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Rosa banksiae Rosa persica. There are currently four subgenera in Rosa, although there have been some disputes over the years. [3] The four subgenera are: Hulthemia (formerly Simplicifoliae, meaning "with single leaves") containing one or two species from Southwest Asia, R. persica and R. berberifolia (syn. R. persica var. berberifolia) which are the only species without compound leaves or ...
The rose family is considered one of the six most economically important crop plant families, [37] and includes apples, pears, quinces, medlars, loquats, almonds, peaches, apricots, plums, cherries, strawberries, blackberries, raspberries, sloes, and roses. Many genera are also highly valued ornamental plants.
Taking overall size and shape, the most common type is the bush rose, a rounded plant from 2 foot up to about 7 foot tall, above which height roses generally fall into the "'climbing and rambling'" class, the latter spreading wider; support is needed for these.
Pruning and cutting back of the plant often leads to re-sprouting. Two natural biological controls include the rose rosette disease and the rose seed chalid (Megastigmus aculeastus var. nigroflavus). [8] Patches of introduced multiflora rose in Pennsylvania are displaying symptoms of rose rosette disease, which can lead to decline and death. [9]
The ploidy of this rose species is variable. Botanical authorities have listed it as tetraploid and hexaploid in North America (subsp. sayi), [6] and octoploid in Eurasia (subsp. acicularis), [6] including China. [7] On the northern Great Plains its populations are generally tetraploid. [citation needed] Hexaploid populations exist in the Yukon.
Rosa gallica, the Gallic rose, French rose, or rose of Provins, is a species of flowering plant in the rose family, native to southern and central Europe eastwards to Turkey and the Caucasus. Rosa gallica was one of the first species of rose to be cultivated in central Europe. [2] It is a parent of several important cultivars.
The species is extensively cultivated as an ornamental plant, and numerous cultivars have been selected, which are known as the China roses. It has also been extensively interbred with Rosa gigantea to produce Rosa × odorata and by further hybridization the tea roses and hybrid tea roses, and is the source of summer-blooming varieties and ...
The most important rose cultivars bred by major breeders have code names as registration names. A code name or ICRAR code is a unique code, consisting of letters of the 26‑letter Roman alphabet, given to a new registered rose variety, to distinguish it from other varieties (cultivars) of roses.
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