Buds arise from meristem tissue.
Ultimately, at maturity, no localized meristem remains.
The shoot apical meristem provides cells for organs such as leaves and flowers, while the root apical meristem gives rise to cells for root growth.
Another type of meristem active in certain plants, especially grasses, is the intercalary meristem.
The region of cell division includes the apical meristem and the primary meristems the protoderm, ground meristem, and procambium derived from the apical meristem.
The new root meristem has been named Radix carbonica, and has features in the way in which the cells are organised that distinguish it from any other known root meristem, past or present.
And sure enough, if you quantify the distribution of different cell sizes, an active meristem can be recognised.
The upper portion of the buttress develops a meristem on the side facing the stem (adaxial meristem).
Such stems, termed pachycaulous, result as in palms from activity of a primary thickening meristem (PTM) lateral to the apical meristem, which produces much greater increments of cortical parenchyma than would result if only an apical meristem were present.
This primary growth is derived from a primary-thickening meristem under the leaf bases that is a lateral continuation of the apical meristem.
BM: branch meristem; SM: spikelet meristem; FM: floret meristem.
