Sunday, April 29, 2007



This is a pic of Canna..

Seeds are produced from sexual reproduction, involving the transfer of pollen from the stamen of the pollen parent onto the stigma of the seed parent. In the case of Canna, the same plant can usually play the roles of both pollen and seed parents, technically referred to as a hermaphrodite. However, the cultivars of the Italian Group are almost always seed sterile and their pollen has a low fertility level. Mutations are almost always totally sterile.
Pollination
The species are capable of self-pollination, but most cultivars require an outside pollinator. All cannas produce nectar and therefore attract nectar consuming insects, bats and hummingbirds that act as the transfer agent, spreading pollen between stamens and stigmas, on the same or different inflorescence.
Genetic changes
Since genetic recombination has occurred a cultivar grown from seed will have different characteristics to its parent(s) and thus should never be given a parent’s name. The wild species have evolved in the absence of other Canna genes and are deemed to be ‘true to type’ when the parents are of the same species. In the latter case there is still a degree of variance, producing various varieties or minor forms (forma). In particular, the species C. indica is an aggregate species, having many different and extreme varieties and forma ranging from the giant to miniature, from large foliage to small foliage, both green and dark foliage and many different coloured blooms, red, orange, pink, and yellow and combinations of those colours

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