Feathery Cassia

"Senna artemisioides is a woody shrub to 3 meters tall with a silvery appearance created by short white hairs on the branchlets and leaves. The leaves are pinnate with 4-8 pairs of leaflets. There are nine subspecies currently recognized. The form most commonly seen in gardens (subsp. artemisioides) is usually smaller - about 1.5 meters tall - and was previously known as Cassia artemisioides). The pinnate leaves of this form are about 2-4cm long and are narrowly cylindrical, grey-green or silvery, 1-4 cm x 0.2-0.3 cm."

Source: here

"It is well known that this gorgeous foliage color is an evolved adaptation to withstand solar radiation and slow down transpiration."

Source: here