THE WILD FLORA OF KEW GARDENS. 73 



P. lapathifolium, L. B and P. Fairly common. 



P. amphibium, L. Strip. Several plants in moat. 



Euphorbia Helioscopia, L. P. In Rose-bed near Pagoda. Strip. 

 In company with. Lamium amplexicaule. Mr. Lynch has known of 

 it in this spot for several years, but the present season, 1874, I have 

 only been able to find there a single starved plant. In 1873 not one 

 was seen. 



E. Peplus, L. Very common everywhere. 



Mercurialis perennis,Z. P. A.mung stones near Merlin's Cave. 

 A few patches in wood. 



M. annua, L. P. Waste ground near Temperate House. 



Ceratophyllum aquaticum, E.B. The var. demersum grows 

 plentifully in the moat nearly the whole length of the Gardens. 



Parietaria diffusa, Koch. 13. Walls about Herbarium. P. Old 

 Ruined Arch. Strip. By side of towing-path and on wall of moat. 



Urtica dioica, L. Common in back parts of shrubberies and in 

 woods. 



U. urens, L. Frequent wherever the soil gets turned. 



Typha latifolia, L. P. Lake. Strip. Side of moat. 



[T. angustifolia, L. Not a truly wild Kew plant. Wherever it 

 occurs in our Flora it has been planted.] 



Sparganium ramosum, Huds. Strip. Really wild about moat. 

 Planted near lake and elsewhere. 



Acorus Calamus, L. B. All round pond, very plentiful near the 

 steps. P. Lake. Strip. Frequent. 



Arum maculatum, L. B. On the mound Vhere the Scrophularia 

 vernalis grows. P. At foot of wall from '* Unicorn Gate " to oppo- 

 site " Douglas Spar." 



Lemna minor, L. Common on lake and moat. 



L. gibba, L. P. On the lake in company with the preceding and 

 following species. A few plants were brought me by Mr. T. Ent- 

 wistle, and I have since collected it myself. It is very uncommon. 



L. polyrhiza, L. Lake and moat, very abundant. 



Potamogeton crispus, L. P. A tuft in lake midway between the 

 two islands nearest Palm House. 



P. densus, L. Strip. Rather common. 



P. pusillus, Z. P. Plentiful in small pond (fed with condensed 

 steam from Engine House) at lake end of Cedar Avenue. 



Alisma Plantago, L. Common about lake and near moat. 



Butomus umbellatus, L. Strip. Frequent at edge of moat. 



Hydrocharis Morsus-ranse, L. Strip. In moat nearly the whole 

 length of " Queen's Cottage Grounds." 



Elodea canadensis, Mich. Abundant in every piece of water 

 within our limits, except the pond in front of Palm House. Mr. 

 Smith, the curator of the Royal Gardens tells me that some years ago 

 this piece of water was entirely choked up with this plant, Conferva, 

 &c., and that it was a serious task to keep it anything like clear. For 

 the last two years I have never been able to find any floating plant 

 in it at all. Mr. Smith could not furnish me with any reason for the 

 disappearance of the Modea, &c. He says about the same number, 

 and nearly all the species, of aquatic birds now on the pond were there 

 when it was so bad, and he does not give them credit for having 

 effected such a change. 



