Acer kawakamii
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| Acer kawakamii | |
|---|---|
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Sapindales |
| Family: | Sapindaceae |
| Genus: | Acer |
| Section: | Acer sect. Macrantha |
| Species: | A. kawakamii
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| Binomial name | |
| Acer kawakamii Koidzumi, 1911
| |
Acer kawakamii is a species of Asian maple and a plant endemic to Taiwan that bears mature fruits with sickle-shaped wings. It belongs to the family Sapindaceae (formerly Aceraceae) and the genus Acer.
Description
This deciduous tree that can reach up to 20 m (66 ft) in height and has thin, glabrous branches. Its leaves are opposite, chartaceous, simple, ovate or ovate-elliptic, 6–10 cm (2.4–3.9 in) in length, and 3–5 cm (1.2–2.0 in) in width. The leaf base is rounded or slightly cordate with finely serrated margins, usually unlobed or shallowly 3-lobed, rarely conspicuously 3-5 lobed. Apex is caudate-acuminate. The adaxial surface of the leaf blade is green while the abaxial surface is light green. Unisexual flowers, monoecious; raceme inflorescence with either glabrous or short pubescence, approximately 5 cm (2.0 in) in length. Flowers are approximately 9 to 10 mm (0.35 to 0.39 in) in width, slender, and glabrous. Calyx has 5 ovate-lanceolate-shaped sepals and is glabrous. 5 White rhomboid petals with undulating margins. The floral disk is thick and shallowly 8-lobed. The pistil of the female flower has a distinct carpel, the ovary has a wing-like structure. The style is 2-fid, connate at the base and curved downward at the apex. The staminodes are about 2 mm (0.079 in) in length. The male flower has 8 stamens surrounding the floral disk, with filaments about 3 mm (0.12 in) in length. The staminodes are approximately 2 mm (0.079 in) in length. The male flower has 8 stamens surrounding the floral disk, with filaments approximately 3 mm (0.12 in) in length. The male flower has 8 stamens surrounding the floral disk, with filaments approximately 3 mm (0.12 in) in length. The mature samara is yellowish brown in color with sickle-shaped wings approximately 3 cm (1.2 in) in length. The angle between the two wings at the lower margin is approximately 120-130 degrees.[1]
Distribution and habitat
This species is endemic to Taiwan. It mainly grows at mid to high altitudes in the forests of the Central Mountain Range, often mixed with hinoki cypress in the cloud zone. It is naturally distributed in the Yangmingshan in northern Taiwan at elevations of 650-900 meters.[2][3][4]
Taxonomy
This species was first named by Genichi Koidzumi in 1911[5] and was subsequently described and illustrated in later academic articles. No formal holotype was cited; the only mention was that the type specimen was collected from the temperate forest in Mt. Hakkutisan in Alishan.[6] According to a study conducted by Chien-Yu Tseng in 2007, the selected type specimen (DB No. 01924) currently preserved in the University of Tokyo may likely be the species identified by Genichi Koidzumi. Due to the significant morphological variation, particularly in the number of leaf lobes and morphology, the species has been differentiated into different subspecies or varieties. Therefore, because of the difficulty in determining these characteristics, Tseng has suggested listing the species as a single species.[4]
Reference
- ^ Li, Hui-Lin; Lo, Hann-Chung (1993). Aceraceae. Flora of Taiwan vol. 3 (2nd ed.). Taipei, Taiwan, ROC: Editorial Committee of the Flora of Taiwan, Lungwei Printing Company, Ltd. pp. 591, 593.
- ^ Koidzum, Gen'ichi (1911). "Observations on the Aceraceae". Botanical Magazine. 25: 102.
- ^ Koidzumi, Gen'ichi. (1911). "Revisio Aceracearum Japonicarum". The Journal of the College of Science, Imperial University of Tokyo. 32 (1): 402.
- ^ a b 曾, 千育 (2007). 臺灣地區槭樹屬植物之分類研究─以外部形態與分子證據探討 (in Chinese). 新竹: 國立新竹教育大學碩士論文. pp. 31–65.
- ^ Koidzum, Gen'ichi. "Observations on the Aceraceae". Botanical Magazine. 25. Tokyo Botanical Society: 102.
- ^ Koidzumi, Gen'ichi (1911). "Revisio Aceracearum Japonicarum". The Journal of the College of Science, Imperial University of Tokyo, Japan. 32 (1). The University of Tokyo: 402.