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Species Details
Streptopus amplexifolius (L.) DC.
University of Alberta Vascular Plant Herbarium Read more about this collection »
LeavesLance-shaped; 4-12 cm long and 1-6 cm wide; heart-shaped at base and clasping; bluish-green beneath; margin entire or toothed (Moss, 1983). No basal leaves (E-Flora BC).
FlowersAxillary; solitary or in pairs; stalks jointed; tepals whitish-green; 8-12 mm long; tip bent backwards from cup-shaped base; ; lance-shaped; stamens short filaments; ovary 3-4 mm long; stigma slightly 3-lobed (Moss, 1983).
Fruits and SeedsRed berry; round; 1-1.5 cm wide; inedible; several seeds (Moss, 1983).
Scientific Name
Streptopus amplexifolius (L.) DC.
Common Name
twisted stalk
General Description
A perennial herb that develops from a thick rhizome; the stalk is 30-100 cm high; hairy below the first branches, can be branched or unbranched and bears greenish-white flowers (Moss, 1983).
Leaves
Lance-shaped; 4-12 cm long and 1-6 cm wide; heart-shaped at base and clasping; bluish-green beneath; margin entire or toothed (Moss, 1983). No basal leaves (E-Flora BC).
Flowers
Axillary; solitary or in pairs; stalks jointed; tepals whitish-green; 8-12 mm long; tip bent backwards from cup-shaped base; ; lance-shaped; stamens short filaments; ovary 3-4 mm long; stigma slightly 3-lobed (Moss, 1983).
Fruits and Seeds
Red berry; round; 1-1.5 cm wide; inedible; several seeds (Moss, 1983).
Phenology
March to August (JSTOR).
Notes
2n=16, 32 (Moss, 1983) Three varieties are known in this region: Streptopus amplexifolius var. americanus, Streptopus amplexifolius var. denticulatus, Streptopus amplexifolius var. chalazatus (Moss, 1983).
2n=16, 32 (Moss, 1983) Three varieties are known in this region: Streptopus amplexifolius var. americanus, Streptopus amplexifolius var. denticulatus, Streptopus amplexifolius var. chalazatus (Moss, 1983).
Range/Distribution
Alberta: SW along mountains and central (Canadensys). CAN (BC, SK, MB, ON, QC, NL, NS, NB, PE, YT, NT); USA (AK, WA, CA, OR, ID, MT, WY, UT, CO, AZ, NM, SD, MN, WI, MI, TN, NC, VA, MD, PA, NJ, NY, CT, MA, VT, ME, NH) (USDA).
Citation
Page Citation for Streptopus amplexifolius (L.) DC.
Page Citation
"Species Details - Streptopus amplexifolius (L.) DC., University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search-test.museums.ualberta.ca/g/1-3921/12-5058. Accessed 09 Oct. 2025.
Specimen Information
There are 68 specimens of this Species.
30418 - Streptopus amplexifolius (L.) DC.
University of Alberta Vascular Plant Herbarium
Common Nametwisted stalk
Place CollectedNorth America: Canada, Alberta, Fox Creek
Date Collected1970-09-04
79580 - Streptopus amplexifolius (L.) DC.
University of Alberta Vascular Plant Herbarium
Common Nametwisted stalk
Place CollectedNorth America: Canada, Alberta, Kananaskis Country, Peter Lougheed Provincial Park, Boulton Creek
Date Collected1977-07-22
44775 - Streptopus amplexifolius (L.) DC.
University of Alberta Vascular Plant Herbarium
Common Nametwisted stalk
Place CollectedNorth America: Canada, Alberta, Iosegun River
Date Collected1973-07-12
71810 - Streptopus amplexifolius (L.) DC.
University of Alberta Vascular Plant Herbarium
Common Nametwisted stalk
Place CollectedNorth America: Canada, Alberta, Kananaskis Country, Peter Lougheed Provincial Park, King Creek
Date Collected1974-06-26
57523 - Streptopus amplexifolius (L.) DC.
University of Alberta Vascular Plant Herbarium
Common Nametwisted stalk
Place CollectedNorth America: Canada, Alberta, Porcupine Hills
Date Collected1971-07-29
75086 - Streptopus amplexifolius (L.) DC.
University of Alberta Vascular Plant Herbarium
Common Nametwisted stalk
Place CollectedNorth America: Canada, Alberta, Whitehorse Wildland Park, Prospect Mountain
Date Collected1976-08-03
72598 - Streptopus amplexifolius (L.) DC.
University of Alberta Vascular Plant Herbarium
Common Nametwisted stalk
Place CollectedNorth America: Canada, Alberta, Ram Range
Date Collected1974-08-03
81729 - Streptopus amplexifolius (L.) DC.
University of Alberta Vascular Plant Herbarium
Common Nametwisted stalk
Place CollectedNorth America: Canada, Alberta, Two Lakes
Date Collected1979-07-18
39895 - Streptopus amplexifolius (L.) DC.
University of Alberta Vascular Plant Herbarium
Common Nametwisted stalk
Place CollectedNorth America: Canada, Alberta, Swan Dive Tower
Date Collected1968-08-07
40717 - Streptopus amplexifolius (L.) DC.
University of Alberta Vascular Plant Herbarium
Common Nametwisted stalk
Place CollectedNorth America: Canada, Alberta, Iosegun River
Date Collected1971-06-29
55337 - Streptopus amplexifolius (L.) DC.
University of Alberta Vascular Plant Herbarium
Common Nametwisted stalk
Place CollectedNorth America: Canada, Alberta, Goose Mountain Lookout Tower
Date Collected1972-08-16
55338 - Streptopus amplexifolius (L.) DC.
University of Alberta Vascular Plant Herbarium
Common Nametwisted stalk
Place CollectedNorth America: Canada, Alberta, Goose Mountain Lookout Tower
Date Collected1972-07-11
55404 - Streptopus amplexifolius (L.) DC.
University of Alberta Vascular Plant Herbarium
Common Nametwisted stalk
Place CollectedNorth America: Canada, Alberta, Marten Hills Gas Plant Road
Date Collected1971-07-15
71599 - Streptopus amplexifolius (L.) DC.
University of Alberta Vascular Plant Herbarium
Common Nametwisted stalk
Place CollectedNorth America: Canada, Alberta, Flat Top Lookout Tower
Date Collected1974-07-17
55508 - Streptopus amplexifolius (L.) DC.
University of Alberta Vascular Plant Herbarium
Common Nametwisted stalk
Place CollectedNorth America: Canada, Alberta, Gregoire Lake Provincial Park
Date Collected1975-08-25
74062 - Streptopus amplexifolius (L.) DC.
University of Alberta Vascular Plant Herbarium
Common Nametwisted stalk
Place CollectedNorth America: Canada, Alberta, Marten Mountain
Date Collected1977-07-31
84485 - Streptopus amplexifolius (L.) DC.
University of Alberta Vascular Plant Herbarium
Common Nametwisted stalk
Place CollectedNorth America: Canada, Alberta, Marten Mountain
Date Collected1978-06-09
55336 - Streptopus amplexifolius (L.) DC.
University of Alberta Vascular Plant Herbarium
Common Nametwisted stalk
Place CollectedNorth America: Canada, Alberta, Whitecourt Mountain
Date Collected1972-08-02
55331 - Streptopus amplexifolius (L.) DC.
University of Alberta Vascular Plant Herbarium
Common Nametwisted stalk
Place CollectedNorth America: Canada, Alberta, Goose Mountain Lookout Tower
Date Collected1972-07-03
25936 - Streptopus amplexifolius (L.) DC.
University of Alberta Vascular Plant Herbarium
Common Nametwisted stalk
Place CollectedNorth America: Canada, Alberta, Whitecourt Mountain
Date Collected1960-06-12
28771 - Streptopus amplexifolius (L.) DC.
University of Alberta Vascular Plant Herbarium
Common Nametwisted stalk
Place CollectedNorth America: Canada, Alberta, Fairfax Lake
Date Collected1968-06-14