2&2 The Scottish Naturalist. 



CUPULIFER^. 

 ccxlvi. Quercus Tourn. 



550. Robur L. Not very common in a native state. 



i. Sub-species sessilirlora Sm. Not uncommon. 

 it. Sub-species pedunculata Ehr. Less common. 



ccxlvii. Corylus Tourn. 



551. Avellana L. Common. 



BETULACE^E. 



ccxlvi 11. Betula Tourn. 



552. Alba L. 



/. Sub-species verrucosa Ehr. Commonest in the 

 Highlands. 



ii. Sub-species glutinosa Fr. Commonest in the Low- 

 lands. 



553. Nana L. Very local. 



cclxix. Alnus Tourn. 



554. Glutinosa L. Common. 



MYRIOAOB^S. 



ccl. Myrica L. 



555. Gale L. Common in the Highlands, rare in the Low- 



lands. 



CONIFERS. 



COLL PlNUS L. 



556. Sylvestris L. Native in several localities in the High- 



lands. 



cclii. Juniperus L. 



557. Communis L. Not uncommon, but local in the High- 



lands ; rare in the Lowlands. 

 Var. nana Willd. On the hills. 



ccliii. Taxus Tourn. 



558. Baccata L. The Fortingal yew, supposed to be the old- 



est (3500 years) tree in Europe, is, along with a younger 

 plant beside it, the only native representative of the 

 species now in Perthshire. 



HYDROCHARIDE^L 



ccliv. Stratiotes L. 



559. Aloides L. Rare, and only naturalised. 



