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P. coronarius argenteo-variegatus has silvery-tinted leaves; P. coronarius flore-pleno, full double flowers; and P. coronarius Keteleeri flore-pleno is the best double-flowered form in cultivation.
The "Swan" variety of the opium-poppy, a dwarfish double-flowered form of a pure white, contained some single-flowered and some red-flowered plants, when sown from commercial seed are said to be pure.
There are also double-flowered varieties, in which the stamens in the centre are replaced by a tuft of narrow petals. It is an old garden favourite, and of the double forms there are named varieties. They grow best in a loamy soil, enriched with well-rotted manure, which should be dug in below the tubers.
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