292 Agriculture and Horticulture in New Zealand. ; e 
3. Failure of species to become established. 
Most instructive from the phytogeographical standpoint is the apparent 
'inability of many species to establish themselves although apparently most % 
suitable for the purpose. A few examples only can be cited. Papaver rhoeas, 
in various forms, has been cultivated for many years throughout the Dominion 
‚and yet it has never become established as a farm-weed. No species ever a 
escaped from my experimental garden near New Brighton where hundreds of 
plants well suited for dispersal were cultivated and where there was waste 
land in plenty offering stations of many kinds. Nothing is more common 
than for the refuse from: weeding a flower-garden to be cast on to roadsides 
| in the country and yet the number of species that are so established are 
negligable.. And the converse is also true that species rarely enter a garden 
‘from without, and when this does happen such are most likely indigenous 
plants such as Preridium, Cordyline australis or Cöprosma profpingua. 
u. Eveh muge. the seeds of certain aliens are sown regularly as impurities 
in agricultural ‚seeds the species have never been recorded from any part of 
New Zealand. There are at least 32 species of this kind, according to a list 
an. drawn up for me An the fee the Be off 
