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(First upload on December 3 2003. Last on August 6 2022) [ 日本語 | English ]

Rhus L. (ウルシ, poison oak)

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There are three (four) species in Hokkaido R. ambigua Lavall. ex Dippel (ツタウルシ) = T. orientale R. javanica L., pro. p. (ヌルデ) (s.l.) R. succedanea L. (ハゼノキ) = T. succedaneum (L.) Kuntze R. sylvestris Sieb. et Zucc. (ヤマハゼ) = T. sylvestre (Siebold et Zucc.) Kuntze

R. trichocarpa Miquel (ヤマウルシ) = T. trichocarpum R. verniciflua Stockes (ウルシ), introduced = T. vernicifluum (Stokes) F. A. Barkley = Toxicodendron Mill when separated from Rhus

Rhus trichocarpa in Hokkaido

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Yama-urushi (ヤマウルシ, 山漆), Japanese sumac Lifeform: deciduous short-tree Distribution: China - Korea - southern Sakhalin - Japan Seed dispersal: animals, in particular, Jungle Crow (Corvus macrorhynchos on Mount Koma (Nishi & Tsuyuzaki 2004)

Synonyms Toxicodendron trichocarpum (Miquel) Kuntze f. viridis Hara (アオヤマウルシ)

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[1/2] in Shizukari wetland, southern Hokkaido, on June 15 2015. [3] on the southwest slope of Mount Koma on June 20 2022. [4] in the Forest of Hokkaido People (道民の森), 3rd River, Kamui-jiri, Aoyama, Tobetsu Town, on July 18 2022.

Mount Koma

1 2 3	1. Seedlings colonized near rocks at 600 m in elevation. 2. Saplings established on a bareland enclosed by the shrub patches of Salix reinii and Gaultheria miqueliana. 3. A fruting tree in a secondary forest at 350 m in elevation (1-5, October 2002)
4 5 6	4. See photo 3. 5. Fruits on the crown throughout winter by aerial seedbank (林冠種子貯蔵) in a secondary forest at 350 m elevation. 6. The fruits soon after ripening become dry and the surface layer is removed. The seed is covered somewhat with wax.
7 8 9	7. A tree with numerous fruits in a secondary forest at 350 m elevation on October 2002. 8. Leaves becoming red earlier than any other broad-leaved trees. Compare to mountainash at the right. 9. R. trichocarpa seedlings at the base of poplar (August 2003).
10 11	10. The colonization of seedlings and saplings under a Populus maximowiczii of which height is ca 6 m, before the marking of individuals. 11. To monitor seedlings, numbered tape was tagged on each individual. H. Nishi took all pictures.