14 



2. — Notes on the Flora of the Watfoed District . 



By Arthur Cottam, F.E.A.S. 



[Read 8th April, 1875.] 



The following list contains some of the plants which in two 

 years' not very careful or continuous collecting I have come across 

 in this District. Many others more common are, of course, omitted. 

 I have added in parentheses a few that I believe are, or at least 

 ought, to be found here, but which have escaped my notice. 



There are some few genera that require careful examination — 

 Viola, for instance. V. hirta grows in the middle of Cassiobury 

 Park ; V. canina, and one or two of its sub-species would, I believe, 

 be found in our woods and lanes, but it is a matter of some 

 difficulty to separate them. 



Our District docs not contain any of those parts of the County 

 in which Chalk is at the surface, and therefore the exclusively 

 chalk plants, of which many and some very rare ones are in- 

 cluded in the Hertfordshire Flora, are not found here. 



The number preceding each plant is its number in the ' London 

 Catalogue,' seventh edition, 1874. 



6. Thalictrum flavum. — Bushey Mill. 

 11. Myomncs minimus. — Corn-fields, "Watford Heath; and be- 

 hind the Oi-phan Asylum. 



22. Ranunculus sceleratus. — Edge of Haydon Hill Pond, Bushey. 

 24. R. Flammula. — Bricket Wood; abundant. 

 27. R. auricomus. — Copse at the beginning of Rouse Bam Lane ; 

 and many other places ; unusually fine. 



34. R. arvensis. — Corn-fields ; occasionally. 

 36. Caltha palustris. — Very common in wet fields. 

 40. Helleborus viridifi. — Mr. Elcy's (private) wood, Oxhcy ; 

 and in a copse between Watford and Lcavesden. 



57. Chelidonium majiis. — Hedge banks ; abundant. 

 82. Diplotaxis muralis. — Railway banks. 

 92. Dentaria hdhifera. — Woods at Red Heath. 

 98. Arahis thaliava. — Arable fields and roadsides. 

 110. Nasturtium officinale. 

 112. N. palustre. — River banks. 

 128. Thlaspi ar reuse. — Fields and roadsides ; occasionally. 



205. Stellar ia aqicatica. 



206. S. nemorum. 



207. S. media. 



208. S. holostea. 

 210. S. graminea. 



202. Maha moschata. — Roadsides; not uncommon. 



271 . Limim angustifoUum. — One plant near Haydon Hill, Bushey. 



Geranium. — Of tlu; twelve species of this genus, we have six, 

 and pro])ably a seventh. 



277. G. pyrenaicum. — Common ; by the Workhouse ; in Hagden 

 Lane ; and by the Railway Arch in Water Lane. 



