The black poplar can be identified by its triangular leaves and spreading branches. Its catkin flowers are found on separate trees, with males being red and the females yellowy green. The flowers ...

The large flower buds burst open to expose the silky, silver-gray, furry catkins early in the spring before leaf emergence ...

Cullinan Studio, Turkington Martin and 10architect have collaborated to develop the Catkin Centre and Sunflower House for the Alder Hey Children's NHS Foundation Trust in Liverpool, United Kingdom.