Patterns associated with phyllotaxis are: pseudowhorls; primary vasculature; and wing pattern. Pseudowhorl pattern is imposed on the arrangement of leaf primordia and results from the selective internode elongation. Pseudowhorl is a group of successively initiated leaves, all positioned at almost the same level. Adjacent pseudowhorls are separated by a fully elongated internode. Number of leaves in a pseudowhorl depends on the quality of phyllotaxis, but also on the relation of leaf primordia size to the size of an apex dome, i.e. primordia packing. When primordia are large, as in Anagallis arvensis, this number equals the number of primordia on one revolution of ontogenetic spiral. When they are small, their number increases to a bigger member of the phyllotactic series, like in Peperomia verticillata. In this particular species even when phyllotaxis is truly whorled only every second internode elongates. It results in the formation of pseudowhorls composed of leaves belonging to two adjacent whorls. Another pattern closely related both to the quality of phyllotaxis and to primordia packing is the pattern of vascular sympodia. In primary vasculature of Anagallis shoots, their number is defined for each particular leaf distribution but the number of bundles composing individual sympodia is influenced by the local variation in circumferential spacing of leaves. This in turn is especially variable when phyllotaxis changes. The last pattern - formed by wings on the stem surface, at first sight seems to be the simple derivative of leaf primordia arrangement and elongation of internodes: wings are continuous with margins of leaf blades. In Anagallis however, wing pattern is to some extent autonomous. Wings not connected with any leaf are often formed on the shoot surface between the most widely separated leaves.

Key words: Anagallis arvensis, Peperomia verticillata, phyllotaxis, primary vasculature, pseudowhorls, stem wings