The butterfly on the right is a Female Cloudless Sulphur Butterfly. She lays her eggs on Cassia, so we call Cassia plants the host plants for these butterflies.

The white pointy spots are butterfly eggs on Cassia Alata. I had both Orange-barred and Cloudless Sulphur Butterfly Caterpillars on the plant, so I can only say that they're sulphur butterfly eggs.

The egg in this photo  is the tiny yellowish-white dot at the tip of the Cassia Alata leaf:

I can tell the caterpillars apart now, so here are Cloudless Sulphur Butterfly Caterpillars at various ages in their greenish and yellowish forms.

The caterpillars are more green if they eat the green leaves, and more yellow if they eat the yellow flowers. How's that for an example of the old saying, "You are what you eat?"