Abstract
The structure and ontogeny of stomata on the vegetative and floral organs in nine species ofVerbena are described. The data on stomatal index, density and size and epidermal cell density and size are also tabulated. Nine types of stomata occur side by side on the same surface in different combinations. The stomatal ontogeny is mesogenous, mesoperigenous and perigenous. Stomata with common subsidiary cells, cytoplasmic connections, cuticular striations, unequal guard cells, one guard cell and contiguous stomata are but sparingly observed. An increase in the number of subsidiary cells takes place by wall formation or the neighbouring perigenes assuming their shapes. Epidermal cells with inward projections are observed in the limb region of petals in all species. The taxonomic significance of stomata is also indicated.
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