botany, phytology - the branch of biology that studies plants

arrangement - an orderly grouping (of things or persons) considered as a unit; the result of arranging; "a flower arrangement"

foliage, leaf, leafage - the main organ of photosynthesis and transpiration in higher plants

system - a group of physiologically or anatomically related organs or parts; "the body has a system of organs for digestion"

cardiovascular system, circulatory system - the organs and tissues involved in circulating blood and lymph through the body

zoological science, zoology - the branch of biology that studies animals