This species is a shrub.[1] It has prominent fleshy trichomes on the leaf and shoot surfaces, which are an important feature in identifying the species.[3]
Taxonomy
It may be confused with Hydrangea robusta Hook.f. & Thomson, which also has similar fleshy trichomes. Both species are placed within Hydrangea section Asperae.[3]
^The Explorer's Garden: Shrubs and Vines from the Four Corners of the World By Daniel J. Hinkley, Lynne Harrison. Page 175. Timber Press, 2009 ISBN0881929182/ISBN9780881929188