Malus sieversii modern apple cultivars. Unlike domesticated varieties its leaves go red in autumn: 62.2% of the trees in the wild do this compared to only 2.8% of the regular apple plant or the 2,170 English cultivated varieties. The species is now considered vulnerable to extinction. "Malus sieversii" has previously been identified as the main contributor to the genome of the cultivated apple ("Malus pumila"), on the basis of morphological, molecular, and historical evidence. A DNA analysis in 2010 confirmed "M. sieversii" as the progenitor of the cultivated apple. A third species that has been thought to have made contributions to the
Malus fusca tough, resilient wood, used for making implements, and for its bark, used for a wide range of medicinal purposes. Malus fusca Malus fusca, with the common names Oregon crabapple and Pacific crabapple, is a North American species of crabapple. It is native to western North America from Alaska, through British Columbia, to northwestern California. It grows in temperate coniferous forest, primarily in the Cascade Range and the Pacific Coast Ranges. "Malus fusca" is a deciduous tree up to tall. Leaves are up to 10 cm (4 inches) long. Flowers are white or pale pink, blooming in Spring. The fruits are