FIGURE 4.

Division patterns in stomata. Divisions outlined left (youngest cells) to right (oldest cells). GMC and guard cells are cyan; subsidiary cells are pink or orange; other cells are green. (A) Amplified anisocytic divisions. This type of division is common among eudicots such as Arabidopsis thaliana. (B) Helicocytic divisions. This type of stomatal complex is seen in some eudicots such as begonia. (C) Gramineous (grass) divisions. Paracytic divisions, as seen in other monocots like lily or Tradescantia virginiana, follow the same pattern but have kidney shaped guard cells rather than the dumbbell shaped guard cells characteristic of grasses. (D) Two possible patterns of hexacytic stomatal generation. The generation of lateral subsidiaries is identical, however in the upper panel the cell closest to the GMC divides, while in the lower panel the cell distal from the GMC divides. (E) Tetracytic divisions in Agave spp. and some other monocots and feature unusual oblique divisions in the formation of the lateral subsidiary cells. (F) Recruitment of subsidiary cells in cyclocytic gingko.