RE-ISSUE OF THE FLORA OF HERTFORDSHIRE, 23 



Cardanwie amara. — Riverside between Harefielcl and Rickmans- 

 worth. First observed by Blackstone, and not noticed since 1822. 

 Specimens from this locality gathered by the late Mr. Cory, in the 

 herbarium of the Eev. A. Bloxam of Twycross, establish the 

 correctness of the name. It might still be re-fonnd. 



Nasturtium amphihiuin. — Cashio Bridge Waters. Requires con- 

 firmation. 



Viola syhatica. — V. Riviniana is the Middlesex plant ; V. Reich- 

 enhachiana, however, which is not uncommon in Herts, will almost 

 certainly be found. It flowers earlier than the other form. 



Poly gala vulgaris. — P. eu-vulgaris has been noticed at Harefield, 

 but P. depressa is the usual plant of Middlesex. It occurs on 

 Stanmore Heath, and Harrow Weald Common. 



Drosera rotundifolia. — The Bushey Heath station given in the 

 Supplement to the ' Flora Hertf ordiensis ' is perhaps really on Harrow 

 Weald Common, and in Middlesex. 



Cerastium semidecandrum. — Walls near Watford. Cerastium arvense. 

 — In the chalk cutting near the Watford station. Both these observa- 

 tions should perhaps be received with some degree of reserve. A 

 form of C. triviale, with unusually large flowers, occurs in several 

 places on the newly constructed embankment in the same neigh- 

 bourhood, and something of the kind may perhaps have been 

 mistaken for C. arvense. 



Arenaria serpyllifolia. — A. serpyllifolia and leptoclados are 

 probably equally common, as in Middlesex ; the latter occurs at 

 Harefield. 



" Alsine montana minima, Acini effigie, rotundifolia.''^ — "In 

 montosis comitatus Hartfordise ad confinia Bucks prope vicum 

 Chalfont D. Petri dictum. D. Plukenet." Ray, Synopsis, ii. 210. 

 Dillenius conjectured that this was Centunculus minimus, but it 

 seems more probable that it was a variety of some Arenaria. 

 The connexion of Plukenet, one of the most eminent of the 

 botanists of the seventeenth century, with this neighbourhood, 

 through his farm at Horn Hill, will not be altogether without 

 interest to the members of our Society. He has left notes of 

 several other plants that he observed, and his name, with that of 

 Blackstone, will always be associated with the botanical history 

 of the district. 



Sagina nodosa. — Wall of Rickmansworth Churchyard. Blackstone, 

 Specimen Bot. 3. Blackstone could hardly have been mistaken in 

 this plant, but the station seems improbable. 



Spergula arvensis. — Watford and Rickmansworth. S. vulgaris, 

 with papillose seeds, is the plant of North Middlesex. 



Scleranthtis amiuiis. — Watford. "The Harefield plant seems to 

 be S. biennis,'^ with shorter stems, internodes, and calyx-lobes. 



Montia fontana. — Bacher Heath ; Bushey Heath. This last is 

 perhaps in Middlesex, where M. minor is the commoner form, and 

 occurs on Harrow Weald Common. M. rivularis has, however, 

 been noticed on Stanmore Heath, and both varieties will not im- 

 probably be found in Herts. 



