ONAGRACE^E. 27 



SPECIES T.—LUDWI GI A PALUSTRIS. Elliot. 



Plate DX. 



Isnardia palustris, Linn. Bab. Man. Brit. Pot. ed. v. p, 122. Hook. & Am. Brit. FL 

 ed. viii. p. 115 ; et Auct. I'/ur. 



Stem, procumbent or floating, emitting roots from the lower 

 nodes. Leaves opposite, shortly stalked, oval, acute, entire. 

 Flowers sessile, axillary. Calyx-segments deltoid, abruptly acumi- 

 nate or sub-cuspidate. Petals rarely present. Capsule oblong- 

 obovate, truncate at the apex, bluntly 4-sided. Plant glabrous 

 and somewhat succulent. 



In pools in boggy soil. Very rare. Buxted, Sussex; Peters- 

 licld lieath and Brockenhurst, Hants. 



England. Perennial. Late Summer. 



Stem 2 inches to 1 foot long, generally branched. Leaves f- to 

 1 inch long, broadly ovate, rather abruptly attenuated into a short 

 petiole, shining. Flowers ^ inch long ; the petals do not seem to 

 have been found on the European plant, but Torrey and Gray, in 

 their Flora of North America, Vol. I. p. 525, state that it has some- 

 times " small reddish petals," and as the American plant appears 

 to be precisely the same as the European, they have probably been 

 overlooked. Style very short. Capsule ^ inch long. Seeds oblong, 

 angular, pale yellowish-brown. 



I have only seen this plant grown on Goose Green or St. Peter's 

 Marsh, between St. Heliers and St. Aubin's, Jersey. It has some- 

 what the habit when growing of Peplis Portula, though much 

 larger ; but the leaves are of the same deep shining green, and the 

 whole plant more or less tinged with dull purplish-red. 



I have followed the American botanists and Mr. Bentham in 

 including Isnardia under Ludwigia. 



Harsh Isnardia. 

 French, Isnardie des Marais. German, Sump/ IsnarcUe. 



GENUS IK—C I R C M A. Linn. 



Calyx-tube turbinate, adhering to the ovary, above which it is 

 constricted and produced in the form of a short obconical-cylindrical 

 tube ; limb divided to the base into 2 reflexed segments, which 

 as well as the part of the tube beyond the ovary separate circum- 

 cissily and fall off after flowering. Petals 2-cleft with obovatc 

 lobes. Stamens 2. Ovary 2-celled, crowned with a disk surround- 

 ing the base of the style, and expanded at the mouth of the con- 



