The phyllotaxy in which two leaves arise from a bud at each node is

Explain with suitable examples the different types of phyllotaxy.

$A$ long, thin, flexible $petiole$ allows leaf blades to flutter in wind, thereby cooling the leaf and bringing fresh air to leaf surfaces.

Unicostate venation is also known as:

In $Acacia$ species,the first few leaves are pinnately compound. Then there are leaves with flattened petiole and fewer pinnae. The leaves of the adult plant have parallel-veined flattened petioles and no pinnae. It shows that:

Unifoliate compound leaf is found in