Paeonia delavayi mostly has red brown to yellow, nodding flowers.
Paeonia delavayi is variable in the number and shape of the leaflets and in the number, size, and color of all parts of the flower both within and between populations. Paeonia lutea, P. potaninii, and P. trollioides are all regarded as synonyms of P. delavayi. P. lutea var. ludlowii was shown to differ in a number of characters and is now named Paeonia ludlowii.