The spectra of morphological features for vegetative organs of three closely related families, Capparaceae, Cleomaceae and Brassicaceae s. str. or Brassicaceae s. l. (alternative view), were investigated. The following characters were considered: life-forms, diversity of trichomes, stem orientation, phyllotaxis and leaf type, edge of leaf blade, presence/absence and form of stipules, presence/absence of heterophylly, and duration of growing season. For each family, the most common (typical), rare, and not represented features were defined. The rare or not represented characters are as follows: for the family Capparaceae, metamorphosed shoots and compound leaves (first), glandular structures and heterophylly (second); for Cleomaceae, respectively, tree life-form, evergreen leaves, rosette monocarpic and plagiotropic shoots (first), simple trichomes and heterophylly (second); for Brassicaceae s. str., accordingly, tree life-form, herbaceous aquatics, metamorphosed and convolved shoots, glandular structures, whorled phyllotaxis, evergreen and compound leaves, modified stipules (first), simple multicellular hairs (second). The spectra of the studied morphological features of these three families partly overlap, and the most common (typical) and rare characters are not identical. The data obtained allow to consider the principal trends of morphological evolution of vegetative organs in the Brassicaceae s. l. It is suggested that intensification of the growth and development (neoteny), reduction process (abbreviation) and changes of the development course (deviation) resulted from adaptation of the ancestral types to seasonally dry environment in the tropics and subtropics (Cleomaceae) and to continental climate of the temperate zone (Brassicaceae s. str.). Distinct features of high specialization in modern Brassicaceae s. str. allow colonization of not only xerophilic but also cryophilic habitats.

Keywords: Capparaceae, Cleomaceae, Brassicaceae, life forms, vegetative organs, pubescence, heterophylly

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