Canna species have been categorised by two different taxonomists in the course of the last three decades. They are Paul Maas, from the Netherlands and Nobuyuki Tanaka from Japan. Both reduced the number of species from the 50-100 that had been accepted previously, and assigned most to being synonyms. Inevitably, there are some differences in their categorisations, and the individual articles on the species describe the differences.
The reduction in the number of species is also confirmed by work done by Kress and Prince at the Smithsonian Institution, however, this only covers a subset of the species range.
Tanaka's 2001 Taxonomic revision of the family Cannaceae in the New World and Asia is the source of species names that, after cultivating many of them, I find most credible, allied with the proposal to conserve the name Canna tuerckheimii over C. latifolia.
- Canna amabilis T.Koyama & Nob.Tanaka
- Canna bangii Kraenzl.
- Canna coccinea Blanc.
- Canna compacta Rosc.
- Canna discolor (Lindl.) Nob.Tanaka
- Canna discolor var. discolor
- Canna discolor var. rubripunctata Nob.Tanaka
- Canna discolor var. viridifolia Nob.Tanaka
- Canna flaccida Salisb.
- Canna glauca L.
- Canna glauca var. siamensis (Kraenzl) Nob.Tanaka
- Canna indica L.
- Canna indica var. flava (Roscoe ex Baker) Nob.Tanaka
- Canna indica var. maculata (Hook) Nob.Tanaka
- Canna indica var. sanctae-rosae (Kraenzl.) Nob.Tanaka
- Canna indica var. warszewiczii (A.Dietr.) Nob.Tanaka
- Canna iridiflora Ruiz & Pav.
- Canna jacobiniflora T.Koyama & Nob.Tanaka
- Canna jaegeriana Urb.
- Canna liliiflora Warsc. ex Planch.
- Canna lineata Ciciar.
- Canna paniculata Ruiz & Pav.
- Canna patens Rosc.
- Canna pedunculata Sims
- Canna plurituberosa T.Koyama & Nob.Tanaka
- Canna speciosa Rosc.
- Canna stenantha Nob.Tanaka
- Canna tandilensis Ciciar.
- Canna tuerckheimii Kraenzl.
- Canna tuerckheimii var. Altenstienii
- Canna tuerckheimii var. Gigantea
- Canna tuerckheimii var. Marabout
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