Red-flowering currant 
Redcurrant 
Reddish orpine 
Reflexed Stonecrop 
Ribes bracteosum 
Rock Stonecrop 
Rockcress 
Roseroot 
Rosularia lineata 
Rosularia sempervivum 
Rue-leaved Saxifrage 
Rufous stonecrop 
Russethair saxifrage 
Saffron-flowered Saxifrage 
Saucer Plant 
Saxifraga aizoides 
Saxifraga carpetana subsp. Graeca 
Saxifraga hederacea 
Saxifraga mertensiana 
Saxifraga rotundifolia 
Saxifraga stellaris 
Saxifraga stribrnyi 
Sedum acre 
Sedum anglicum