28 K. A. PRYOR NOTES ON A PROPOSED 



Middlesex,' the -vrritcr e-\adcntly intended his note to refer to the 

 species opposite to which he wrote it, Tithymalus segetum longifolius, 

 — E. platyphjlla of modern writers. 



Salix purpurea. — Eickmansworth. 



S- Lamhertiana occurs north of Harefiekl, and not improhahly in 

 Herts. 



S. rugosa. — jS'ear Pinchfiekl ; hetween Moor Hall and Hamper 

 Mill. 



8. repens. — Bacher Heath; Eickmansworth Common Moor; 

 Bricket Wood Common ; and in the adjoining district of Middlesex, 

 seemingly S. fusca. 



Sparganmm, sp. — I am informed that a floating Sparganium has 

 been noticed just on our side of the county boundary near Pinner 

 Hill. 



Potamogeton polygonifoUus. — Bacher Heath. The usual heath 

 form is the var. ericetorum of Syme, but the deep water plant 

 occurs in a ditch on Harrow Weald Common ; either or both may 

 be found in Herts. 



P. riifescens. — Ditches by the Colne between Eickmansworth and 

 Harefiekl Mill. 



P. pusillus. — Eickmansworth Common Moor. Something under 

 the name of compres&ua has been recorded fi-om streams at Harrow 

 Weald in Mr. Melvill's 'Flora of Harrow.' P. mucronatus of 

 Schrader, with which P. compresms of Smith has been generally 

 identified, is arranged by Dr. Hooker and others as a variety of 

 pimllus, and our plant may possibly be found to come under the 

 same form. 



P. pectinatus. — Eickmansworth ; and in the Grand Junction Canal 

 to the north of Harefiekl. P. jiahellatus occurs in the same waters 

 in the neighbourhood of Tring, and will perhaps be found to ac- 

 company pectinatus in this district also. But the great increase 

 of Anacharis has been very unfavourable to the existence of our 

 rarer pond weeds. 



Zannichellia palustris. — Eickmansworth. Where is this station ? 



Hijdrocharis Morsm-rana. — Near Watford ; and long ago observed 

 by Blackstono as abundant at Harefiekl, where however it has not, 

 I believe, been met with lately. The Watford locality requires 

 some more precise definition. 



Orchis militaris. — In a chalky thicket near Comer Hall. This 

 is in the extreme south-western angle of the county, and at 

 no gi'eat distance fi-om, if, as I cannot lielp suspecting, it is not the 

 same place as, " the old chalk-pit near the paper-mill at Harefiekl," 

 where 0. militaris was observed by Blackstone in company with 

 0. purpurea and ustulata, and Ophrys apifera and muscifera. A 

 larg(t (iialk-pit is marked in tlie Ordnance ^lap in the immediate 

 neighbourhood. There is liowever a specimen of 0. militaris in 

 the lianksian herbarium from a second station near Harefiekl, 

 which is undoubtedly in Middlesex. 



0. latifolia. — On the Common ^foor, and other low meadows near 

 Eickmansworth. This will probably turn out to be 0. incarnata. 



