Rosa ×alba

The white rose tree ( Rosa ×alba ) is a collective name for a hybrid species of Rosier originating in Europe where it is known since the Antiquity and cultivated since the Rebirth. It is in fact a group of Hybride S whose relationship is dubious, probably resulting from crossings between Rosa gallica × Rosa will corymbifera or Rosa ×damascena × Rosa canina . Synonymous: Rosa ×alba L. VAr. semiplena hort.

Description

It is a Arbuste with drawn up port, with null and void sheets, two height meters approximately, relatively rustic.

The Feuille S imparipennées count of five five centimetres length oval or round leaflets approximately, at the tightened edge, without glandular hairs.

The white and odorous Flowers, from 6 to 8 centimetres in diameter, are simple (five petals) or doubles; they are grouped in corymbes from 2 to 7 flowers and appear at the beginning of summer (flowering not going up).

The Fruit S are Cynorrhodon S globulous with oblong 1,2 cm in diameter, reds with maturity.

Cultivated varieties

Rosa ×alba
Rosa ×alba “Semiplena”, white pink of York, already cultivated by the Romans, who still exists in a wild state in Kurdistan,
Rosa ×alba “Maximum” , or pink of Jacobites, sport of “Semiplena”, with large double white flowers,
Rosa ×alba “Incarnata”, or “the Royal one”, with almost double flowers pink clearly, very old (present on paintings of the 15th century).

Hybrids

“Thigh of Nymph”, “Thigh of Nymph moved” and “Small Thigh by Nymph”, with very double flowers pale pink,
“Celestial”, with half-double flowers pale pink,
“Perfect Pompom” or “Perfect White Pompom”,
“York and Lancaster” (for some Rosa ×damascena “versicolor”), with large pink and white flowers.

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