Cannaceae
Cannaceae Juss. is monogeneric, containing only the genus Canna L., with approximately 10–12 naturally occurring species and numerous cultivated hybrids. Although species delimitation has historically been controversial because of extensive hybridization and cultivation, modern taxonomic treatments based on morphological and molecular evidence recognize a relatively small number of wild species. Cannaceae is closely related to Marantaceae but is readily distinguished by its highly modified androecium and conspicuous petaloid staminodes.
Key characteristics
- Robust perennial herbs with thick rhizomes
- Large alternate leaves with sheathing bases
- Flowers large, brightly coloured, and strongly zygomorphic
- Androecium reduced to one fertile stamen with petaloid staminodes
- Inferior ovary
- Fruit a spiny or warty capsule
- Seeds hard, black, and spherical
Distribution
Cannaceae is native to the tropical and subtropical regions of the Americas, extending from the southern United States through Central America and the Caribbean to northern Argentina. Species occur naturally in wetlands, forest margins, riverbanks, grasslands, and disturbed habitats. Due to their ornamental appeal, cannas are now cultivated throughout tropical, subtropical, and warm temperate regions worldwide and have become naturalized in many countries. Cannaceae is not native to Pakistan. Species and hybrids of Canna, especially Canna indica, are widely cultivated throughout Capital Territory. They are commonly planted in public parks, botanical gardens, university campuses, residential landscapes, and roadside flower beds. Occasionally, cultivated plants may persist near gardens or along irrigation channels, but they are not considered natural components of the native flora.