| Canna glauca | |
|---|---|
| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Monocots |
| (unranked): | Commelinids |
| Order: | Zingiberales |
| Family: | Cannaceae |
| Genus: | Canna |
| Species: | C. glauca |
| Binomial name | |
| Canna glauca L. |
|
Canna glauca L. is a species of the Canna genus, a member of the family Cannaceae. It originates from the wetlands of tropical America and was introduced to England in 1730. It is a perennial growing to 1.5m. It is hardy to zone 10 and is frost tender. In the north latitudes it is in flower from August to October, and the seeds ripen in October. The flowers are hermaphroditic.[1]
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In the last three decades of the 20th century, Canna species have been categorised by two different taxonomists, Paulus Johannes Maria Maas from the Netherlands and Nobuyuki Tanaka from Japan. Inevitably, there are differences in their categorisations.
Both agree that C. glauca is a distinct species, but in addition, Tanaka also recognises a separate variety.
It is aquatic species, with narrow, blue-green (glaucous) leaves, atop of which sit its large, delicate, pale yellow flowers. It grows as a marginal plant in up to about 15cm of still or slow-moving water.
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This is a contentious variety as it occurs widely in South and Southeast Asia, where it is supposed to have differentiated within the past few centuries.
The species prefers light (sandy), medium (loamy) and heavy (clay) soils and requires well-drained soil. The preferred soil is acid, neutral and basic (alkaline). It cannot grow in the shade and requires moist soil.