Mixed Ecologies

"Woodlots were the deep green of Terran oak and the orange-green of Kzin, tall frondlike growths in Wunderland's reddish ocher."
-Jerry Pournelle and SM Stirling, "The Hall of the Mountain King" IN Larry Niven, Ed., Man-Kzin Wars V (New York, 1992), pp. 5-202 AT p. 38.

Human colonists and kzinti conquerors have imported trees to the Alpha Centaurian planet of Wunderland. Thus, the vegetation is green, orange and red.

For similar scenes on the human-Ythrian colony planet of Avalon, see here, then follow the link to a post on the human colony planet of Aeneas. On Nike (see also here), there is blue-tinted pale green native vegetation but:

"Otherwise, the country had been taken over by the more efficient, highly developed species that man commonly brought with him."
-Poul Anderson, Flandry's Legacy (New York, 2012), p. 484.

These are:

oak;
birch;
primrose;
grass overwhelming pseudo-moss that thrives only in shade.

On Lokon:

"Clover was another of those life forms that man had brought with him from Old Earth, to more planets than anyone now remembered..." (Flandry's Legacy, pp. 665-666)

However, either the life forms adapt to alien environments or genetic drift changes them at random. Thus, they are often unrecognizable, as humanity must eventually become. We think of man the conqueror but it seems that we should add oak, grass, clover etc to the list.