Plant 1

 

Caption: The first plant featured in the Voynich Manuscript, downloaded from Yale University's archive.

Twelve of the twenty-sex leaves are yellow. The other fourteen are green. The flower has three discernible petals, with either a brown center or a brown fruit already forming.

No presently known plants have both yellow and green leaves. Perhaps the (about) half yellow leaves are a way of communicating that the plant is half dead, dying of dehydration.

I googled "white flowers with brown fruit", and came up with three options: boysenberry, jostaberry, and callery pear (a.k.a. the Bradford pear).

The jostaberry, I ruled out, because its leaves are tri-lobed, and its flowers are red.

The boysenberry is a closer match, but the edges of its leaves are jagged, and it was first created in 1920's California as a hybrid.

The closest of the three is the callery pear, which is native to China and Vietnam. It has a purported bad taste, but it produces white flowers with white and brown buds.