Suffruticosa Group Cultivar. Unregistered. Various hybridizers. This plant is represented by any number of plants throughout the world with different cultivar designations. Joseph Rock collected seed from a cultivated plant in China during a collecting trip. The original plant was not the species or one of it variants, but rather a Suffruticosa Group cultivar which had significant influence from the species P. rockii ssp. atava. Seeds were sent to various people and plants then were grown and distributed. More seedlings were produced from these plants – any of which may fit the description. Cultivars commonly present in commerce are: ‘Rock’s Variety’, ‘Joseph Rock’, ‘Highdown’, ‘US’, ‘UK’ and others.
Rock’s Variety should be treated as a group of plants with similar characteristics and lineage. Characteristics of Rock’s Variety group plants are large white single flowers with black-maroon basal flares; often blush in color when opening. Plants have been heavily used in hybridizing efforts and seedlings occur in a wide range of color, form and flare configurations. Plants are variable in size, growth habit, floral display and vigor.