(First upload on September 2 2007. Last on October 31 2015) [ 日本語 | English ]

Rhus ambigua Lavall. ex Dipp.

Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily

Rhus L. (ウルシ)
Tsutaurushi (ツタウルシ, 蔦漆), climbing sumac
Lifeform: deciduous vine
Habitat: woodland, forest edge, gap
Poison: inflammation of the skin by urushiol
Urushiol: R =

(CH2)14CH3, (CH2)7CH=CH(CH2)5CH3
and others

Chromosome number: 2n = 30

→ Introduction to the Ozone Depletion and the Effects of UV Radiation (自然環境学総論)


Rhus orientalis (Greene.) C. Schneid.
Rhus toxicodendron hispida Engl.
Toxicodendron orientale Greene

f. rishiriensis (Nakai) Hara (リシリツタ): erect < 2 m in height, non-vine

Rhus ambigua in Hokkaido

Rhus1 Rhus2 Rhus3

Rhus4 Rhus5 Rhus6


Rhus7 Rhus8
[1] at the Tomakomai Experimental Forest of Hokkaido University on May 21 2003. [2/3] at the entrance gate of Shinsen Bog, central Hokkaido, on June 24 2007. [4-5] at the formerly Senjaku Course in Teine Skislope on October 5 2009. [6] at a footpath around Onnenai Visitor Center in Kushiro Moor, eastern Hokkaido, on July 2 2014. The leaf shape is highly variable. [7/8] near the parking lot of Mount Koma (flora), southern Hokkaido, on August 4 2015.