Pinus bhutanica
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''Pinus bhutanica'', which may be called the Bhutan white pine, is a tree restricted to Bhutan and adjacent parts of northeast India ( Arunachal Pradesh) and southwest
China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and ...
( Yunnan and Tibet). Along with the related '' Pinus wallichiana'' it is a constituent of lower altitude blue pine forests. This pine reaches a height of 25 meters. Note that ''P. wallichiana'' is sometimes called by the common name 'Bhutan pine'. The needles are in bundles of five, up to 25 cm long. The cones are 12–20 cm in length, with thin scales; the seeds are 5–6 mm long, with a 20–25 mm wing. It differs from ''P. wallichiana'' in the much longer, strongly drooping needles, and the cones being slightly smaller and red-brown, rather than yellow-buff, when mature. It is also adapted to generally warmer, wetter climates at lower altitudes, with an intense summer monsoon. Despite the two being closely related and at least occasionally growing together, no hybrids or intermediates have ever been reported.


References

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Further reading

*Grierson, A. J. C., D. G. Long, and C. N. Page. "Notes relating to the flora of Bhutan:(III). Pinus bhutanica: a new 5-needle pine from Bhutan and India." Notes from the Royal Botanic Garden, Edinburgh 38.2 (1980): 297-310. {{Taxonbar, from=Q2386394 bhutanica Flora of Arunachal Pradesh Flora of Tibet Flora of Yunnan Trees of Bhutan Plants described in 1980