(A) The complete floral formula of the family $Fabaceae$ is: $\% \, \text{K}_{(5)} \, \text{C}_{1+2+(2)} \, \text{A}_{(9)+1} \, \underline{\text{G}}_{1}$.
The floral characteristics of the $Fabaceae$ family are as follows:
$1$. Symmetry: Zygomorphic $(\%)$.
$2$. Sex: Bisexual $(\%)$.
$3$. Calyx $(K)$: $5$ sepals,gamosepalous (fused),represented as $K_{(5)}$.
$4$. Corolla $(C)$: $5$ petals,polypetalous,papilionaceous aestivation (vexillary),consisting of one posterior standard,two lateral wings,and two anterior petals forming a keel,represented as $C_{1+2+(2)}$.
$5$. Androecium $(A)$: $10$ stamens,diadelphous $(9+1)$,represented as $A_{(9)+1}$.
$6$. Gynoecium $(G)$: Monocarpellary,ovary superior,unilocular with many ovules,represented as $\underline{G}_{1}$.