by the canal, E. of 

 Berkhampstead, Geum rivale (?) ; woods about, Habenaria chlorantha ; 

 Hypericum Androsaemum ; Lathraea Squamaria. 



73. GERARD'S CROSS AND STOKE COMMONS. 



These commons are about six miles west of that section of the Colne 

 which runs between Rickmansworth and Uxbridge. They are open heaths, 

 differing in character from those of Surrey, inasmuch as the subsoil is 

 gravel and not sand. The flora consists of the more ordinary heath plants, 

 with little out of the common. The country west of the Colne at this 

 distance is of a hilly aspect, covered to a considerable extent with planta- 

 tions and woodlands nearly all enclosed. Subsoil, gravel ; underlying 

 stratum, chalk. The Furze upon the heaths is mostly of the smaller 

 species ; and Heath proper is scarce, Ling predominating. Stoke Common 

 is a broad level expanse, with patches only of moory ground. 



: Aira flexuosa. Linaria repens (hedge near the Sefton 



*Calluna vulgaris. 



*Carex cajspitosa ; *binervis (abundant). 



*Erica cinerea; *Tetralix. 



*Juncus squarrosus. 



Arms, Stoke). 

 *Molinia cserulea. 

 *Nardus stricta. 

 *Pteris aquilina. 

 *Ulex Gallii (mainly) ; europasus. 



Gerard's Cross Common, one mile in its longest diameter from N.W. 

 to S.E. Of greater extent formerly, now much curtailed, and in part 

 enclosed. It slopes to the south-westward into a marshy hollow, 

 bordered by a dark wood. 



*Aira flexuosa. 



*Calluna vulgaris. 



*Carex caespitosa; *binervis (abundant); 



*panicea; flava. 

 *Erica cinerea ; *Tetralix. 

 *Hydrocotyle vulgaris. 



*Juncus squarrosus. 

 *Molinia caerulea. 

 *Nardus stricta. 

 *Pteris aquilina. 

 *Scutellaria minor. 

 *Ulex Gallii (mainly) ; 



Iver Heath is no longer in existence, except nominally. It has long 

 since been enclosed. 



74. BURNHAM BEECHES AND FARNHAM COMMON, 

 WITH ADJOINING WOODS. 



This locality, in the neighbourhood of those described in the preceding 

 section, is nearer Stoke than Gerard's Cross, and about four miles north 

 of Slough ; together they cover a considerable expanse of ground sloping 



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