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

Familia: Cupressaceae
Subfamilia: Cupressoideae
Genus: Thujopsis
Species: T. dolabrata

Thujopsis Siebold & Zucc. ex Endl., Gen. Pl., Suppl. 2: 24 (1842), nom. cons.

monotypic taxon


Dolophyllum Salisb., Quart. J. Sci. Lit. Arts 2(4): 313 (1817), nom. rej.


Siebold, P.F. von & Zuccarini, J.G. 1842. Genera Plantarum (Endlicher) 2: 24.
Govaerts, R. et al. 2017. Thujopsis in World Checklist of Selected Plant Families. The Board of Trustees of the Royal Botanic Gardens, Kew. Published online. Accessed: 2017 Feb. 25. Reference page.
International Plant Names Index. 2017. Thujopsis. Published online. Accessed: Feb. 25 2017.
Tropicos.org 2017. Thujopsis. Missouri Botanical Garden. Published online. Accessed: 25 Feb. 2017.

Vernacular names
dansk: Hønsebenstræ
Deutsch: Hiba-Lebensbaum
English: Hiba, False Arborvitae, Hiba Arborvitae
Esperanto: Hiba
日本語: ヒバ
português: Thujopsis
Türkçe: Yalancı mazı

Thujopsis (/θjuːˈdʒɒpsɪs/)[citation needed] is a genus of conifers in the cypress family (Cupressaceae), the sole member of which is Thujopsis dolabrata. It is endemic to Japan, where it is named asunaro (あすなろ). It is similar to the closely related genus Thuja (arborvitae), differing in the broader, thicker leaves and thick cones. It is also called hiba,[2] false arborvitae, or hiba arborvitae.

A popular allegory for the meaning behind asunaro is asu wa hinoki ni narou (明日はヒノキになろう), literally "tomorrow it will become a hinoki cypress", i.e. the tree looks like a smaller version of the common hinoki cypress.[citation needed] In Japan, other than being called asunaro, it also goes by the name hiba (ひば). There are also a few regional variations, with asunaro being called ate (貴, 阿天) in Ishikawa, and atebi on Sado island.[citation needed]

Thujopsis is a medium to large evergreen tree, reaching up to 40 m tall and 1.5 m trunk diameter, with red-brown bark which peels in vertical strips. The leaves are arranged in decussate pairs, scale-like, 3–10 mm long, glossy green above, and marked with vivid white stomatal bands below; they have a distinctive thick, almost fleshy texture. The seed cones are ovoid, 7–15 mm long and 6–10 mm diameter, with 6–12 thick scales, brown with a violet-white wax bloom when fresh.

There are two varieties:

Thujopsis dolabrata var. dolabrata. Central and southern Japan. Shoots less densely branched with slightly larger leaves, and strongly thickened cone scales.
Thujopsis dolabrata var. hondai. Northern Japan. Shoots more densely branched with slightly smaller leaves, and less thickened cone scales.


The asunaro is a valued ornamental tree both in its native Japan, where it is commonly planted around temples as well as in gardens, and also in Europe and North America. In the latter two regions, planting is confined to areas with good rainfall or in gardens with reliable irrigation, as the species is not drought tolerant. In the UK has gained the Royal Horticultural Society's Award of Garden Merit.[3][4]

It is also used to a small extent in forestry in Japan, grown for the valuable wood, which is durable and scented, similar to that of Thuja plicata.

Upper side of shoot, lower side of shoot, mature cones


Young plant

Wikimedia Commons has media related to Thujopsis dolabrata.
Wikispecies has information related to Thujopsis.

Carter, G. (2013). "Thujopsis dolabrata". IUCN Red List of Threatened Species. 2013: e.T42265A2968270. doi:10.2305/IUCN.UK.2013-1.RLTS.T42265A2968270.en. Retrieved 12 November 2021.
BSBI List 2007 (xls). Botanical Society of Britain and Ireland. Archived from the original (xls) on 26 June 2015. Retrieved 17 October 2014.
"Thujopsis dolabrata AGM". Royal Horticultural Society. Retrieved 12 March 2021.

"AGM Plants - Ornamental" (PDF). Royal Horticultural Society. July 2017. p. 102. Retrieved 23 December 2018.

Dictionary.goo.ne.jp - あすなろ

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