A HISTORY OF HERTFORDSHIRE CONVOLVULACE.S Cuscuta europasa, L. efithymum, Murr. PLANTAGINE.S Litorella lacustris, L. SCROPHULARINE.S Verbascum blattaria, L. virgatum, With. Linaria spuria, Miller Limosella ajuatlca, L. OROBANCHE^: Orobanche minor, Suit. CHENOPODIACE/E Chenopodium vulvaria, L. ficifolium, SOT. PoLYGONACE^ Polygonum minus, Huds. Rumex palustris, SOT. (limosus, Thuill.) EUPHORBIACE.S: Euphorbia platyphyllos, L. Mercurialis annua, L. SALICINEJE Salix russelliana, SOT. HYDROCHARIDEJE Hydrocharis morsus-ranae, L. ORCHIDEJE Malaxis paludosa, Sw. Cephalanthera pallens, Rich. ensifolia, Rich. Orchis ustulata, L. militaris, L. Herminium monorchis, Br. Habenaria bifolia, Br. LILIACETE Ruscus aculeatus, L. Polygonatum multiflorum, All. Fritillaria meleagris, L. JUNCE* Juncus diffusus, Hoppe squarrosus, L. Luzula Forsteri, DC. NAIADACEJE Potamogeton rufescens, Schrad. acutifolius, Link obtusifolius, Mert. et Koch CYPERACEJE Ekochans acicularis, Br. (Hooker Heleocharts) Scirpus caricis, Retz. (Blysmus compressus, Panz.) Carex paradoxa, Willd. Icevigata, Sm. GRAMINEJS Setaria viridis, Beauv. Alopecurus fulvus, SOT. Calamagrostis lanceolata, Roth Gastridium lendigerum, Gaud. Bromus racemosus, L. Hordeum silvaticum, Huds. (Elymus europaeus, L.) DISTRICT V. THE BRENT This is the smallest district, only four or five square miles of a tongue of the county somewhat similar to that of the Thame district being in the catchment-basin of the Brent. It is bounded on the east by a detached portion of the Lea district, on the north-west by the Colne district, and on the north and south by Middlesex. It is entirely on the London Clay. The Brent rises in Middlesex half a mile from Barnet Gate in Herts, and after a run of four miles leaves our county, flows past Finchley, through the Brent Reservoir, and, joining the Grand Junction Canal at Hanwell, enters the Thames at Brentford. This is an interesting district, chiefly owing to the presence of Totteridge Green and its ponds, in which grow Ranunculus lingua and Acorus calamus, the former however having been planted and therefore not being entitled to a place in the list of species. Totteridge Green is our only locality for Damasonium stellatum. It was first recorded there in 1805, by 1849 '* na< ^ become very scarce, and it was last seen in 1855. Chenopodium glaucum has been seen much more recently in its only locality, Totteridge. Many common plants are not recorded for the district, perhaps partly from its small size, but chiefly from its flora not having been thoroughly investigated. The only indigenous plants in this district which are rare are the following CARYOPHYLLEJE Dianthus deltoides, L. Cerastium quaternellum, Fenk,. ROSACEJE Prunus cerasus, L. ONAGRARIEJE Epilobium roseum, Scbreb. COMPOSITE Pulicaria vulgaris, Gtertn. Anthemis nobilis, L. Arctium nemorosum, Lej. BORAGINEA Symphytum tuberosum, L.
