What do the letters K,C,A,G represent is identifying the plant by it flowers?
K = calyx, the sepals; also symbolized Ca C = corolla, the petals; also symbolized Co A = androecium, the stamens; also symbolized S G = gynoecium, the pistil(s) These are shorthand symbols used to write a floral formula, which tells you about the construction of the flower. For instance, a tulip flower has the floral formula Ca 3 Co 3 S 6 G 3 (with a circle around the 3 of the G to symbolize three united carpels) The infinity symbol is used for “many”, which is defined as “more than 10” — so poppy stamens are symbolized as S infinity, for instance. If you poke around on the web using the search term “floral formula” you’ll find some examples written properly, as I cannot write them here.