In the great family of gesneriads, there are three different root systems. 

Fibrous roots, including, among others, the following types: 

Aeschynanthus, Chirita, Codonanthe, Columnea, Episcia, Gesneria, Nematanthus, Streptocarpus ...

Scaly rhizomes: 

Achimenes, Gloxinia, Kohleria, Smithianta...

And tuberous roots:

Chrysothemis, Nautilocalix, Sinningia...