Toxicodendron rydbergii

Toxicodendron rydbergii, the western poison ivy,[2] is a species of Toxicodendron in the cashew family. It is native to most of Canada from the Maritimes to British Columbia, and most of the contiguous United States except the southeastern states, New Jersey, Delaware, and California.[3] It can be found growing in forests, and other wooded areas, usually near streams and rivers.[4]

Toxicodendron rydbergii
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Sapindales
Family: Anacardiaceae
Genus: Toxicodendron
Species:
T. rydbergii
Binomial name
Toxicodendron rydbergii
Synonyms[1]
  • Rhus rydbergii Small ex Rydb.
  • Rhus radicans var. rydbergii (Small ex Rydb.) Rehder
  • Rhus toxicodendron var. rydbergii (Small ex Rydb.) Garrett
  • Toxicodendron radicans subsp. rydbergii (Small ex Rydb.) Á. Löve & D. Löve
  • Toxicodendron radicans var. rydbergii (Small ex Rydb.) Erskine

Unlike Toxicodendron radicans (eastern poison ivy), which often appears as a trailing or climbing vine, Toxicodendron rydbergii is a shrub that can grow to 1 m (3 ft) tall, rarely up to 3 m (10 ft). The leaves are trifoliate and alternate. The leaflets are variable in size and shape, and are usually 15 cm (6 in) long, turning yellow or orange in autumn. On the compound trifoliate leaves, the two leaflets opposite each other are typically asymmetrical, in contrast to the terminal leaflet which always shows bilateral symmetry. The fruits are small, round, and yellowish.[4][5]

Poison Ivy berries on a dormant plant in the Wasatch Mountains. Utah, United States.

Caution

All parts of this plant contain urushiol, which can cause severe contact dermatitis in most individuals.

References
  1. "Toxicodendron rydbergii". Tropicos. Missouri Botanical Garden.
  2. "Toxicodendron rydbergii". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 11 December 2015.
  3. "Toxicodendron rydbergii". County-level distribution map from the North American Plant Atlas (NAPA). Biota of North America Program (BONAP). 2014.
  4. Innes, Robin J. (2012). "Toxicodendron radicans, T. rydbergii". Fire Effects Information System (FEIS). US Department of Agriculture (USDA), Forest Service (USFS), Rocky Mountain Research Station, Fire Sciences Laboratory – via https://www.feis-crs.org/feis/.
  5. Rydberg, Per Axel 1900. Memoirs of The New York Botanical Garden 1: 268–269 Archived 2018-08-07 at the Wayback Machine as Rhus rydbergii
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