Idea:

This tree is somewhat different from the one earlier discussed (two glyphs to the left).

For the moment I have no good idea about why. Instead I want to document an idea which relates to both these glyphs:

This type of glyph is not really a tree, they were so scarce on Easter Island. This type of glyph instead is showing ginger.

On Easter Island ginger was called kava, a name elsewhere in Polynesia used for a refreshing (or stupefying depending on how it was used) drink, made with preparations including chewing, letting the salivatory glands deliver fluid as a necessary ingredient.

(Reference: Barthel)

Perhaps we may compare the Polynesian ceremony of kava drinking, and its equivalent ginger variant on Easter Island, with the Japanese tea ceremony?