FLORA OF FORFARSHIRE. 177 
P. perfoliatus , L. Perfoliate Pond- weed. H. 340, B. 
324.— F. July. P. 
Lakes of Rescobie and Balgavies, frequent. 
P. litcens, L. Shining Pond- weed. H. 340, B. 323. — 
F. June, July. P. 
Lakes of Rescobie and Balgavies, frequent. 
P. prcelongus , Wulf. Long-stalked Pond-weed. H. 340, 
B. 324. — F. June, Sept. P. 
Lakes of Rescobie and Balgavies, Prof. Balfour, Messrs 
Croall, Cruickshank, and Kerr. 
Plentiful in the stream after leaving the Loch of Balgavies, 
and onward to Guthrie ; first found, I believe, by Prof. Bal- 
four, Mr A. Croall. 
P. heterophyllus, Schreb. Various-leaved Pond- weed. H. 
341, B. 323. — F. June, July. P. (P. gramineus, Fries, 
&c.) 
Rescobie Lake. 
Dun’s Dish, Mr J. Cruickshank. Near Montrose, Mr D. 
White. 
P. lanceolatus, Sm. Lanceolate Pond-weed. H. 341, B- 
323. — F. July, Aug. P. 
Lake of Lintrathen, Mr G. Don. South side of Resco- 
bie Lake, Mr A. Croall. In a small pond on Monroman 
Moor, Mr J. Cruickshank. 
P. rufescens, Schrad. Reddish Pond-weed. H. 342, B. 
323. — F. July. P. (P. fuitans, Sm.) 
Near Forfar, Mr Maughan. Rescobie Lake, Dr ADNab. 
Lake of Balgavies, and in a marsh below Guthrie, Air J. 
Cruickshank. 
P. natans , L. Sharp-fruited broad-leaved Pond-weed. 
H. 342, B. 322. — F. June, July. P. 
The most common species, plentiful in ponds, ditches, 
marshy pools, streams, and lakes throughout the county. 
