How many plants among Indigofera, Sesbania, Salvia, Allium, Aloe, mustard, groundnut, radish, gram and turnip have stamens with different lengths in their flowers?

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Correct answer: B. Four

Mustard, Radish, and Turnip belong to family Brassicaceae, have stamens with different lengths in their flowers with androecium arrangement $\to {A}_{2 + 4}$ .
Salvia belongs to family Lamiaceae, have stamens with different lengths in their flowers with androecium arrangement $\to {A}_{2 + 2}$ .
Indigofera, Sesbania and gram belong to the Fabaceae family. Androecium in them is usually 10 stamens, filaments may be distinct or all united into a tube Monadelphous, or 9 united into a strap with one filament free diadelphous.

Allium and Aloe belong to the Liliaceae family. Androecium in them is polyandrous, epiphyllous, antiphyllous, filaments long, anthers versatile or basifixed, dithecous condition.

How many plants among Indigofera, Sesbania, Salvia, Allium, Aloe,...

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