What does "parrot's bill" mean?

Two similar plants with showy flowers, the glory pea.

What is a synonym for "parrot's bill"?

Common synonyms include: clianthus puniceus, parrot's beak.

noun

noun ·Rare ·Advanced level

Noun

1
Two similar plants with showy flowers, the glory pea.
2
evergreen shrub with scarlet to white clawlike or beaklike flowers; New Zealand wordnet

From the resemblance of its curved superior petal to a parrot's bill.