Alstroemeria pulchella is a synonym for several species of Alstroemeria.

Alstroemeria pulchella H.Vilm. -> Alstroemeria aurea Graham

Alstroemeria pulchella Sims -> Alstroemeria ligtu subsp. simsii (Spreng.) Ehr.Bayer

Alstroemeria pulchella L.f. -> Alstroemeria pelegrina L.

But in horticulture and many countries the name Alstroemeria pulchella is used fot Alstroemeria psittacina.

All observations of Alstroemeria pulchella on iNaturalist so far are actually Alstroemeria psittacina.