Pinus pumila × P. sibirica

Pinus pumila × P. sibirica is a putative hybrid of Japanese stone pine (P. pumila) and Siberian pine (P. sibirica).

[1] Pinus pumila × P. sibirica is a small tree about 4 metres (13 feet) tall with a broad open crown, and dark brown bark.

Once the tree reaches a height of 4–5 m (rarely 6–7 m and higher) damage to the branches becomes inevitable.

[1] Pinus pumila × P. sibirica naturally occurs in the Baikal region of Siberia (Russia) where P. pumila and P. sibirica ranges overlap, that is Irkutsk Oblast, some parts of Yakutia and Buryatia.

In the depression near Chortovo Lake (51°29'N 103°35'E), the Pinus pumila × P. sibirica trees possess the intermediate traits compared with parental species, whereas on the slopes, they acquire a creeping form and can only be distinguished from P. pumila by their large, purple cones.

Japanese stone pine cone (Pinus pumila) (left) and Japanese stone pine × Siberian pine cone (Pinus pumila × P. sibirica) (right). Anatomy of the cones and visible morphological differences in the hybridized cone. The cones were taken from a single specimen, a 30 year old P. pumila tree