How many cells are there in the apical meristematic tissue?
Looking at this picture...
, I would tend to think that there are few hundreds cells in the meristem tissue. But I guess this is a picture of a root tip and the answer will be much different if we look at big branches and big trunks of roots. Also, the answer will probably differ between monocots and eudicots.
Roughly speaking, how many cells are there in different apical meristematic tissues (root, branches, trunk, different species)?