Rock Garden Plants
Delphinium bicolor Nutt.  
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FamilyRANUNCULACEAE
Genus speciesDelphinium bicolor Nutt. 
SynonymsDelphinium helleri Rydb.
Habitatgrassland
Altitude600-3100m
Descriptionleaves few, usually basal, 3-6cm wide, palmatipinnate, segments incised, ultimate lobes narrowly oblong, flowers 2-15, 15-20cm long, in lax raceme, calyx dark purple-blue
Size10-30cm
Colordark blue
Bloomlate spring, summer
Ca-
Typetuft
Cultivationmesic, slightly humous, sunny site
alpine house, moist, rich, drained soil, sun
Propagationseed in winter, barely covered, germ. 1-3 months, 10-13°C
division in spring just as young growth commences
Territory Northern America
     Western Canada (Alberta , British Columbia , Saskatchewan )
     Northwestern U.S.A. (Idaho , Montana , Wyoming )
     North-Central U.S.A. (North Dakota , Nebraska , South Dakota)
BibliographyPlants of the World online powo.science.kew.org
International Plant Names Index www.ipni.org
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Comments

RANUNCULACEAE

Delphinium bicolor Nutt., J. Acad. Nat. Sci. Philadelphia 7: 10 (1834)

Synonyms:
Plectrornis bicolor (Nutt.) Lunell
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bicolor typicum Huth, Helios 10: 32 (1892)

Synonyms:
Delphinium bicolor de-vriesii B.Boivin
Delphinium bicolor helleri (Rydb.) Ewan
Delphinium bicolor mccallae Ewan
Delphinium bicolor montanense Rydb.
Delphinium helleri Rydb.
Plectornis bicolor montanensis (Rydb.) Lunell

w. Canada, nw. & nc. USA
71 ABT BRC SAS 73 IDA MNT WYO 74 NDA NEB SDA

600-3100m

bicolor calcicola M.J.Warnock & Vanderhorst, Phytologia 78(2): 90 (1995)

Montana
73 MNT

1300-2100m

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