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Species Details
Arabis divaricarpa A. Nels.
University of Alberta Vascular Plant Herbarium Read more about this collection »
LeavesBasal leaves lance-shaped; slightly toothed margin; 1-6 cm long; hairy; 3-rayed trichomes; stem leaves egg to lance-shaped; toothed margin shaped like an arrowhead; smooth (Moss, 1983). Rosette at stem base; 3-8 mm wide; pointed tip; stem leaves smaller; stalkless; clasp stem (Johnson et al., 1995).
FlowersPink to purple petals; 6-10 mm long (Moss, 1983). Cluster at stem tip; 4 petals (Johnson et al., 1995).
Fruits and SeedsDehiscent pod (silique); ascending at 45 degrees or spreading; 2-8 cm long; seeds egg-shaped; narrowly winged (Moss, 1983).
Scientific Name
Arabis divaricarpa A. Nels.
Common Name
purple rock cress
General Description
A biennial or perennial plant that has simple or branching, hairless to sparsely hairy stems 40-80 cm tall; bears pink to purple flowers (Moss, 1983).
Leaves
Basal leaves lance-shaped; slightly toothed margin; 1-6 cm long; hairy; 3-rayed trichomes; stem leaves egg to lance-shaped; toothed margin shaped like an arrowhead; smooth (Moss, 1983). Rosette at stem base; 3-8 mm wide;…
Basal leaves lance-shaped; slightly toothed margin; 1-6 cm long; hairy; 3-rayed trichomes; stem leaves egg to lance-shaped; toothed margin shaped like an arrowhead; smooth (Moss, 1983). Rosette at stem base; 3-8 mm wide; pointed tip; stem leaves smaller; stalkless; clasp stem (Johnson et al., 1995).
Flowers
Pink to purple petals; 6-10 mm long (Moss, 1983). Cluster at stem tip; 4 petals (Johnson et al., 1995).
Fruits and Seeds
Dehiscent pod (silique); ascending at 45 degrees or spreading; 2-8 cm long; seeds egg-shaped; narrowly winged (Moss, 1983).
Phenology
May to July (JSTOR).
Notes
2n=14, 21, 28 (Moss, 1983). Rock cresses have been eaten in salads or sandwiches; they have been cooked as a potherb; they have been combined with eggs, cheese or in potato soup (Johnson et al., 1995).
Similar…
2n=14, 21, 28 (Moss, 1983). Rock cresses have been eaten in salads or sandwiches; they have been cooked as a potherb; they have been combined with eggs, cheese or in potato soup (Johnson et al., 1995).
Similar species:
Arabis drummondii: Drummond's rock cress; has wider pods and seeds in 2 rows (Johnson et al., 1995).
Range/Distribution
Alberta: SW along mountain range and in central-southern half of province (Canadensys). CAN (BC, SK, MB, ON, QC, NL, NS, YT, NT); USA (AK, WA, OR, CA, MT, ID, NV, UT, WY, CO, NM, ND, SD, NE, MN, WI, IA, MI, OH, NY,…
Alberta: SW along mountain range and in central-southern half of province (Canadensys). CAN (BC, SK, MB, ON, QC, NL, NS, YT, NT); USA (AK, WA, OR, CA, MT, ID, NV, UT, WY, CO, NM, ND, SD, NE, MN, WI, IA, MI, OH, NY, VT, ME, NH) (USDA).
Citation
Page Citation for Arabis divaricarpa A. Nels.
Page Citation
"Species Details - Arabis divaricarpa A. Nels., University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/g/1-5054/12-117080. Accessed 21 Jan. 2025.
Specimen Information
There are 72 specimens of this Species.
112772 - Arabis divaricarpa A. Nels.
University of Alberta Vascular Plant Herbarium
Common Namepurple rock cress
Place CollectedNorth America: Canada, Alberta, Kananaskis Country, Peter Lougheed Provincial Park, Storm Creek
Date Collected1973-07-15
121947 - Arabis divaricarpa A. Nels.
University of Alberta Vascular Plant Herbarium
Common Namepurple rock cress
Place CollectedNorth America: Canada, Alberta, Crescent Falls Provincial Recreation Area
Date Collected2009-06-18
121948 - Arabis divaricarpa A. Nels.
University of Alberta Vascular Plant Herbarium
Common Namepurple rock cress
Place CollectedNorth America: Canada, Alberta, Mount Stelfox
Date Collected2009-07-21
58168 - Arabis divaricarpa A. Nels.
University of Alberta Vascular Plant Herbarium
Common Namepurple rock cress
Place CollectedNorth America: Canada, Northwest Territories, Yellowknife Bay
Date Collected1940-06-14
94006 - Arabis divaricarpa A. Nels.
University of Alberta Vascular Plant Herbarium
Common Namepurple rock cress
Place CollectedNorth America: Canada, Northwest Territories, Mackenzie Bison Sanctuary
Date Collected1987-07-01
86526 - Arabis divaricarpa A. Nels.
University of Alberta Vascular Plant Herbarium
Common Namepurple rock cress
Place CollectedNorth America: Canada, Northwest Territories, Fort Providence
Date Collected1973-06-05
85335 - Arabis divaricarpa A. Nels.
University of Alberta Vascular Plant Herbarium
Common Namepurple rock cress
Place CollectedNorth America: Canada, Northwest Territories, Hornby Bay
Date Collected1980-08-14
30202 - Arabis divaricarpa A. Nels.
University of Alberta Vascular Plant Herbarium
Common Namepurple rock cress
Place CollectedNorth America: Canada, Northwest Territories, Great Bear Lake, Hunter Bay
Date Collected1928-08-09/1928-08-10
9382 - Arabis divaricarpa A. Nels.
University of Alberta Vascular Plant Herbarium
Common Namepurple rock cress
Place CollectedNorth America: Canada, Northwest Territories, Reliance
Date Collected1949-07
23059 - Arabis divaricarpa A. Nels.
University of Alberta Vascular Plant Herbarium
Common Namepurple rock cress
Place CollectedNorth America: Canada, Northwest Territories, Fort Simpson
Date Collected1955-07-28
125248 - Arabis divaricarpa A. Nels.
University of Alberta Vascular Plant Herbarium
Common Namepurple rock cress
Place CollectedNorth America: Canada, Alberta, Kootenay Plains
Date Collected1981-07-28
125249 - Arabis divaricarpa A. Nels.
University of Alberta Vascular Plant Herbarium
Common Namepurple rock cress
Place CollectedNorth America: Canada, Alberta, Little Fish Lake
Date Collected1982-06-23
125250 - Arabis divaricarpa A. Nels.
University of Alberta Vascular Plant Herbarium
Common Namepurple rock cress
Place CollectedNorth America: Canada, Alberta, Battle River (undet.)
Date Collected1982-07-21
125251 - Arabis divaricarpa A. Nels.
University of Alberta Vascular Plant Herbarium
Common Namepurple rock cress
Place CollectedNorth America: Canada, Alberta, Paintearth
Date Collected1983-06-08
125255 - Arabis divaricarpa A. Nels.
University of Alberta Vascular Plant Herbarium
Common Namepurple rock cress
Place CollectedNorth America: Canada, Alberta, La Butte Creek Wildland Park
Date Collected2001-07-06
125256 - Arabis divaricarpa A. Nels.
University of Alberta Vascular Plant Herbarium
Common Namepurple rock cress
Place CollectedNorth America: Canada, Alberta, Fort Chipewyan
Date Collected2001-07-16
82443 - Arabis divaricarpa A. Nels.
University of Alberta Vascular Plant Herbarium
Common Namepurple rock cress
Place CollectedNorth America: Canada, Alberta, Waterton Lakes National Park, Blakiston Creek
Date Collected1970-06-04
82444 - Arabis divaricarpa A. Nels.
University of Alberta Vascular Plant Herbarium
Common Namepurple rock cress
Place CollectedNorth America: Canada, Alberta, Waterton Lakes National Park, Lost Lake
Date Collected1970-07-11
82458 - Arabis divaricarpa A. Nels.
University of Alberta Vascular Plant Herbarium
Common Namepurple rock cress
Place CollectedNorth America: Canada, Alberta, Waterton Lakes National Park
Date Collected1970-06-08
79619 - Arabis divaricarpa A. Nels.
University of Alberta Vascular Plant Herbarium
Common Namepurple rock cress
Place CollectedNorth America: Canada, Alberta, Kananaskis Country, Mount Wintour
Date Collected1977-05-26
25389 - Arabis divaricarpa A. Nels.
University of Alberta Vascular Plant Herbarium
Common Namepurple rock cress
Place CollectedNorth America: Canada, Alberta, Wapiabi Creek
Date Collected1968-06-13