1. Cuticle is absent at root.
2. Its rhizome is unicellular.
3. It does not have a hypodermis.
4. In this the cortex is not organized into different layers.
5. Pericycle is monolayer.
6. Its vascular bundles are anterior and alternately arranged.
7. Protoxylem towards the periphery and metaxylem towards the center i.e. exarch.
8. Its xylem or phloem bundles are more than 6 in number.
9. The marrow is quite large and conspicuous.