The Scottish Naturalist. 23 



322 ambigua Ehrh., B. Occurs among S. repens. 



323 repens L., B. Not uncommon. 



b. fusca. Common in many places, D. and H. 

 g. argentea. Downs in Sanday, Neill. 



324 Lapponum L. 



a. arenaria, Hoy Hill, H. Doubtful. 



325 Arbuscula L., Hoy Hill, Neill. Doubtful. 



b. prunifolia, valleys in Hoy Neill. Doubtful. 



326 herbacea L., Hoy Hill, B. Walls H. ; Rousay. 



327 reticulata L., Hoy Hill, H. 



CONIFERS. 



JUNIPERUS L. 



328 nana Willd., B. Hoy. Dr. Traill, of Woodwick, tells me it 

 occurs on Fair Isle. 



TYPHACE^E. 

 Typha L. 



329 latifolia L. Loch of Aikerness Evie, D. and H. Doubtless 

 introduced. It occurs only in one patch, covering perhaps 

 half an acre of the swamp which once was the loch. 



Sparganium L. 



330 ramosum Huds., B. Local, but common in the streams con- 

 nected with Loch of Kirbuster, also Lurquoy Burn, Orphir, 

 Harray, Scalpa, &c. 



331 simplex Huds. Burn of Scalpa, D. ; Howan in Birsay, 

 J. W. H. T. 



332 affine Schnizl., Hoy, B. Sandswater, Walls, H. Standing 

 Stones of Stennis. 



LEMNACE^E. 

 Lemna L. 



333 minor L., B. " Dr. Macnab, extremely doubtful," D. and H.'s 



list. I have specimens from Tankerness gathered by Mr. 



Cowan. 



NAIADACE^E. 



POTAMOGETON L. 



334 natans L. Ditch near Maeshowe, and Loch of Harray, B. 



335 Polygonifolius Pour., B. Common. 



336 heterophyllus Schreb., B. Common. 



337 nitens Web. Loch of Harray 1873, B. 



338 perfoliatus L., B. Common. 



339 crispus L., B. Rousay H. Ditch draining Loch of Aikerness, 

 Evie, 1882. 



