Rhododendron thomsonii subsp. lopsangianum (Cowan) D.F.Chamb.
Synonym(s):
Rhododendron lopsangianum Cowan
Data source(s):
  • Argent, C.G.C., J. Bond, D.F. Chamberlain, P. Cox & A. Hardy 1997. The Rhododendron Handbook. The Royal Horticultural Society 352, t.16 pp., p.191
  • Chamberlain, D.F. 1982. A revision of Rhododendron II. Subgenus Hymenanthes. in Notes from the Royal Botanic Garden Edinburgh 39(2): 209-486, p.420, FlagO