PERSONALITY OF PLANTS 
and nearly as many have established themselves 
in the eastern United States. 
Some plants seem to be able to adapt them- 
selves to any climate and therefore are born 
explorers, but the greater number are too fas- 
tidious regarding conditions of soil, heat, light 
and moisture to thrive well everywhere. It 
is a noticeable fact that the most successful 
plant invaders usually come in the wake cf hu- 
man colonizers and stick to the sphere of man’s 
influence. For example, the Butter-and-Eggs 
(Linaria Linaria) has followed the railroad 
tracks almost entirely over the tropical and 
semi-tropical world. Sometimes, however, 
hardy plants advance into the primeval jungle, 
there to give battle to its lusty inhabitants. 
On the whole, annuals have a better chance 
than perennials to gain a foothold in a new 
country. Every spring the weeds, grasses, and 
common flowering plants have to start all over 
again from a seed beginning. ‘The spores of 
newcomers, therefore, have almost an equal 
chance with the established inhabitants. On 
the other hand, the bodies of perennials occupy 
the land in close-packed ranks all the year, 
[so] 
