Notable relict species include the endemic rhododendrons (Rhododendron caucasicum, R. ungernii, R. smirnowii) and Persian ironwood (Parrotia persica).    From Wordnik.com.  [Biological diversity in the Caucasus] Reference

Parrotia persica), which has a prominent place near the front porch.    From Wordnik.com.  [post-gazette.com - News] Reference

Parrotia.    From Wordnik.com.  [Latest Articles] Reference