304 MONGECIA TETRANDR1A. 



III. TETRANDRIA. 



26 4 8. LITTORELLA. 



1. L. lacustris, stemless; leaves linear, fleshy, semicylindrical. 

 about 2 inches long; barren flowers on simple stalks, 2 or 3 

 inches high, with very long filaments; fertile flowers sessile. 

 Plantain Shore-weed. 



Hal. Margins of the Lough on Holy Island abundant. 

 Coldingham Lough ? June. 7/ 



269. ALNUS. 



1. A. glutinosa, leaves roundish-wedge-shaped, wavy, serrated, 

 glutinous, rather abrupt, downy at the branching of the veins 

 fceneath. Common Alder. 



Hal. Wet and boggy grounds. May. fj 



The bark and leaves of this common and unattractive tree 

 are employed in dyeing, in tanning leather, and for stain- 

 ing fishermen's nets, their astringent quality adapting 

 them for these uses. The value of the bark is also well 

 known to our calico-printers; and it might be used to 

 great advantage as an excellent substitute for many 

 woods used in dyeing, which we have from abroad, and 

 on which we expend considerable sums. The wood is 

 chiefly valuable from its property of remaining long 

 sound under water; whence it is used for water-pipes, 

 and for piles to be driven into the ground in order to 

 support buildings in boggy situations. Clogs and pattens 

 are also principally made of it ; and with it the High- 

 landers are said to make chairs, which are very handsome, 

 and have the colour of mahogany. 



270. URTICA. 



1. U. urens, leaves opposite, elliptical, with about 5 longitudi- 

 nal ribs ; clusters nearly simple. Small Nettle. 



Hal. Waste places. June Oct. 



