1892.] Noteworthy Systematic and Distributional Researches. 221 
species of Atriplex, Senecio viscosus, Salicornia and the 
variety salina of Matricaria inodora. The perennials are 
and Petasites spuria. Only a few perennial herbs without 
creeping rhizomes are recorded from this locality, such as 
Crambe, Eryngium and Mertensia, all of the species 
“maritima.” 
What the author has called the ‘‘Psamma-formation,” the 
second zone, includes the vegetation of the dunes which are 
most typically developed along the coast, where they give 
the landscape its very singular appearance. They are barren 
hills exposed to raging storms, and with a vegetation always 
very poor and monotonous. The plants must be able to re- 
sist a living burial in the moving sands. But as a matter of 
fact the formation of these dunes is actually due to their 
growth. Psamma, Elymus and Triticum make the founda- 
» Or, in some cases, by Hippophaé, and the 
: of Psamma gradually dies out. 
It is stated that a single tuft of Psamma has caused the 
ae dune about twenty meters high. _ This plant 
Be erefore, better fitted for resisting sand burial than any 
oh Tt not only does not hurt it to be covered entirely by 
h sand; its growth seems really stimulated, the ascending 
‘oots stretching themselves so as to reach the surface and 
€ sunlight, 
the mus arenarius is also a valuable plant for making stable 
sand, although it is not nearly so important as Psamma, 
does not seem to thrive well before the sand has been 
of Tri pe retion, namely, Festuca arenaria and some species 
um. Th 
thamnoides, thriy 
Nd due €speci . i 
eee i t-shoots. 
© roots f, y to its rapid propagation by roo 
M., develo 
The thir 
