Table 1.
Rhizomatous Iris species' natural habitats are correlated with the type of exodermis they develop and whether aerenchyma is present (+) or absent (–)
| Iris species | Natural habitat | Type of exodermis | Aerenchyma |
|---|---|---|---|
| 1I. germanica L. | Well-drained soil | Multiseriate | – |
| 1I. pumila L. | Well-drained soil | Multiseriate | – |
| 1I. pallida Lam. | Well-drained soil | Multiseriate | – |
| 1I. sambucina L.* | Well-drained soil | Multiseriate | ? |
| 2I. sibirica L. | Water-saturated soil | Uniseriate | + |
| 2I. spuria L. | Water-saturated soil | Uniseriate | + |
| 2I. versicolor L. | Water-saturated soil | Uniseriate | + |
| 2I. hexagona Walt. | Water-saturated soil | Uniseriate | + |
| 2I. pseudacorus L. | Water-saturated soil | Uniseriate | + |
| 2I. virginica L.† | Water-saturated soil | Uniseriate | + |
1, ‘bearded’ irises; 2, ‘beardless’ irises.
* Observed by Kroemer (1903); † observed by Stevens (2003).