Kerria japonica | |
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Natural form | |
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Cultivar 'Pleniflora' | |
Scientific classification ![]() | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Clade: | Rosids |
Order: | Rosales |
Family: | Rosaceae |
Subfamily: | Amygdaloideae |
Tribe: | Kerrieae |
Genus: | Kerria DC. |
Species: | K. japonica |
Binomial name | |
Kerria japonica | |
Kerria japonica, commonly known as Japanese kerria [1] or Japanese rose, [2] is a deciduous, yellow-flowering shrub in the rose family (Rosaceae), native to China and Japan. It is the only species in the genus Kerria. In the wild, it grows in thickets on mountain slopes. Japanese kerria has been used for medicine and is also planted in gardens. A double-flowered cultivar, K. japonica 'Pleniflora', is commonly called bachelor's buttons.
The genus name Kerria is also a common name for the species (Kerria). It is named after Scottish gardener William Kerr, who introduced the Japanese kerria cultivar 'Pleniflora'.
In addition to the common names mentioned above, it is also known as Japanese marigold bush or miracle marigold bush in northern New England,[ citation needed ] although K. japonica is not closely related to the true marigolds ( Calendula spp.), which are asterids.
It is sometimes known by its Japanese name yamabuki (山吹/ヤマブキ) [3] lit. "mountain butterbur" or "mountain breeze" [4] ); its Chinese name is dìtáng (huā) (棣棠[花]). [5]
Kerria japonica grows to 1–3 m (3.3–9.8 ft) tall, with weak arching stems often scrambling over other vegetation or rocks. In the wild it grows in thickets on mountain slopes. The leaves are alternate, simple, 3–10 cm long, with a doubly serrated margin. The flowers are golden yellow, with five petals, and evenly-spaced along branches of new green growth. The fruit is a dry single-seeded achene 4–4.5 mm long. [6]
Kerria is valued in gardens for its golden yellow flowers, which appear in the spring. It is best grown with some shade from full sunlight to avoid blanching the flowers, and needs to be pruned after flowering to maintain health and vigour. [7] Two cultivars have gained the Royal Horticultural Society's Award of Garden Merit, K. japonica 'Golden guinea' [8] and the double-flowered K. japonica 'Pleniflora', commonly known as bachelor's buttons. [9] [10]
Since 2014 the UK's Royal Horticultural Society has been receiving reports from gardeners and horticulturalists of damage to plants of the shrub Kerria japonica. Symptoms include multiple red spots on leaves, and lesions on the stems, resulting in defoliation and eventual death. It has been determined that this infection is caused by the fungus Blumeriella kerriae , which is specific to the kerria. This highly contagious disease, known in English as kerria twig and leaf blight, was known in the U.S. but has not previously been observed on British plants. It is regarded as a serious threat to the cultivated kerria plants, which are popular garden shrubs. [11]
The plant has anti-inflammatory properties and a decoction of the flowering shoots with honey has been used in China in the treatment of coughs and gynecological disorders. [12] [13]
The leaves and roots contain 0.002% Hydrogen cyanide, while the tender shoots are a rich source of Vitamin C (200 mg/100g) and the seeds contain 44.9% protein and 45.3% fat. [13] The flower petals contain the O-methylated flavonoid pectolinarin, (5,7-dihydroxy-4,6-dimethoxyflavone-7-rutinoside), a cytotoxic compound known also as Neolinarin and found also in Linaria spp., Kickxia elatine and the Duranta species D. plumieri. [14]
#FFA400 [15] [16] |
#FFBF00 |
#F8B500 [17] |
Kerria japonica is mentioned frequently in the Man'yōshū , the oldest extant collection of Japanese poetry from the AD first millennium. In addition, the Japanese call the golden yellow color (variously #FFA400, #FFBF00, #F8B500) between orange and yellow yamabuki color (山吹色yamabuki-iro), from the name of the plant.
Qing Dynasty poet Chen Hao (陳淏) celebrated the beauty of Kerria japonica in his agricultural treatise the Flower Mirror (花鏡).
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Hibiscus syriacus is a species of flowering plant in the mallow family, Malvaceae. It is native to areas of east Asia, but widely introduced elsewhere, including much of Europe and North America. It was given the epithet syriacus because it had been collected from gardens in Syria. Common names include the rose of Sharon,, Syrian ketmia, shrub althea (or simply althea), and rose mallow. It is the national flower of South Korea and is mentioned in the South Korean national anthem.
Weigela is a genus of between six and 38 species of deciduous shrubs in the family Caprifoliaceae, growing to 1–5 m (3–15′) tall. All are natives of eastern Asia. The genus is named after the German scientist Christian Ehrenfried Weigel.
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Hamamelis mollis, also known as Chinese witch hazel, is a species of flowering plant in the witch hazel family Hamamelidaceae, native to central and eastern China, in Anhui, Guangxi, Hubei, Hunan, Jiangxi, Sichuan, and Zhejiang.
Spiraea japonica, the Japanese meadowsweet or Japanese spiraea, is a plant in the family Rosaceae.
Forsythia suspensa, commonly known as weeping forsythia or golden-bell, is a species of flowering plant in the family Oleaceae. It is native to China.
Skimmia japonica, the Japanese skimmia, is a species of flowering plant in the family Rutaceae, native to Japan, China, and Southeast Asia. Growing to 6 m (20 ft) tall and wide, it is a rounded evergreen shrub with glossy, leathery leaves. It is widely cultivated as an ornamental plant in gardens and parks. Its fragrant flowers are cream-yellow or white, followed on female plants by small, round, red fruits. The plant tolerates a wide range of conditions, including frost, drought, and atmospheric pollution. It is suitable for bonsai and for Chinese gardens.
Actinidia kolomikta, the kolomikta, miyamatatabi, super-hardy kiwi, or variegated-leaf hardy kiwi, is a species of flowering plant in the family Actinidiaceae, native to temperate mixed forests of the Russian Far East, Korea, Japan and China.
Aucuba japonica, commonly called spotted laurel, Japanese laurel, Japanese aucuba or gold dust plant (U.S.), is a shrub native to rich forest soils of moist valleys, thickets, by streams and near shaded moist rocks in China, Korea, and Japan. This is the species of Aucuba commonly seen in gardens - often in variegated form. The leaves are opposite, broad lanceolate, 5–8 cm (2.0–3.1 in) long and 2–5 cm (0.79–1.97 in) wide. Aucuba japonica are dioecious. The flowers are small, 4–8 mm (0.16–0.31 in) diameter, each with four purplish-brown petals; they are produced in clusters of 10-30 in a loose cyme. The fruit is a red drupe approximately 1 cm (0.39 in) in diameter that is avoided by birds.
Hydrangea paniculata, or panicled hydrangea, is a species of flowering plant in the family Hydrangeaceae native to southern and eastern China, Korea, Japan and Russia (Sakhalin). It was first formally described by Philipp Franz von Siebold in 1829.
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Berberis japonica is a species of flowering plant in the family Berberidaceae, native to Taiwan. Despite the name, it is not native to Japan, though it has been known in cultivation there for centuries. The wild origins of this species have long puzzled botanists, but wild plants in Taiwan, previously known under the name Mahonia tikushiensis, appear most similar to the cultivated forms of B. japonica.
Camellia × williamsii is a cultivar group of hybrid evergreen shrubs that are derived from a crossing of Camellia saluenensis with Camellia japonica. It was originally bred in 1923 at Caerhays Castle in Cornwall by John Charles Williams.
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Blumeriella kerriae is a species of fungus in the family Drepanopezizaceae.
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Eriocapitella japonica is a species of flowering plant in the buttercup family Ranunculaceae. The specific epithet japonica means "from Japan", which is a misnomer since the species is introduced in Japan. It is native to China, Taiwan, and Vietnam.