2 
Examples of the more northern wild plants that e end t their 
active annual existence, regardless of seasonable variations from 
year to year oO i 
istence 1 
yee regal of meteorological <atiations that seem decid- 
edly marked to us 
The amare a this seasonal change, of course, varies with 
latitude. pics it is eon conspicuous; often, indeed, 
although vegetation is legion, variation is nil. In temperate 
regions it is most c conspicuous ; while at the poles, for the lack 
of o monly cult ivated plants, whether they were 
serail ne fe or from low latitudes, are much less regular 
in their seasonal habits. We are familiar with cultivated 
plants whose behavior is governed not so much the seasons, 
except t yth is impossible in freezing weather, as 
irregularities of conditions in the growing 
, pansies (Viola), sweet-alyssu Koniga), 
portulaca (Portulaca), and dahlias (Dahlia), in a temperate 
egion, ourish well into a prol n or 1 
or die down to the underground parts regardless of the pro- 
longed warm weather 
Grasses, also, often furnish conspicuous examples of this 
phenomenon. In the winter we may ace = notice a field 
or a hillside covered with a native grass, brown and apparently 
lifeless, while nearby a lawn planted ae some fee grass 
This rule obtains not only among ornamental plants, but 
by ma 
among annuals, biennials, and syria Thus, sheep-sorrel 
(Rumex Acetosella), chickweed (Alsin dia), pepper-grass 
(Lepidium virginicum), none-such (Nedicawo Lupulina), wood- 
