There is a kind of flower. The flowers on the branches are as lifelike as butterflies. What kind of flower is this?

It should be Phalaenopsis

Phalaenopsis (scientific name: Phalaenopsis H.G. Reichenbach) belongs to Phalaenopsis of Orchidaceae, with 3-4 or more leaves, oval or sickle-shaped, 10-20cm long and 3-6 cm wide; Scape 50 cm long, peduncle 4-5 mm in diameter, inflorescence axis slightly folded back; The middle sepal is nearly oval, about 3 cm long, with a slightly narrow base, and the lateral sepals are obliquely oval, and the base is attached to the pistil foot; Petals are rhombic and round, with red spots or fine lines, middle lobes are rhombic, and there are yellow fleshy protrusions at the base: the pistil is about 1 cm long and wide enough; Each pollen mass splits into two parts with different sizes.

China, Thailand, Philippines, Malaysia and Indonesia. Born on the trunk of a tropical and subtropical low-altitude jungle.

Look at this and see if it is consistent with what you remember.

Or this

It's called Ugandan alder.