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Rosa rugosa

 

Rosa rugosa

Rosa rugosa
Rosa rugosa flower
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Rosales
Family: Rosaceae
Genus: Rosa
Species: R. rugosa
Binomial name
Rosa rugosa
Thunb.

Rosa rugosa (rugosa rose, Japanese rose, or Ramanas rose) is a species of rose native to eastern Asia, in northeastern China, Japan, Korea and southeastern Siberia, where it grows on the coast, often on sand dunes.[1] It should not be confused with Rosa multiflora, which is also known as "Japanese rose".

Contents

  • Description 1
  • Cultivation and uses 2
  • Invasive species 3
  • Vernacular names 4
  • References 5
  • External links 6

Description

Rosa rugosa buds on Grape Island, Massachusetts

Rosa rugosa is a suckering shrub which develops new plants from the roots and forms dense thickets 1–1.50 m tall with stems densely covered in numerous short, straight prickles 3–10 mm long. The leaves are 8–15 cm long, pinnate with 5–9 leaflets, most often 7, each leaflet 3–4 cm long, with a distinctly corrugated (rugose, hence the species' name) surface. The flowers are pleasantly scented, dark pink to white (on R. rugosa f. alba (Ware) Rehder), 6–9 cm across, with somewhat wrinkled petals; flowering occurs in spring.[1]

Rosa rugosa in bloom.
Rugosa rose hips resemble tomatoes

The hips are large, 2–3 cm diameter, and often shorter than their diameter, not elongated; in late summer and early autumn the plants often bear fruit and flowers at the same time. The leaves typically turn bright yellow before falling in autumn.

Cultivation and uses

Rosa rugosa is widely used as an ornamental plant. It has been introduced to numerous areas of Europe and North America. It has many common names, several of which refer to the fruit's resemblance to a tomato, including beach tomato or sea tomato; others include saltspray rose, beach rose, potato rose and Turkestan rose.[2] Its fruit are sometimes mistaken for those of the beach plum – despite being entirely different in size, shape, color, texture and taste.

The sweetly scented flowers are used to make pot-pourri in Japan and China, where it has been cultivated for about a thousand years.

This species hybridises readily with many other roses,[2] and is valued by rose breeders for its considerable resistance to the diseases rose rust and rose black spot. It is also extremely tolerant of seaside salt spray and storms, commonly being the first shrub in from the coast. It is widely used in landscaping, being relatively tough and trouble-free. Needing little maintenance, it is suitable for planting in large numbers; its salt-tolerance makes it useful for planting beside roads which need deicing with salt regularly.

Numerous cultivars have been selected for garden use, with flower colour varying from white to dark red-purple, and with semi-double to double flowers where some or all of the stamens are replaced by extra petals. Popular examples include 'Fru Dagmar Hastrup' (pink, single), 'Pink Grootendorst' (pink, semi-double), 'Blanc Double de Coubert' (white, double) and the more common 'Roseraie de L’Haÿ' (pink, double), which is often used for its very successful rootstock and its ornamental rose hips.

Invasive species

Rosa rugosa is naturalized in many parts of Europe, and it is considered an invasive species in some habitats, particularly in seashores of North Europe. It can out-compete native flora, thereby threatening biological diversity.[3] On Sylt, an island in the north of Germany, it is sufficiently abundant to have become known as the "Sylt rose".[2] It is also considered a noxious weed in the USA.[4]

R. rugosa was first introduced into North America in 1845. The first report of it being naturalized far from the location in which it was planted occurred on Nantucket Island in 1899. Ten years later, it was said to be "straying rapidly", and today it is naturalized on the entire coast of New England.

Vernacular names

In Japanese, it is called hamanasu (ハマナス), meaning "shore eggplant" and also hamanashi () meaning "shore pear". The Chinese call it "meiguihua" (玫瑰花), literally "flowers of red jade". In Korean, the species is called haedanghwa (해당화, 海棠花), literally "flowers near seashore".[5]

References

  • Huxley, A., ed. (1992). New RHS Dictionary of Gardening. Macmillan.
  1. ^ a b "Flora of China". eFlora. Retrieved 15 October 2011. 
  2. ^ a b c "Rosa rugosa". Invasive Species Compendium.  
  3. ^ Weidema, I. (2006). "Rosa rugosa"NOBANIS — Invasive Alien Species Fact Sheet — (PDF). Online Database of the European Network on Invasive Alien Species — NOBANIS www.nobanis.org. Retrieved 29 August 2012. 
  4. ^  
  5. ^ "Haedanghwa (해당화)" (in Korean). Korea National Arboretum. Retrieved 2008-08-06. 

External links

  • Bruun, H.H. (2005). "Rosa rugosa Thunb. ex Murray". Journal of Ecology 93 (2): 441–470.  
  • Rosa rugosahort.net profile
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