The trend of the evolution of the plant kingdom has been in the direction of the establishment of a vegetation of fixed habit and adapted to the vicissitudes of a life on land, and the Angiosperms are the highest expression of this evolution and constitute the dominant vegetation of the earth's surface at the present epoch.
The flower is a characteristic feature of the highest group of the plant kingdom - the flowering plants (Phanerogams) - and is the name given to the association of organs, more or less leaf-like in form, which are concerned with the production of the fruit or seed.
Thallophyta.The simplest members of both the Algae and the Fungi (q.v.) (the two divisions of the Thailophyta, which is the lowest of the four great groups into which the plant-kingdom is divided) have their bodies each composed of a single cell.
Yeast comes from fungi, and fungi are part of the plant kingdom.
Dark leafy greens are the superheroes of the plant kingdom and we recommend a liberal amount of them.