Paradisea liliastrum is a perennial that bears scented white flowers in May to June. It originates from the Pyrenees, Alps and Apennines. Plant in full sun or partial shade on moist, well-drained loamy soil with a neutral to alkaline pH; rated H7 (fully hardy) for UK conditions.

St Bruno's lily (Paradisea liliastrum) bears scented white flowers in May to June and prefers moist, well-drained loamy soil in sun or partial shade.

https://en.wikipedia.org/wiki/Paradisea_liliastrum

Paradisea is a European genus of flowering plants in the family Asparagaceae. It was formerly classified in the family Anthericaceae or earlier in the Liliaceae.

Paradisea liliastrum

St Bruno's lily (Paradisea liliastrum) | May-June blooms

Paradisea lusitanica is a perennial from Portugal and Spain that produces fragrant flowers in May to June. It prefers a position in full sun to partial shade and suits moist, well-drained soil. In a UK garden it works well in borders where its late-spring scent can be enjoyed close to paths or seating.

Portuguese Paradisea (Paradisea lusitanica) is a perennial that bears fragrant flowers in May to June and prefers full sun to partial shade with moist.