K is for……

Kasicarpa
The fossil genus Kasicarpa is known from fruit, flowers and leaves from the Chulym-Yeni-Sey depression in western Siberia.
Unusually it shows characteristics of 2 unrelated families of plants, the Platanaceae (Planes) in the Proteales and the Hamamelidaceae (Witchhazels) in the Saxifrageales.
When originally discovered scientist found the fruit easily placed in the Platanaceae and the leaves were originally described as Popullites pseudoplatanoides (a poplar that looked like a plane). This all caused a bit of confusion but has since shown a relationship between the two extant families with members of the sub family Altingioideae (liquidambar family) in the hamamelidaceae being most similar.