28 The Scottish Naturalist. 



south of Ronas Voe. A remarkable form occurs on the slop- 

 ng sea-bank at Mid Yell Voe. It produces a long rhizome, 

 which trails over the rocks, sometimes bare, sometimes buried, 

 and bears tufts of leaves and flower-stems at intervals. Dr. Lange 

 names it *var. repens. 



P. maritima L. Also very variable. Var. pygmcea Lange. 

 Y. Alluvial grit, near the mouth of the Arisdale Burn, Hamna 

 Voe. Var. kirsuta Syme. U. Abundant on the Serpentine 

 hills at Baltasound. Doubtless the P. setacea b. lanosa Edmond- 

 ston. In grassy places on the Burrafirth cliffs is a form with 

 leaves, long, erect, and pale green. 



P. Coronopus L. Common ; always as the form with leaves 

 spread flat on the ground. * Var. pygmean Lange. Y. With the 

 similar form of P. maritima at Hamna Voe. 



C/tenopodiacece, Polygonacece. These I was obliged to neglect, 

 as they were, for the most part, in too early a state for determina- 

 tion. A dwarf form of Rumex acetosa (1-2 inches) occurs on the 

 top of Saxa Vord Hill. 



Salix cinerea L. " Var. (?) folia rugosa et dense subtus 

 pubescentia." Dr. Lange in litt. U. Between the Loch of 

 Cliff and Burrafirth in a boggy pasture. 



S. aurita L. U. Foot of cliffs, east side of the Loch of 

 Cliff. 



t S. ambigua Ehrh. U. With the last. 



S. repens L. U. Wick of Hagdale, near Baltasound, &c. 



Spargailium. The only forms seen belong clearly to the 

 affine group, but being only in flower are not determinable. 



Potamogeton natans L. U. Abundant in the Loch of 

 Cliff. N. Small loch between Ronas Voe and Hillswick. 



P. polygonifolius Poun. Common, chiefly as the var. 

 ericetorum Syme. Deep-water forms occur in a burn (N) between 

 Eela W T ater and Collafirth. A narrow-leaved state at Hilswick 

 " approaches var. a?igust if alius Fr." A. Bennett in litt. 



I P. heterophylhlS Schreb. L. Clickhimmin Loch. 



% P. nitens Weber var. curvifolius Hartm. U. North end 

 of the Loch of Cliff. Mr. Bennett thinks this probably the P. 

 lanceolatus Edmonst. P. lucens L. and P. crispus L. Not 

 seen. 



P. perfoliatus L. Loch of Cliff, as recorded by Tate, who 

 thinks it the P. lucens Edmondst. 



