Nodular roots: Plants of pea family have roots with nodules. Symbiotic  nitrogen fixing such as Rhizobium live in the root nodules and fix atmospheric nitrogen.

nodular roots

Example: Touch me not( Mimosa pudica)

Velamen roots are the moisture absorbing aerial roots of epiphytic orchids. These have a special type of tissue called velamen tissue for absorbing moisture from the atmosphere.
Example: Vanda

Reproductive roots: Some plant produce roots with adventitious buds called radical buds. These buds can develop into new plants.

Example: Murraya and Teak (Tectona gradis)
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