Fig. 4

Response curve of the key environmental factors(a: Rhododendron nyingchiense;b: Rhododendron laudandum;c: Rhododendron hypenanthum;d: Rhododendron trichostomum;e: Rhododendron przewalskii;f: Rhododendron trichostomum;g: Rhododendron przewalskii;h: Rhododendron trichostomum.