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Toxicodendron rydbergii, the
western poison ivy or
northern poison oak, is a
species of
Toxicodendron in the
cashew family native to
North America. As...
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generally treated as a
complex of
three separate species: T. radicans, T.
rydbergii, and T. orientale. They are well
known for
causing urushiol-induced contact...
- Anacardiaceae. It is
different from
western poison ivy,
Toxicodendron rydbergii, and
resembles a
number of species. The
species is
found in
North America...
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Penstemon rydbergii,
commonly known as Rydberg's
penstemon or
meadow penstemon, is a
perennial plant in the
plantain family (Plantaginaceae) that grows...
- name
Viola canadensis L.
Synonyms Lophion canadense (L.)
Spach Lophion rydbergii (Greene) Nieuwl. &
Lunell Viola geminiflora Greene Viola muriculata Greene...
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Arnica rydbergii is a
North American species of
flowering plant in the
family Asteraceae,
known by the
common name Rydberg's
arnica or
subalpine arnica...
- Ming & Z.F.Chen – southern
Yunnan Toxicodendron rydbergii (Small ex Rydb.)
Greene (synonym Rhus
rydbergii) – Western
poison ivy is
found in
northern parts...
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Contributions from the
United States National Herbarium 25: 545 as
Aplopappus rydbergii The
Plant List,
Ericameria obovata (Rydb.) G.L.Nesom NRCS. "Ericameria...
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Rockies Arnica porsildiorum—Kamchatka,
Yukon Northwest Territories Arnica rydbergii—Rydberg arnica, Rydberg's arnica,
subalpine arnica—British Columbia, Alberta...
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subspecies is
presumed to be
extinct since 1937.
Helianthus nuttallii subsp.
rydbergii (Britton) R. Long. -
Central Canada,
interior northwestern United States...
