The increase of morphological and physiological autonomy with the Volvocales
The transition to multicellularity in early evolution led to an emancipation from the environment and to an in... read more
Streptocarpus with a brood leaf
In the genus Streptocarpus (Gesneriaceae) the usual generation of new leaves on the shoot is more or less replaced by a generation of new leaf parts on the... read more
Correlation of the shapes of the shoot and leaf of annual dicotyledons
That the shape of a plant changes qualitatively and quantitatively during growth was noted as early as Aristotle. He... read more
Concerning the evolutionary development of the blossom and fruit of the Ranunculaeeae
The fruit formation of the Ranunculaceae - evolutionarily early representatives of the angiosperms - ... read more
The native species of the genus Hypericum compared
In Middle Europe the genus Hypericum is divided into six sections systemizing ten Hypericnm species according to morphological character... read more