To which family does $Althaea rosea$ belong?

The condition of stamens in the $Cruciferae$ family is correctly expressed as:

Which of the following members of family-Solanaceae is a rich source of vitamin-$C$?

In the Bentham and Hooker system of classification, the position of certain families like Ceratophyllaceae, Callitrichaceae, and Empetraceae is uncertain, and these unrelated families are placed in a group called "Ordines anomali". This group is included in:

Pollinia is found in which of the following plant families?

Most of the fibers are obtained from the members of which family?