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Edgar Anderson on the origin of Iris versicolor and Iris x robusta
Edgar Anderson showed that The species Iris versicolor arose from crosses of Iris virginica and Iris setosa var. interior He also noted that Iris x robusta came from crosses with virginica and versicolor.
* Reference: Anderson, E. S, (1928), The Problem of Species in the Northern Blue Flags, Iris versicolor L. and Iris virginica L. Annals of the Missouri Botanical Garden 15: 241-332. Iris setosa |
and | Iris virginica |
= | Iris versicolor |
Anderson noted a second species cross creating Iris x robusta from virginica and versicolor crossed
| Iris virginica |
and | Iris versicolor |
= | Iris x robusta  |
Iris x robusta flowers often apear similar to Iris versicolor but it can be distinguished by its purple foliage, stems and bracts. The gallery below list varieties of robusta that have been given cultivar names.
'Beetroot' , |
'Brighter Days', | 'Cast Ashore' , |
'Dark Aura' . |
'Gem Dandy', | 'Gerald Darby' , |
| 'Indomitable', | SpxJennyJoy | 'Mountain Brook' , |
| 'Norris Lavender', | 'Nutfield Blue', | 'Park Spark' . |
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Topic revision: r2 - 24 Oct 2022, BobPries
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