Rhododendron kawakamii | |
---|---|
Rhododendron kawakamii in the Jardin Botanique de Lyon, Lyon, France | |
Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Clade: | Asterids |
Order: | Ericales |
Family: | Ericaceae |
Genus: | Rhododendron |
Species: | R. kawakamii |
Binomial name | |
Rhododendron kawakamii Hayata | |
Rhododendron kawakamii is a plant endemic to Taiwan. It is also called Kawakami's rhododendron, as the type specimen was collected by Takiya Kawakami and others from Mount Niitaka (today named Yu Shan or Mount Jade). This species is the only native, epiphytic, yellow flowered rhododendron in Taiwan, and is scattered in the fog forest belt of the island at an altitude of about 1,500 to 2,500 m (4,900 to 8,200 ft). It was first published as a new species by Bunzo Hayata in 1911. The wild community was assessed as "near-threatened" in the Taiwan Red Book of Vascular Plants in 2017.
This plant is an epiphytic shrub with a height of around 30 to 130 cm (12 to 51 in). The branches are well developed, often curved, with smooth and hairless surface with glandular dots. Bud scales have a sharp tip and tiny cilia on the surface. [1]
The leaves range from 2.5 to 5 cm (0.98 to 1.97 in) long and 1.5 to 3 cm (0.59 to 1.18 in) wide, clustered, thick leathery, obovate, with a blunt or small apex. The base of the leaf is acuminate to sharp, and the leaf margin is slightly curved backward. The upper surface of the leaf is dark green, smooth and hairless, while the lower surface of the leaf is lighter in color with the middle rib and lateral veins depressed on the upper surface and raised on the lower surface. The leaf stalk is about 0.25 cm long and has wings. [1]
The inflorescence tends to have 2 to 5 flowers growing in a corymbose shape, resembling umbrella ribs. The flower stalk is approximately 2 to 2.5 cm (0.79 to 0.98 in) long, with sparse glandular dots on the surface. The calyx is five-lobed and dish-shaped. Normally, the lobes are irregular, with glandular dots and short cilia. The corolla is yellow and bell-shaped with five petals which are about 1 cm (0.39 in) long and 1 to 1.2 cm (0.39 to 0.47 in) wide. They are oval in shape with glandular dots, spirally arranged on the disk. Generally, there are 10 stamens, which vary in length. Pistils are slightly shorter than stamens. The capsules are ovoid, 0.8–1.2 cm (0.31–0.47 in) long and sparsely villous on the surface. [1]
Rhododendron kawakamii was first described by the Japanese botanist Bunzo Hayata in 1911. The specimens collected by Hayata himself, Kawakami Takiya, and Mori Ushinosuke from Yushan, Luandashan and other locations in Taiwan were published as a new species in Volume 30 of the Journal of the College of Science, Imperial University of Tokyo. In addition to describing the specimen’s morphology in detail, Hayata also discussed the similarities and differences between this species and Rhododendron emarginatum , Rhododendron anthopogonoides , and dwarf rhododendron ( Rhododendron pumilum ) from the Himalayas. However, the corolla color was not mentioned in the article. [2]
When Ryozo Kanehira published "Taiwan Tree Chronicle" in 1936, in addition to citing the results of Hayata in 1911, he also added that the flower color of this species was white to pink. [3] In 1960, Tang-Shui, Liu and Can-Yang, Chuang retained Ryozo Kanehira’s views, and treated the yellow-flowered species as a new variety of yellow-flowered rhododendron (R. kawakamii var. flaviflorum), which was later incorporated into Volume 4, Flora of Taiwan (Edition 1) in 1978. Several characteristics, including flower color, are used to distinguish the two species in the retrieval table. [4] In 1989 Sheng-You Lu and Yuen-Po Yang combined their field observations and speculated that Ryozo Kanehira’s description of the flower color of the three pairs was wrong, and there might be no other flower colors except yellow in this species. [5] Flora of Taiwan (Edition 2) in 1998 only accepted the scientific name originally published by Hayata, and clearly described the bright yellow corolla of this species, without mentioning other flower colors. [1]
This species is only found in Taiwan. Its known, recorded locations include Taiping Mountain in Yilan, Taman Mountain in Taoyuan, Yuanyang Lake area in Hsinchu, Luandashan in Nantou, Alishan in Chiayi, Dagui Lake area in Kaohsiung, Wutou Mountain in Pingtung, and Mizuho Forest Road in Hualien. The distribution locations and habitats are mostly mountain fog forests with an altitude of 1,500 to 2,500 meters. Normally, they are attached to large trees or rock walls, including to the branches of the Taiwan red cypress ( Chamaecyparis formosensis Matsum). [5]
Attempts have been made to breed this species artificially. For example, in 2018, Lei-Chen Lin team from Chiayi University in Taiwan worked with Sun-Link-Sea Forest and Nature Resort Corp., to cultivate seedlings. The seedlings were cultivated with rhododendron symbiotic bacteria. [6] Another example comes from Ya-Ling Ho and Yue-Ken Liao’s team at Chiayi University, which used plant tissue culture technology in 2020 to promote bud reproduction with growth regulators such as isopentenyl adenine, and thereby accelerate the growth rate and yield of seedlings. [7]
Salvia spathacea, the California hummingbird sage or pitcher sage, is a species of flowering plant in the family Lamiaceae, native to southern and central California growing from sea level to 610 m (2,001 ft). This fruity scented sage blooms in March to May with typically dark rose-lilac colored flowers. It is cultivated in gardens for its attractive flowering spikes and pleasant scent.
Ulmus uyematsuiHayata, commonly known as the Alishan elm, is endemic to forests at elevations of 800–2,500 metres (2,600–8,200 ft) in Alishan, Chiayi County, central Taiwan, where it is considered one of the minor tree species. The tree was first named and described by the Japanese botanist Bunzō Hayata in 1913, in the aftermath of the First Sino-Japanese War, when the Republic of Formosa was ceded to Japan.
Podocarpus nakaii is a species of conifer in the family Podocarpaceae. It is endemic to Taiwan, scattered in broad-leaf forests in the central part of this island. Ponesterone, which is similar to insect's moulting hormone ecdysone, is obtained from this plant. It was the first ecdysone isolated by Nkanishi et al.
The flora of Taiwan is rich and varied due to the island's diverse geography and climate zones. The main island is situated on the Tropic of Cancer between China and the Philippine Sea basin. There are mountains in the east, running north and south on two-thirds of the island, with many peaks over 10,000 feet in elevation, and lower, flatter, and more fertile land to the west. The tropical climate, plentiful rainfall, and wide altitudinal range make for abundant and varied vegetation. Taiwan is home to over 4300 species of vascular plants, of which it is estimated that 600 are ferns, 28 are gymnosperms, 2400 are dicots, and 1000 are monocots.
Pyrenaria buisanensis is a species of tea endemic to Taiwan. It was first described by the Japanese botanist S. Sasaki in 1931, but the herbarium specimens were lost and the species identity remained dubious until a 2004 publication that reported its rediscovery and reclassified it as a species of Pyrenaria. Its status remains controversial, with some sources including it in Pyrenaria microcarpa as P. microcarpa var. ovalifolia.
Acer kawakamii is an Asian species of maple, found only in Taiwan. The species is sometimes confused with another Taiwanese tree, Acer morrisonense. This species has been known to reach 20 metres tall. Leaves are non-compound, the blade narrowly ovate, up to 11 cm long by 4.5 cm wide, with serrate margins but no lobes.
North American azaleas are flowering shrubs in the genus Rhododendron, section Pentanthera, subsection Pentanthera, so named because they all have five stamens. Most are in the United States, with one species found in Canada and one being found in Mexico. North American azaleas are commonly confused with azaleas of Asian origin, the evergreen azaleas. North American azaleas are deciduous and produce two types of buds. One is a larger and produces about 20 flowers while the other bud produces a leafy shoot. The flower color, fragrance, and number of stamens vary among species.
Ilex asprella, also known as rough-leaved holly and plum-leaved holly, is a deciduous shrub native in South East Asia. Ilex asprella is one of the few deciduous species in the family Aquifoliaceae.
Hibiscus taiwanensis, or the Taiwan cotton rose, is a native plant in Taiwan, which lives in China and low altitude in Taiwan. It is a species of plant in the Malvaceae family. The form of flower is different from Hibiscus mutabilis in China, which is double. It can attract butterflies.
Sorbus randaiensis is a species of deciduous tree in the family Rosaceae. It is endemic to the mountain areas of central Taiwan, with altitude 1,800m to 3,200m, mostly spotted in the forest of Xueshan, Hehuan Mountain, Mount Xiluan, and Nenggao Mountain. It is a tree 3–8 m tall with white flowers and reddish fruit.
Berberis morrisonensis, commonly known as Yushan barberry (Chinese:玉山小檗) or red fruit barberry (Chinese:红果小蘖、赤果小蘖) is a perennial deciduous shrub belonging to the genus Berberis and endemic to Taiwan.
Rhododendron pachysanthum, the thick-flowered rhododendron, is a species of flowering plant in the heath family Ericaceae, that is native to Taiwan. It is an evergreen shrub growing to 2.5 m (8.2 ft) tall and broad. This species is particularly noted for its 9 cm (3.5 in) leaves, which may be heavily felted on both surfaces, red above and brown beneath. In early spring, trusses of pale pink flowers appear, spotted crimson on the inner surface.
Stachys stebbinsii is a species of perennial herb in the mint family commonly known as Stebbins' hedgenettle. This plant is characterized by a musky aroma, flowers with large lower lips, and glandular hairs that densely cover the stems. S. stebbinsii is native to California and northwestern Baja California. It is usually found growing in moist places in a wide variety of habitats including disturbed areas, chaparral, coastal sage scrub and mountains.
Piper kawakamii, also known as the Kawakamii pepper, is a flowering plant in the family Piperaceae. It is a native endemic species in Taiwan. The plant is mainly distributed in the Hengchun Peninsula. It was collected by Takiya Kawakami at the Kuraru Community, on July 2, 1906. In 1911, the plant was published by Bunzō Hayata as a new species. The type specimen of this plant is being preserved in the Botanical Gardens, Graduate School of Science, the University of Tokyo, Japan.and the Herbarium of Taiwan Forest Research Institute
Lonicera kawakamii, also known as Yushan honeysuckle or Kawakami’s honeysuckle, is a species of flowering plant in the family Caprifoliaceae. It is endemic to Taiwan, where it is found at altitudes between 3000 and 3900 meters. It as rated as “Vulnerable” in the “Red List of Vascular Plants of Taiwan, 2017”.
Rubus swinhoei is also known as Swinhoe's raspberry, wood berry, Keelung rubus, Jingbai rubus and Libai rubus. It belongs to the genus Rubus of the family Rosaceae and is named after Robert Swinhoe for his contributions to Taiwan’s fauna and flora.
Youngia japonica subsp. formosana is an endemic subspecies of Youngia japonica in Taiwan. It is often confused with another endemic subspecies of Youngia, Y. japonica subsp. monticola. Collection records of this species dated back to 1906, but its taxonomy rank was not clarified until 2012. It is now known that this species is distributed primarily in the western coastline of Kaohsiung’s Shou-shan Mountain, Chihou Mountain and Liuqiu Island of Pingtung. The species normally grows on coastal coral-reef limestone rocks, and is morphologically distinctive from other subspecies by having a smaller plant, thicker and velvet-like textured leaves, and reddish-brown colored achene. The 2017 Red List of Vascular Plants in Taiwan evaluated the threat level of this species as “Least Concern” (LC).
Artemisia kawakamii, commonly known as Kawakami's mugwort, is a plant in the Artemisia genus under the Asteraceae family that is endemic to Taiwan. The plant is distributed on the Taiwan island, growing at elevations from 2,700 to 3,300 m. It is commonly found in gravelly, open, and arid slopes. The species has yet to be cultivated.
Sedum sekiteiense is a Taiwan-endemic species of the family Crassulaceae in the Sedum genus. It is also one of the few wild plants named after Shiding. The species was first published by Yoshimatsu Yamamoto in 1934 in the Supplementa Iconum Plantarum Formosanarum. Although its taxonomic status has been stable, little is known about its ecological habits due to its rarity, limited distribution, and habitats that are often located on steep and inaccessible cliffs that are difficult to observe. The species is classified as “Vulnerable (VU)” in “The Red List of Vascular Plants of Taiwan, 2017.”
Syneilesis hayatae is one of two Taiwanese endemic plants in the genus Syneilesis, it is known as the Taiwan rabbit umbrella. Compared to the relatively stable population of Syneilesis subglabrata, this species was once thought to be extinct due to the lack of collection records for over half a century after World War II. In 2008 that the species was rediscovered in the lowland grasslands of Miaoli. Due to its small population size, the species was listed as “Critically Endangered (CR)” in the “Red List of Taiwan Vascular Plants, 2017.”