78 LAWSON — MOKOGEAPH OP EKICACEJE. 



have been previously described ; they will probably be viewed as 

 presenting a case of development, the peculiar structures commen- 

 cing in our Nova Scotian G. procumbens, where they are confined 

 to the margins of the leaves, developing, as an intermediate stage, 

 in G.'Shallon, where their rudiments appear on the lower surface 

 of the leaf likewise, and finally acquiring completeness in G, 

 ovalifolia, in which the whole under surface and margins are pro- 

 vided with them in the most highly developed form. 



G. Shall on does not come eastward more than a hundred miles 

 from the Pacific Coast. Cassandra calyculata abounds in every 

 swamp about Halifax, and is not rare throughout the Dominion ; in 

 the far north it becomes more scaly. Andromeda polifolia grows in 

 Newfoundland, Labrador, Anticosti, but is chiefly a northern spe- 

 cies, extending to the arctic shores, and often bearing the black 

 blotches of Ehytisma Andromedas, observable on the cultivated 

 plant in European gardens. A. tetragona is an extremely arctic 

 species, forming a turf, which affords a scanty fuel to voyagers in 

 the most desolate regions ; it grows on all the arctic shores of the 

 old and new world. A hypnoides, which occurs on the White 

 Mountains and Labrador, is one of our rarest plants. Kalmia 

 glauca is chiefly confined to the maritime Provinces, and probably 

 does not produce its flowers in Ontario. It was known to Euro- 

 pean Botanists long before being described in Hortus Kewensis ; it 

 is the K. linearifolia, Menzies, who found it last century '' in palu- 

 dibus juxta Halifax, Nova Scotia ;" and specimens collected by 

 Sarrazin nearly two hundred years ago were found by Smith in 

 1786, in the then old Herbarium of Valliant at Paris. K. angus- 

 tifolia is one of the handsomest plants of our Nova Scotian barrens, 

 and seems to thrive best in the poorest soils, where it has plenty of 

 moisture, exhibiting with us a very different appearance from that 

 which it presents in inland localities. K. latifolla has been record- 

 ed by Sir John Richardson, Mr. Billings and others, as Canadian, 

 but there is no evidence of its existence within our limits. Khodo- 

 dendron Canadense is an Atlantic plant, especially abundant in 

 Nova Scotia, where Colonel Hardy has found a variety with pure 

 white flowers. R. Lapponicum is chiefly of northern range. R. 

 maximum is not known within our limits, although Gray says it is 



