Full resolution (JPEG) - On this page / på denna sida - First part - I. Physical Geography - 4. Vegetation. By Lector A. Nilsson, Ph. D., Institute of Forestry, Stockholm
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THE VEGETATION.
59
thick masses of deep-sea tangle (Laminaria saccharins Lamour. [sugar-wrack]) and
digitate Lamour.); and to the lowest region — the elitoral region — red
seaweeds <floridese) give a peculiar character. Laminaria cannot stand the less
saltish water of the Baltic, and also the red sea-weeds are strongly diminishing
towards the north of the Baltic, where the elitoral region does not exist. The
green sea-weeds, on the contrary, often form a green covering of the rocks near
the surface of the water, and the above mentioned high-grassbelt often
characterizes shallow, land-locked bays.
At the Mill-pool. Rättvik in Dalarne. photo- Gösta flobka»,
Stockholm,
The flora of Sweden consists of about 1,600 species of wild
flowering plants (this number not including about 150 introduced species),
whereof a.bout 1,050 are found in Skåne, 680 in Helsingland, 510 in
the province of Vesterbotten, and 190 in the alpine region of Lappland.
Host of the species are more or less widely spread also beyond
Sweden. Endemic, that is, in our country exclusively appearing and here
evolved forms are ordinarily not enough distinguished to be considered
as species, but are regarded as subspecies or varieties and are to be
found especially in varying genera, particularly Hieracium, of which
genus (according to Dahlstedt) about 700 to Sweden endemic subspecies
hitherto are described.
The changes of the climate in different seasons naturally has
great influence on the vegetation. The proper vegetation period, being
limited to the warmer part of the year, diminishes in length towards
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