There is significant disagreement over the number of true rose species. Some species are so similar that they could easily be considered variations of a single species, while other species show enough variation that they could easily be considered to be different species. Lists of rose species usually show between 100 and 150 with most botanists agreeing that the actual number is probably nearer the lower end of that range. This article needs additional references or sources for verification. ... Botany is the scientific study of plant life. ...
Subgenera and sections
The genus Rosa is subdivided into four subgenera:
Hulthemosa (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 roses without compound leaves or stipules.
Hesperrhodos (from the Greek for "western rose") has two species, both from southwestern North America. These are R. minutifolia and R. stellata.
Platyrhodon (from the Greek for "flaky rose", referring to flaky bark) with one species from east Asia, R. roxburghii.
Rosa (the type subgenus) containing all the other roses. This subgenus is subdivided into 11 sections.
Carolinae - white, pink, and bright pink species all from North America
Chinensis - white, pink, yellow, red and mixed-color roses from China and Burma
Gallicanae - pink to crimson and striped roses from western Asia and Europe
Gymnocarpae - a small group distinguished by a deciduous receptacle on the hip; one species in western North America (R. gymnocarpa), the others in east Asia
Pimpinellifoliae - white, pink, bright yellow, mauve and striped roses from Asia and Europe
Rosa (syn. sect. Cinnamomeae) - white, pink, lilac, mulberry and red roses from everywhere but North Africa
Synstylae - white, pink, and crimson roses from all areas
Small Text For other uses, see Asia (disambiguation). ... “Foliage†redirects here. ... The lanceolate-linear, paired stipules of Hibiscus kokio In botany, stipule refers to outgrowths borne on either side of the base of a leafstalk (or petiole). ... North America North America is a continent[1] in the Earths northern hemisphere and (chiefly) western hemisphere. ... In scientific classification, a type is a specimen or description that corresponds to a taxon (a group of organisms), and helps to identify which organisms may be referred to with that name. ... Small Text For other uses, see Asia (disambiguation). ... World map showing the location of Europe. ... North Africa is the Mediterranean, northernmost region of the African continent, separated by the Sahara from Sub-Saharan Africa. ... North America North America is a continent[1] in the Earths northern hemisphere and (chiefly) western hemisphere. ... Small Text For other uses, see Asia (disambiguation). ... World map showing the location of Europe. ... North Africa is the Mediterranean, northernmost region of the African continent, separated by the Sahara from Sub-Saharan Africa. ...
Some species are so similar that they could easily be considered variations of a single species, while other species show enough variation that they could easily be considered to be different species.
Lists of rosespecies usually show between 100 and 150 with most botanists agreeing that the actual number is probably nearer the lower end of that range.
Platyrhodon (from the Greek for "flaky rose", referring to flaky bark) with one species from east Asia, R.
The species form a group of generally thorny shrubs or climbers, and sometimes trailing plants, reaching 2–5 m tall, rarely reaching as high as 20 m by climbing over other plants.
The leaves of most species are 5–15 cm long, pinnate, with (3–) 5–9 (–13) leaflets and basal stipules; the leaflets usually have a serrated margin, and often a few small thorns on the underside of the stem.
The phrase sub rosa or "under the rose", means to keep a secret—derived from the ancient Roman practice of placing a wild rose on the door of a room in which a confidential discussion or meeting was being held.
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