ḴÁ,EW̱ [SENĆOŦEN], Pacific crabapples, Malus fusca, is an important fruit tree throughout the North Pacific region and is recorded from Sequoia National Park in California, mainly along the Pacific coast, to Alaska’s Kenai Peninsula (Routson, Volk, Richards, Smith, Nabhan and Wyllie de Echeverria 2012). The extent of the far western extent of this species in the Aleutian Islands remains poorly charted.
Given that Malus fusca sometimes hybridizes with other wild and landrace species in the primary gene pool of cultivated apple, there are a number of east Asian species near adjacent coasts spanning Alaska, Far Eastern Russia, Japan, Korea and China including M. floribunda, M. baccata, M. mandhurica, M. asiatica, M. komarovii, and M. sieboldii. And with aerial pollination some alleles and genotypes move around the North Pacific region — especially along and close to areas with mild maritime climates. And many of these gene flows are vulnerable to climate change and urbanization.
reference
Kanin J. Routson , Gayle M. Volk, Christopher M. Richards, Steven E. Smith, Gary Paul Nabhan, and Victoria Wyllie de Echeverria. 2012. Genetic Variation and Distribution of Pacific Crabapple. Journal of the American Society for Horticultural Science. 137(5): 325–332.