DENDROLOGY

Detailed explanation-1: -In Australian Acacia, the leaves are small and short-lived. Hence in these plants, the petioles are modified. They expand and become green and perform photosynthesis. These modified petioles capable of performing photosynthesis and synthesizing food are called phyllodes.

Detailed explanation-2: -In Australian Acacia, the leaves are small and short-lived. Hence, in these plants, the petioles are modified. They expand, become green and perform photosynthesis. These modified petioles capable of performing photosynthesis and synthesising food are called phyllodes.

Detailed explanation-3: -Opuntia and Euphorbia are characterised by phylloclade while Asparagus by cladode.

Detailed explanation-4: -Option C-Australian Acacia: Phyllode is found in genus Acacia commonly. It is also Australian Acacia called phyllodia. In Australian species it is common so we have the answer.