Rosa bracteata

The rose tree of Macartney ( Rosa bracteata ) is a species of Rosier originating in the south of the China, of Taiwan and Japan (islands Ryukyu).

This rose tree was introduced in England in 1793 per Lord Macartney. It is naturalized in the south-east of the the United States.

It is the single species constituting the section of the Bracteatæ sub-genus Eurosa .

Description

Rosa bracteata is a shrub which can reach 4 meters in height. Its stems which sucker are armed with bent pivots laid out per pairs. The persistent Feuille are made up from 5 to 9 elliptic leaflets from 2 to 5 cm length, at the crenelated edges.

The Fleur S white, silky, simple, from 5 to 7 cm in diameter, are generally solitary. Their center, orange yellow, are made of very many cheesecloths. They exhale a lemon odor. The chalice is surrounded by large bractées foliaceous green, from where the specific adjective bracteata . Flowering is continuous

The Cynorrhodon S are 3 cm in diameter approximately.

changes and hybrids

Contrary to much of other rose trees originating in China arrived to Europe during XVIIIe and XIXe centuries, this species, after having given many Hybrid S, does not play any more one great part in creation of new cultivars.

Rosa bracteata exists in China of the South under two species (change?) and it was not naturalized in the South-east of the United States
it does not remain any more but two known hybrids:

Rosa X leonida or climbing “Alba odorata” one with double white flowers, Rosa bracteata X Rosa lævigata ;
“Mermaid”, rose tree climbing with large simple flowers yellow canary which flowers of July to the autumn, is only still cultivated. It is Rosa bracteata X Rosier the yellow with double flowers.

Notes and references of the article

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