Leafless stem of onion which produces cluster of terminal flowers is called as

Compound apocarpous gynoecium is found in

In Amorphophallus and Colocasia $(Ariods)$ an extremely enlarged underground vertical stem meant for vegetative reproduction and storage is

The layer which separates velamen (A spongy tissue in epiphytic roots of some orchids for absorption of atmospheric moisture) from cortex is called

Floral formula of Caesalpinoideae is