tetraploid
Having twice the normal number of chromosomes.
GardenWeb Glossary of Botanical Terms
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tetraploid
This is a plant that has four sets of chromosomes. This genetic anomaly often results in plants that are larger or are mutated in some way.
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Tetraploid (polyploid)- A cell, tissue, or organism having four sets of chromosomes.
Tetraploid
A plant that has twice the number of chromosomes, resulting in larger, thicker flowers. Often, there will be more blooms.
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These tetraploid trumpet lilies represent a dramatic advance in lily hybridization. Huge, long-lasting flowers are borne proudly on sturdy stems 5 to 7 feet tall.
Basically, when you cross a male diploid watermelon, meaning one that has 22 chromosomes, with a female tetraploid, meaning one that's been treated to double its chromosome count to 44, the resulting offspring will be a triploid with 33 chromosomes.
Many blossoms are bi- or tri-colored. Many modern daylilies are called "tetraploids." They have twice as many chromosomes as the normal "diploid" varieties. These sturdy varieties generally have larger leaves, stalks, and flowers.
But beardeds now come in several variations, including miniature dwarfs, at 8 in (20.3 cm); medians up to 27 in (68.5 cm); and large-flowered "tetraploid" varieties. However, old hybrids tend to be tougher and are
often more fragrant.
 See also: Plant, Chromosome, Gardener, Flower, Soil
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