Populus caspica

Caspian poplar is in the willow or Salicaceae family and is native from the Caucasus to the western Himalayas, including Georgia, Azerbaijan, Iran, Afghanistan and Pakistan.

It also is sometimes referred to as P. alba var. caspica and resembles white poplar in numerous leaf and bark characteristics, although a detailed description could not be found online.

• Leaves are 4–15 cm long, five-lobed, with a thick covering of white down on both sides but thicker underneath; this layer wears off the upper side but not the lower, which stays white until autumn leaf fall. Small branches also are white.
• Flowers are catkins up to 8 cm long, produced in early spring; they are dioecious (male and female catkins on separate trees); the male catkins are grey with conspicuous dark red stamens, the female catkins are greyish-green.
• Bark has characteristic diamond-shaped dark marks on young trees, becoming blackish and fissured at the base of old trees.