6 <br /> Lomatium bradshawii take precedence over narcissus and tulips in <br /> our yards? Should Oregon oak displace trees of colorful charm like <br /> crabapples and Florida dogwoods in the spring and sugar maples in <br /> the fall? Of course not! <br /> 6 Is the Foundation's promoting of native trees a matter of <br /> ecological concerns? Who can say that there are any endangered <br /> native tree species that need protection on our city streets. Is <br /> there any danger that Eugene's approved street tree list will ever <br /> include cultivars that would threaten to overrun the native <br /> species? No, it is difficult to see the relevance of this issue to <br /> the catechism of ecology. <br />