Table 2 in New taxa of Rhododendron tschonoskii alliance (Ericaceae) from East Asia

Table 2. Diagnostic characters among the Rhododendron tschonoskii alliance.
CharacterR. sohayakiense var. sohayakiense (Type 1)R. sohayakiense var. kiusianum (Type 2)R. sohayakiense var. koreanum (Type 3)R. tschonoskiiR. tsusiophyllumR. trinerveR. tetramerumLeaf length (mm)10-2010-2010-3510-255-1315-505-20Leaf width (mm)4-75-105-155-122-55-205-10Nerve on abaxial surface of leafpinnate 2-3 pairs, obscurely raisedpinnate 2-3 pairs, raisedpinnate 1-3 pairs, raisednervules reticulatenervules obscurely reticulatepinnate 1-2 pairs, prominent, nervules reticulatenervules obscurely reticulateHair of leafdensely strigose on adaxial surface, glabrous or sparsely strigose on abaxial surfacedensely strigose on adaxial surface, sparsely strigose on abaxial surfacedensely strigose on adaxial surface, sparsely strigose on abaxial surfacestrigose on both surfacesdensely strigose on adaxial surface, glabrous on abaxial surfacestrigose on both surfacesdensely strigose on adaxial surface, glabrous or sparsely strigose on abaxial surfaceCorolla formtubular-funnelformtubular-funnelformtubular-funnelformtubular-funnelformtubiformtubular-funnelformtubiformNumber of corolla lobes4445544Corolla tube length (mm)2-33-42-32-45-72-43.5-4.5Corolla lobe length (mm)3-52-53-54-6ca. 24-62-3Style length (mm)4-103-45-66-134-53-72.5-3.5Style conditionexsertedincludedexsertedexsertedincludedexsertedincludedAntheropening by apical poresopening by apical poresopening by apical poresopening by apical poresopening by longitudinal slitsopening by apical poresopening by apical poresDistributionJapan: Honshu (Kii Peninsula) and ShikokuJapan: KyushuSouth Korea: Gyeongsang and Jeolla provincesJapan: Honshu (Kanto and Tohoku districts) and Hokkaido. Russia: Kunashir IslandJapan: Honshu (Chubu and Kanto districts)Japan: Honshu (Kinki, Chubu, Kanto and Tohoku districts)Japan: Honshu (Kinki, Chubu and Kanto districts)