Structure and development of stomata in some Buddlejaceae

The organs investigated may be hypo‐ or amphi‐stomatic. The epidermal cells are either polygonal, isodiametric or elongated and irregular with mostly straight, occasionally arched and rarely sinuous anticlinal walls. The epidermal cells may be arranged either uniformly or in vertical rows or without any definite pattern. The mature stomata are either anomocytic, anisocytic, paracytic, with a single subsidiary cell or transitional between paracytic and diacytic. Arrested development and cytoplasmic connections between adjacent stomata are also observed. The development of anomocytic type is haplocheilic or perigenous while that of the other types is syndetocheilic or mesogenous. Taxonomic significance is also discussed.