Quercus castaneifolia

The chestnut-leaved oak , in the turkey oak group (Cerris) (with bristles on the cap of the acorn), in the beech or Fagaceae family, is an Asian species of oak native the Caucasus and Alborz Mountains of Iran. It is closely related to turkey oak (Q. cerris).

• Leaves are deciduous, alternate, simple, narrow oblong, chestnut-like, 10–20 cm long and 3–5 cm wide, with 10–15 small saw-tooth-like triangular lobes on each side. The foliage turns yellow very late in autumn, the dried leaves persisting on the tree through winter.
• Species is monoecious. Male flowers are yellow-green drooping catkins up to 10 cm long, female catkins are on spikes.
• Fruit is an oval acorn up to 3 cm long and 1.5–2.0 cm across, bicoloured with an orange basal half grading to a green-brown tip; the acorn cup is 2 cm deep and densely covered in soft 4–8 mm long bristles; acorns ripen after 2 years.