88 Flora of Shetland 



Ord. Naiadacece 



1. Triglochin palustre (Marsh Arrow-grass). 

 Turfy or spongy bogs. Common. 



T. maritimum (Sea Arrow-grass). Salt 

 marshes. Frequent. 



2. Potamogeton natans (Floating Pond- 

 weed). Shallow pools. Common. 



P. lanceolatus (Lanceolate Pondweed). 

 Grows with P. heterophyllus at Burrafirth, 

 Unst. (Edmondston's note.) The editor 

 failed to confirm this record. 



P. heterophyllus(Various-leaved Pondweed). 

 Deep muddy burn at Burrafirth and Burn of 

 Vallafield,Unst,and elsewhere. Not unfrequent. 



P. perfoliatus (Perfoliate Pondweed). Loch 

 of Cliff and near North Roe. 



P. crispus (Curly Pondweed). Loch of 

 Tingwall. Loch of Cliff, Unst. 



P. pectinatus (Fennel-leaved Pondweed). 

 Brackish pools at Dales Voe, and Baltasound. 



3. Ruppia spiralis (Spiral Tassel-grass). 

 Near Mossbank, Dales Voe, and near Busta. 



R. rostellata (Beaked Tassel-grass). Ditches 

 in the saltmarsh at Hoove, upper end of 

 Whiteness Voe. (Beeby in Scot. Nat. 1889- 

 90). 



