96 
2. T. ANGusTiFOLiA. Lesser Cat’s-tail. July — August. 1/ 
Grew in tlie brick ponds on Dringhouses moor, near York, six years 
ago ; I believe it is now destroyed. Ponds by tbe road side from 
York to Pocklington. In a pond on the York road, half a mile from 
Selby. In the mere at Scarbro’. Boggy pond at Howe bridge farm, 
near Malton. 
2. SPARGANIUM. 
1. S. RAMosuM. Branched Bur-reed. July — August. 1/ 
In strong clayey ditches, frequent. 
Curtis observes, that the larvae of Phalcena Festucce feed upon the leaves ; and that the rare insect 
Sphex Jissipcs may sometimes be detected in a web under the leaves. 
2. S. SIMPLEX. Unbranched Bur-reed. July— -August. % 
Ditches on Dringhouses moor. Askham bogs, and in the Foss, near 
York. Ponds in Castle Howard Park. Ditch near Ganthorpe. St. 
Trinien’s ponds, near Richmond. Bolton beck. 
3. S. NATANS. Floating Bur-reed. July — August. 1/ 
In the Foss, Hob moor, and other places near York. Scarbro’. 
Beverley. (Staveley carr and ponds near Ripon. B. G.) 
ORDER LXXXI. FLUVIALES. 
1. POTAMOGETON. 
1. P. NATANS. Broad-leaved Pond-weed. July. 7/ 
In pools, ditches, &c. common. 
2. P. HETEROPHYLLus. Various-leaved Pond-weed. July — September. 7/ 
Ditches near Beverley. In the river Foss at Huntington, near York. 
Malham tarn. Downholme moor, near Richmond. 
3. P. PERFOLiATUs. Perfoliate Pond-weed. July — August. % 
Slow rivers and ponds, frequent. 
4. P. DENSUS. Close-leaved Pond-weed. June — July. 7/ 
In the fish-ponds at Acomb. Gilling beck, below Skeeby, near 
Richmond. In the Rye and Derwent. 
5. P. FLUiTANS. Long-leaved Floating Pond- weed. July — August. 7/ 
Ditches near Beverley. Near Ripon. York. In the river Derwent. 
6. P. LUCENS. Shining Pond-weed. June — July. 7/ 
In the rivers Derwent and Rye. 
7. P. CRispus. Curled Pond-weed. June — July. 7/ 
In the river Swale at Clink bank. Ponds at Castle Howard. Ponds 
at Tilmire near York. Plantation pond, Scarbro’. In the rivers 
Rye and Derw^ent. Malton ings. 
