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Tsuga diversifolia

Tsuga diversifolia, Photo: Michael Lahanas

Superregnum: Eukaryota
Regnum: Plantae
Divisio: Tracheophyta
Divisio: Pinophyta
Classis: Pinopsida
Ordo: Pinales

Familia: Pinaceae
Genus: Tsuga
Species: Tsuga diversifolia

Tsuga diversifolia (Maxim.) Mast., J. Linn. Soc., Bot. 18: 514 (1881).
Native distribution areas:

Eastern Asia

Tsuga diversifolia

Tsuga diversifolia, Photo: Michael Lahanas

References: Brummitt, R.K. 2001. TDWG – World Geographical Scheme for Recording Plant Distributions, 2nd Edition

Govaerts, R. et al. 2021. Tsuga diversifolia in World Checklist of Selected Plant Families. The Board of Trustees of the Royal Botanic Gardens, Kew. Published online. Accessed: 2021 March 7. Reference page.
International Plant Names Index. 2021. Tsuga diversifolia. Published online. Accessed: 7 March 2021.

Vernacular names
English: Northern Japanese Hemlock
Esperanto: Diversfolia cugo
suomi: Japaninhemlokki
日本語: コメツガ
lietuvių: Įvairiaspyglė cūga
Türkçe: Kuzey Japon sugası

Tsuga diversifolia, commonly known as the northern Japanese hemlock, or in Japanese, kometsuga (米栂), is a species of conifer native to the Japanese islands of Honshū, Kyūshū, and Shikoku. In Europe and North America, the species is sometimes employed as tree for the garden and has been in cultivation since 1861.


Tsuga diversifolia is an evergreen tree that attains heights of 25 m (80 feet). The crown is narrow, dense and conical. Young shoots are short, palely pubescent and bright orange to red-brown in colour. The densely arranged needles are linear-oblong and 5 to 15 mm long and up to 2.4 mm wide. They are a dark green in colour, glossy and furrowed above with two chalk white stomatal bands below.[2]

The bark is an orange-brown in colour, shallowly fissured and vertically peeling. The buds are a deep purple red. The dull purple, ovoid pistillate flowers are terminal on either long or short shoots. They measure about 5 mm and as they mature become pale green with the centre and margin of each scale being purple. The cones are 1.8 to 2.8 cm long, cylindric-ovoid, and nearly sessile. They are dark brown, pendulous and the scales are slightly convex and ridged.[3]

Katsuki, T. & Luscombe, D. (2013). "Tsuga diversifolia". The IUCN Red List of Threatened Species. IUCN. 2013: e.T42433A2979949. doi:10.2305/IUCN.UK.2013-1.RLTS.T42433A2979949.en. Retrieved 15 December 2017.
Breen, Patrick (1999–2007). "Tsuga diversifolia". Landscape Plants: Images, Identification, and Information. Oregon State University. Retrieved 2007-05-12.
Mitchell, Alan (1974). Trees of Britain & Northern Europe. London: Harper Collins Publishers. p. 146. ISBN 0-00-219213-6.

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