Taxon: Toxicodendron rydbergii (Small ex Rydb.) Greene

Summary

Genus:

Toxicodendron

Family:

Anacardiaceae

Subfamily:

Anacardioideae

Nomen number:

409811

Place of publication:

Leafl. Bot. Observ. Crit. 1:117. 1905

Verified:

01/22/1998 ARS Systematic Botanists.

Accessions:

0 (0 active, 0 available) in National Plant Germplasm System.

Other conspecific taxa

Autonyms (not in current use), synonyms and invalid designations

Basionym
Rhus rydbergii Small ex Rydb.

Homotypic Synonym(s)
Rhus radicans L. var. rydbergii (Small ex Rydb.) Rehder

No images

Conservation Status

Reference(s)

Allred, Kelly W. 2008. Flora Neomexicana I: The vascular plants of New Mexico, an annotated checklist to the names of vascular plants with synonymy and bibliography.
Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
Lampe, K. F. & M. A. McCann. 1985. AMA handbook of poisonous and injurious plants Note: as Rhus rydbergii
2018. Oklahoma vascular plant database

Common names

Language	Name	Alternate name	note	seq	Citation
English	Rydberg's poison-ivy			1	Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.

Distribution

order_code	Status	Continent	Subcontinent	Country	State	Note	Reference
1	Native	Northern America	Eastern Canada	Canada	New Brunswick		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Eastern Canada	Canada	Nova Scotia		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Eastern Canada	Canada	Ontario	s.	Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Eastern Canada	Canada	Prince Edward Island		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Eastern Canada	Canada	Québec	s.	Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	North-Central U.S.A.	United States	Illinois	n.	Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	North-Central U.S.A.	United States	Iowa		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	North-Central U.S.A.	United States	Kansas		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	North-Central U.S.A.	United States	Minnesota		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	North-Central U.S.A.	United States	Nebraska		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	North-Central U.S.A.	United States	North Dakota		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	North-Central U.S.A.	United States	Oklahoma		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	North-Central U.S.A.	United States	South Dakota		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	North-Central U.S.A.	United States	Wisconsin		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Northeastern U.S.A.	United States	Indiana	n.	Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Northeastern U.S.A.	United States	Maine		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Northeastern U.S.A.	United States	Massachusetts		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Northeastern U.S.A.	United States	Michigan		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Northeastern U.S.A.	United States	New Hampshire		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Northeastern U.S.A.	United States	New York		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Northeastern U.S.A.	United States	Ohio	n.	Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Northeastern U.S.A.	United States	Pennsylvania		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Northeastern U.S.A.	United States	Vermont		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Northeastern U.S.A.	United States	West Virginia		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Northwestern U.S.A.	United States	Colorado		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Northwestern U.S.A.	United States	Idaho		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Northwestern U.S.A.	United States	Montana		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Northwestern U.S.A.	United States	Oregon		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Northwestern U.S.A.	United States	Washington		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Northwestern U.S.A.	United States	Wyoming		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	South-Central U.S.A.	United States	New Mexico		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	South-Central U.S.A.	United States	Texas		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Southeastern U.S.A.	United States	Virginia	w.	Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Southwestern U.S.A.	United States	Arizona		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Southwestern U.S.A.	United States	Utah		Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Western Canada	Canada	Alberta	s.	Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Western Canada	Canada	British Columbia	s.e.	Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Western Canada	Canada	Manitoba	s.	Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.
1	Native	Northern America	Western Canada	Canada	Saskatchewan	s.	Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.

Native
Northern America

EASTERN CANADA: Canada [Québec (s.), Nova Scotia, Ontario (s.), Prince Edward Island, New Brunswick]
WESTERN CANADA: Canada [Saskatchewan (s.), Alberta (s.), Manitoba (s.), British Columbia (s.e.)]
NORTHEASTERN U.S.A.: United States [Indiana (n.), Maine, Massachusetts, Michigan, New Hampshire, New York, Ohio (n.), Pennsylvania, Vermont, West Virginia]
NORTH-CENTRAL U.S.A.: United States [Illinois (n.), Iowa, Kansas, Minnesota, Nebraska, North Dakota, Oklahoma, South Dakota, Wisconsin]
NORTHWESTERN U.S.A.: United States [Colorado, Idaho, Montana, Oregon, Washington, Wyoming]
SOUTHEASTERN U.S.A.: United States [Virginia (w.)]
SOUTH-CENTRAL U.S.A.: United States [New Mexico, Texas]
SOUTHWESTERN U.S.A.: United States [Arizona, Utah]

Reference(s)

Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae). Rhodora 73:38.

Economic Uses

Usage	Type	Note	Reference
Vertebrate poisons	mammals		Lampe, K. F. & M. A. McCann. 1985. AMA handbook of poisonous and injurious plants Note: as Rhus rydbergii

Cite as: USDA, Agricultural Research Service, National Plant Germplasm System. 2026. Germplasm Resources Information Network (GRIN Taxonomy). National Germplasm Resources Laboratory, Beltsville, Maryland.
URL: https://npgsweb.ars-grin.gov/gringlobal/taxon/taxonomydetail?id=409811. Accessed 28 October 2026.