Cultivars of uncertain origin

Sorbus 'Joseph Rock'

Fastigiate tree with reddish buds. Leaves of up to 21 leaflets. Flowers white. Fruit mostly yellow, occasionally crimson. Possibly a chance natural hybrid, raised from seeds collected by Joseph Rock in Yunnan, China, in 1932. Susceptible to Fireblight.

kingdom Plantae
phylum   Tracheophyta
class    Magnoliopsida
superorder     Rosanae
order      Rosales
family       Rosaceae
genus        Sorbus L.