Some plants bear conventional basal roots that penetrate soil, but they also have adventitious roots that grow on their stems. ... Epiphytic and most lithophytic orchids lack conventional roots altogether, and use only adventitious roots, which arise primarily from stem nodes.

What type of roots does orchids have?

The roots of many species of orchid attach to trees and shrubs in order to absorb moisture and nutrients through the special velamen coating. These types of rooting systems are known as air roots and are common in most species of orchid.

Which plants have adventitious roots?

Adventitious roots are formed in many plants naturally (e.g., climbing roots in ivy, prop roots in corn, stilt roots in Pandanus), as well as in cuttings of stems or leaf petioles, and by “layering.”