Sub-species
subsp. formosa
This perennial is similar to the species with leaves that are glaucous beneath and produce purple pink, pink or white flowers. It is naturally found from the western slopes of Sierra Nevada, coastal ranges to central California and extending to British Columbia.

subsp.oregona
This perennial is similar to the species with leaves that are glaucous on both sides and produces cream to pale yellow flowers. It is founded in isolated region from south-western Oregon to north-western California.

Cultivars
'Langtrees'
This vigorous perennial has divided silvery-grey leaves up to 300 mm (1 ft) long and produces pink tinted white flowers up to 20 mm (ľ in) long. They are arranged in a raceme above the foliage appearing from spring to mid summer.

'Luxuriant'
This spreading perennial has divided deep green leaves up to 300 mm (1 ft) long and produces red flowers up to 25 mm (1 in) long. They are arranged in a raceme above the foliage appearing from spring to mid summer.

'Margaret Fish'
This perennial has divided bluish-grey green leaves up to 300 mm (1 ft) long and produces white flowers up to 20 mm (ľ in) long. They are arranged in a raceme above the foliage appearing from spring to mid summer.

'Quicksilver'
This spreading perennial has divided bluish-grey green leaves and produces pure white flowers up to 20 mm (ľ in) long. They are arranged in a raceme above the foliage appearing from spring to mid summer. This plant dislikes hot humid climates and full sun preferring a semi-shaded position.

'Snowflakes'
This perennial has divided mid-green leaves and produces white flowers up to 20 mm (ľ in) long. They are arranged in a raceme above the foliage appearing from spring to mid summer.

'Sweetheart'
This perennial has divided green leaves and produces white flowers up to 20 mm (ľ in) long. They are arranged in a raceme above the foliage appearing from spring to mid summer.

Hybrids
Adrian Bloom'
This hybrid was derived from a seedling of 'Bountiful' with bluish green foliage and produces dark pink flowers from spring to early summer.

'Aurora'
This hybrid was derived from D. formosax D. eximiawith grey-green foliage and produces pure white flowers from spring to early summer and is tolerant of hot humid climates.

'Bountiful'
This hybrid was derived fromD. formosasubsp.oreganax D. eximiawith bluish-green foliage and produces rosy-red flowers from spring to early summer.

'Gothenburg'
This hybrid has a compact habit and was derived fromD. formosasubsp.oreganax D. peregrina f. alba with green foliage and produces light-pink flowers from spring to early summer.

'King of Hearts'
This hybrid was derived fromD. peregrinax (D. formosasubsp.oreganax D. eximia) with bluish-grey green foliage and produces pink flowers from spring to early summer.

'Silversmith'
This hybrid was derived fromD. formosasubsp.oreganax D. eximia with green foliage and produces pink-tinted white flowers from spring to early summer.

'Stuart Boothman'
This hybrid was derived fromD. formosasubsp.oreganax D. eximia with grey-green foliage and produces deep pink flowers from spring to early summer.