Diadelphous stamens are found in:
China Rose
Citrus
Pea
Chia rose and citrus
Monadelphous stamens are seen in china rose, these stamens have a single bunch of filaments.
The plants in which the stamen or anthers are present in three or more than three bundles are known as polyadelphous stamen. This type of arrangement is commonly observed in citrus fruits like lemon.
Diadelphous stamens are found in pea, having united filaments so that they are arranged in two groups.