Ontogeny of the flowers in Paulownia tomentosa - A contribution to the recognition of the resurrected monogeneric family Paulowniaceae

When continuing to resolve and stabilize the relationships of clades, it should be one of the goals to find new, visually perceptible data that enable easy identification of clades. For Paulowniaceae, these distinctive characters are the peculiar shape of the multi-winged seeds with their lateral wings gradually increasing in size and the tubular stigma with papillae inside a dilated chamber.