Borovice zhuštěná (Pinus densata) z tibetské části Číny je unikátním druhem mezi borovicemi světa: dosahuje nejvyšší výšky výskytu okolo 4 300 m n. m. (konkurované jediným druhem v tropech Ameriky), osídluje široké spektrum biotopů od subtropických údolních pralesů (subsp. tibetica) po skalnaté hřebeny velehor; jako druh s extrémními ekologickými adaptacemi a složitou evolucí se z hlediska molekulární genetiky stala nejstudovanější borovicí; její varieta pygmaea je nejmenší borovici světa (do 2 m výšky).
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Pinus densata from the Tibetan part of China is a unique species among world pines – it reaches the highest elevation of approximately 4 300 m (rivalled by the only species in tropical America), and colonises the broad biotop spectrum from subtropical valley forests (P. d. subsp. tibetica) to the rocky ridges of high mountains; it is the pine that has been most researched by molecular genetics as a species with extreme ecological adaptations and complex evolution. Pinus densata var. pygmaea is the smallest pine in the world (up to 2 m).
