Localities.— In ditches and pools, mostly on a gravelly soil; but not com- 
mon. — Berks ; On Winkfield Plain, near Windsor: Rev. Dr. Goodenough. 
Ditches about Soulhcote, near Reading : 3\1 r. Fardon. Bracknel near Windsor: 
Rev. E. F. Witts. — Cornwall ; Between Penzance and Marazion: Mag. Nat. 
Hist. Mr. Watson could not find it there. — Essex ; In pools and gravel-pits 
on Epping Forest, near Walthamstow, not uncommon; and in a pond near 
Rumford, as mentioned by Ray: Mr. E. Forster, jun. Plentiful in the pools 
about Woodford: L. W. Dillwyn, Esq. Wanstead Park: Mr. Sowerby. 
Ponds on Epping Forest, by the sixth milestone on the Lea-Bridge road, Wan- 
stead: N. J. Winch, Esq. — Herts; Dropmore Common: N. J. Winch, Esq. 
Totteridge Green : Mr. J. Woods, jun. — Kent ; Bogs on Ashdown Forest: Mr. 
T. F. Forster, jun. In a pool under the Cliff between Folkstone and Sand- 
gate, sparingly : L. W. Dillwyn, Esq. In a pond at East Church in Shepey : 
E. Jacob, Esq. in PI. Faversh. On Waterdown Forest, and in the ponds in 
Abergavenny Park: FI. Ton. — Middlesex; In a little bog at Harefield: 
Blackstone. Iver Heath towards Denham : Martyn. Near Hammersmith : 
Mr. Teesdale. Finchley Common : Mr. J. Woods, jun. Hounslow Heath ; 
and about London in several places: Curtis. — Shropshire ; Ellesmere Mere: 
Rev. A. Bloxam. — Suffolk /At Framlingham : Rev. Mr. Crabbe. — Surrey ; 
Abundant on Battersea and Wandsworth Commons: Mr. W. Pamplin, jun. 
and Mr. W. H. Baxter. New Pond, on Earlswood Common: Mr. G. Lux- 
ford. Ponds on Clapham Common ; Hedge Court Pond; in a pond on Esher 
Common, between Claremont Park and Claygate; in a small pond on Ditton 
Common, just in front of Ember Grove ; near Shilton’s Cottages, on the same 
Common; also on the opposite side of the Portsmouth road, in the bed of the 
Rye, near to the Turnpike House. Claygate, in a small pond by the road-side 
leading to the Telegraph Hill; Coulsdon ; near Cobham ; on Putney Heath; 
pit almost opposite the Wells at Streatham ; on Tooling and Leatherhead Com- 
mons ; and in ponds near Ewell: N. B. G. — Sussex; Pits on St. John’s, 
Chailey, and Broadmere Commons ; and at Henfield : N. B. G. Between 
Sheffield Aims and Horsted Keynes: Mr. E. Jenner. 
Perennial. — Flowers in June and July. 
Root of many long pale fibres. Leaves all radical, floating, 
oblong, bluntish, somewhat heart-shaped at the base, 5-nerved, 
quite entire, smooth and glossy, like every other part of the plant. 
Petioles ( leaf- stalks ) long, almost semicylindrical, broad and mem- 
branous at the base, tapering upwards. Scape (flower-stalk,) from 
6 inches to a foot hign, bearing 1 or 2 whorls of flowers. Petals 
white, very delicate, inversely heart-shaped, each having a yellow 
spot at the base. Capsules (fig. 5.) 6, spreading in the form of a 
star, awl-shaped, compressed, 1- or 2-seeded, closely combined at 
the base, so as to appear like a single fruit. Seeds (figs. 7 & 8.) 
oblong, tuberculated and transversely striated, compressed, with a 
deep furrow on each side, occasioned by the form of the embryo 
within, which is cylindrical and bent double, somewhat like a 
horse-shoe (fig. 9). 
This plant is a native of France and Siberia, as well as of Eng- 
land ; it is subject to much variation in size, according to the 
depth of water in which it grows. — The specimen figured was 
sent to me by my very kind friend Mr. E. Jenner, of Lewes, to 
whom I am indebted for several other rare plants. 
