The aestivation of petals in the family $Malvaceae$ is ......

In which of the following families are the stamens concealed within the keel,a condition known as cleistostemonous?

Persistent calyx is a characteristic of

Family $Fabaceae$ differs from $Solanaceae$ and $Liliaceae$. With respect to the stamens,pick out the characteristics specific to family $Fabaceae$ but not found in $Solanaceae$ or $Liliaceae$.

Ray florets have:

The perianth in the family $Gramineae$ (Poaceae) is called ..........