Omei rose

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Omei rose
Illustration of the first description by Robert Allen Rolfe in Botanical Magazine, Volume 138, Plate 8471

Illustration of the first description by Robert Allen Rolfe in Botanical Magazine , Volume 138, Plate 8471

Systematics
Family : Rose family (Rosaceae)
Subfamily : Rosoideae
Genre : Roses ( pink )
Subgenus : pink
Type : Silk rose ( Rosa sericea )
Variety : Omei rose
Scientific name
Rosa sericea var. Omeiensis
( Rolfe ) GDRowley

The Omei Rose ( Rosa sericea var. Omeiensis ) is a variety of plant species Rosa sericea ( Rosa sericea ) from the genus roses ( Rosa ) within the family of the rose family (Rosaceae). It is also called the Mount Omei Rose . The trivial names are based on the fact that the type material was collected in the mountains of Emei Shan ( Wade-Giles O-mei Shan).

description

Appearance and leaf

Rosa sericea var. Omeiensis grows as an independently upright shrub with heights of 1 to 4 meters. The slender branches often have no spines. If there are spines , then they sit in pairs below the leaves and are up to 7 millimeters long, petiolate, straight. There may also be bristles standing close together.

The alternately arranged leaves are 3 to 6 centimeters long, including the petiole, and pinnate unpaired with mostly 9 to 13, rarely up to 17 leaflets. The leaf rhachis and the petiole have few spines. The leaflets are 8 to 30 millimeters long and 4 to 10 millimeters wide, oblong or elliptically elongated with a rounded-blunt or broad-wedge-shaped base, a pointed or rounded-blunt upper end, and a pointed-sawn edge. The leaflets are glabrous or hairy on the underside and may have glands; the top is bald and has concave central nerves. The two stipules are fused with the petiole and the free part is triangular-egg-shaped with a serrate or smooth edge; they sometimes have glands.

Omei rose blossom

Flower and fruit

The early flowering period in China extends from May to June. The flowers are solitary in the leaf axils. Bracts are missing. The 6 to 20 millimeter long peduncle is bare. The hardly fragrant, hermaphrodite flowers are 2.5 to 3.5 centimeters in diameter and have a radial symmetry with a double flower envelope . The bare flower cup (hypanthium) is obovate or pear-shaped. It is noticeable that Rosa omeiensis has four-fold flowers, while most rose species are five-fold. The four sepals are lanceolate with a pointed or long tailed upper end, entire and the underside is hairy sparsely downy. The four free white petals are obovate-triangular with a broad, wedge-shaped base and an edged upper end. There are many stamens present. The free styles are shorter than the stamens and shaggy hairy.

The bald, yellow fruit stalk is 6 to 20 millimeters long, stocky, fleshy and tapers to the rose hip. When ripe, the rose hips are light to deep red or yellow and have a diameter of 8 to 15 millimeters and are obovate or pear-shaped and bald or hairy with glandular hairs. The four durable sepals stand upright on the rose hips. The rose hips ripen in China from July to September.

Occurrence

Rosa sericea var. Omeiensis is in the Chinese provinces regions of Gansu , Guizhou , Hubei , Ningxia , Qinghai , Shaanxi , Sichuan , Yunnan and the autonomous region of Tibet spread. It thrives in fir forests, thickets, bushes, on pastures and on slopes at altitudes of 700 to 4000 meters.

Systematics

It was first described in 1912 under the name ( Basionym ) Rosa omeiensis by Robert Allen Rolfe Botanical Magazine , Volume 138, Plate 8471. The new combination to Rosa sericea var. Omeiensis (Rolfe) GDRowley was published in 1959 by Gordon Douglas Rowley in Bulletin du Jardin botanique de l 'État à Bruxelles , Volume 29, 3, p. 210 published.

The Rosa sericea complex has been the subject of controversy. For example, the silk rose ( Rosa sericea Lindl.) Was listed as a separate species in the Flora of China 2003, but it is often found in literature and on the Internet as a synonym for Rosa omeiensis . In 2008 Wei et al. examined extensive herbarium material and examined the pollen morphology and seed coat structure. Wei et al. could show that it is a variety Rosa sericea var. omeiensis . Synonyms Rosa sericea var. Omeiensis Rolfe are: Rosa sericea subsp. omeiensis (Rolfe) AVRoberts , Rosa sericea f. aculeatoeglandulosa Focke , Rosa sericea f. inermieglandulosa Focke , Rosa sorbus H.Lév. , Rosa sericea f. glandulosa TTYu & TCKu , Rosa omeiensis f. paucijuga T.T.Yu & TCKu ,

Rosa sericea var. Omeiensis has been a variety of the species Rosa sericea since 2008 and belongs to the section Pimpinellifoliae from the subgenus Rosa in the genus Rosa .

swell

  • Gu Cuizhi, Kenneth R. Robertson: Rosa : Rosa omeiensis , p. 354 - online with the same text as the printed work , In: Wu Zheng-yi & Peter H. Raven (eds.): Flora of China , Volume 9 - Pittosporaceae through Connaraceae , Science Press and Missouri Botanical Garden Press, Beijing and St. Louis, 2003. ISBN 1-930723-14-8
  • Xiao-Mei Wei, Xin-Fen Gao, Li-Bing Zhang: A systematic study of Rosa sericea (Rosaceae) complex: Are R. omeiensis and R. sericea conspecific? In: Journal of Systematics and Evolution , Volume 46, Issue 6, 2008, pp. 919-928. Full text PDF. (Only the introduction and the identification key are in English, the main part in Chinese language / script.)

Individual evidence

  1. ↑ Rosa sericea in the Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved November 18, 2014.
  2. ↑ a b c d e f g Gu Cuizhi, Kenneth R. Robertson: Rosa : Rosa omeiensis , p. 354 - online with the same text as the printed work , In: Wu Zheng-yi & Peter H. Raven (eds.): Flora of China , Volume 9 - Pittosporaceae through Connaraceae , Science Press and Missouri Botanical Garden Press, Beijing and St. Louis, 2003. ISBN 1-930723-14-8
  3. ↑ a b c Xiao-Mei Wei, Xin-Fen Gao, Li-Bing Zhang: A systematic study of Rosa sericea (Rosaceae) complex: Are R. omeiensis and R. sericea conspecific? In: Journal of Systematics and Evolution , Volume 46, Issue 6, 2008, pp. 919-928.
  4. ^ Rolfe scanned in 1912 at biodiversitylibrary.org .
  5. ^ Gu Cuizhi, Kenneth R. Robertson: Rosa. : Rosa sericea , p. 354 - the same text online as the printed work , In: Wu Zheng-yi & Peter H. Raven (Eds.): Flora of China , Volume 9 - Pittosporaceae through Connaraceae , Science Press and Missouri Botanical Garden Press, Beijing and St. Louis, 2003. ISBN 1-930723-14-8

further reading

  • Charles & Brigid Quest-Ritson: Roses: The Great Encyclopedia / The Royal Horticultural Society; Translation by Susanne Bonn; Editor: Agnes Pahler; Dorling Kindersley, Starnberg 2004, p. 361, ISBN 3-8310-0590-7 .

Web links

Commons : Rosa omeiensis  - album with pictures, videos and audio files