Page:VCH Hertfordshire 1.djvu/97

 BOTANY Ulex nanus, Forst. Medicago falcata, L. Trifolium subterraneum, L. Hippocrepis comosa, L. Lathyrus aphaca, L. (Orobus) tuberosus, L. silvestris, L. ROSACE* Prunus cerasus, L. Geum intermedium, Ehrh. Rosa stylosa (v. systyla), Bast. Crataegus monogyna, jacq. mentioned (p. 28). The Bulbourne below Berkhamsted, the Gade below Two Waters, and the Colne below Rickmansworth, are frequently incorporated with the Grand Junction CanaL Leaving our county near Harefield, the Colne, flowing southwards, passes Uxbridge, where k begins to divide into numerous irregularly anastomosing channels which have several mil It into the Thames at and above Staines. To the presence in the valley of the Ver of an old city, more interesting in its a tions than any other in the kingdom, is due the existence in Hertfordshire of Diplstaxis folia, Silent nutans, and Hieradum muranan, for they grow nowhere in the county but on old walls in St. Albans. Colney Heath, near the head of the Colne, is of much botanical interest, chiefly owing to its marshes and swampy meadows. It is our only habitat for the very rare Ljthrum bjfsopifiKa, and also for TtndaRa nudicauRs, while we nave only one other locality, a different one in each case, for four of its plants Radiala hmda (Northaw), Ctsttmmcmha minimus (Moor Park), Cuscuta epitbjmum (No Man's Land, St. Albans), and Pttanugettn acmti- foKui (London Colney). The rarer plants of this district and those peculiar to it make a rather long list. They are RAKUSCCUCEJE LTTHRJUUIM Anemone pnlsatilla, L. Lj&nm bjsufifiBa, L. Helleborus foetidus, L. riridb, L. PAPAVZRACI* Papaver Lecoqii, Lamotte FITUARIACLS Fumaria Vaillantii, Loisel. CRUCIFIX* Nasturtium amphibium, Br. Dtntaria buttnfera, L. Dipbtaxis tenuifoRa, DC. Erophila praecox, DC. Lepidium ruderale, L. Iberis amara, L. TeesdaHa nudicauKs, Br. POLYGAUB Polygak oiyptera, Reicbb. CARYOPHYLLEJE Silene nutans, L. Cerastium quaternellum, Fenlz. Arenaria (Alsine) tenuifolia, L. LlNEJE Radiola Knaides, Gmel. GERANIACEA Geranium ntundifoKum, L. CRASSULACE* Sedum fabaria, Koch OXAGRAUEJE Epilobium roseum, Scbrtb. UMBELLJFEIJE Buplenrom rotundifolium, L. Carom (Buniom) bulbocastanum, Kxb Cicuu virosa, L. (Enantht enccata, L. Caucalis dancoides, L. RVBIACEJE Galium erectom, Huds. VALERIANLS Valeriana officinalis, L. Valerianella auricula, DC. COMPOSITE Pnlicaria vulgaris, Gtfrtn. Filago apicuku, G. E. Sm. spathulata, Presl Senecio (Cineraria) campestris, DC. Arctinm intermedium, Lange nemorosum, Lej. Centaurea calcitrapa, L. CarJutts tnuiflorus, Curt. Crepis uraxacifolia, Thrill. Hieraciitm muronun, L. CAUPANULAC&K Campanula rapunculus, L. ERICACEJE Vaccinium myrtyUus, L. Erica cinerea, L. Pyrola minor, Sto. ntundifoRa, L. PRIMULACE* Ccntunculus minimus, L. GENTIANEJK Gentiana campestris, L. germanica, Willd. BoRAGINEjE Cynoglossum montanum, Lamk. 55