Question: Which subgenus of the genus "Vaccinium" does this group of evergreen dwarf shrubs or trailing vines belong to, which Captain Henry Hall firstly successfully cultivated?
Sentence (from "Dryas (plant)"): Dryas is a genus of perennial cushion-forming evergreen dwarf shrubs in the family Rosaceae, native to the arctic and alpine regions of Europe, Asia and North America.
Relevant evidence: No