| 1 | Inflorescence, including perianth, velutinous to tomentose, indument obscuring the surface; ovary indument long, bushing outwards; fruit velutinous |
| 1' | Inflorescence glabrous to sparsely pilose or furfuraceous; ovary glabrous or very short-strigose and/or appressed-tomentose; fruit glabrous |
| 2 | Petioles well defined, 3.5-4 mm broad at midlength; leaves thickly coriaceous, rigid, often splitting when dry, margin ridged beneath, indument very short-strigose, rufous, only distinguishable under high magnification, giving inflorescence and undersurface of young leaves a very dark red tinge |
| 2' | Petioles poorly defined, 1-3 mm broad at midlength; leaves subcoriaceous to coriaceous (in some specimens of R. montana), margin not ridged beneath, indument absent or pilose to tomentose, without dark tinge |
| 3 | Fruit strongly curved on sutured side, hemispherical, 1.8-2.2 cm wide, drying dark brown or black when mature; flowers 3.5-5 mm long; pedicels 0.3-0.4 mm broad; ovary glabrous or with sparse indument |
| 3' | Fruit curved more or less equally at sutured and unsutured sides, 0.8-1.6 cm wide, drying beige or grey or black; flowers 5-14 mm long; pedicels 0.3-1 mm broad; ovary hairy (except very rarely in R. obtusata) |
| 4 | Inflorescence sparsely pilose to densely tomentose; fruit not conspicuously ridged nor with a thickened marginal vein; leaves entire or serrate; tertiary venation conspicuous beneath |
| 4' | Inflorescence glabrous; fruit usually veiny due to underlying vascular tissue, mature fruits with a thickened marginal vein; leaves strictly entire; tertiary venation inconspicuous beneath |
