Cuscuta corylii Engelm.
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TAXONOMY
 
Family: Cuscutaceae
Genus: Cuscuta
 
Species Synonyms: none
Common Names: hazel dodder
 
DISTRIBUTION
 
Canada: southwestern Saskatchewan
Saskatchewan: southwestern Saskatchewan; Mortlach area
Ecoregion: Mixed Grassland
 
HABITAT
 
Saskatchewan: parasitic on a variety of hosts, including Turtle Mountain goldenrod and wild licorice
 
RARITY STATUS
 
Provincial Status According
to Harms (2003):
Vulnerable
Nature Conservancy Status:
G5 N1 S1
Saskatchewan Species at
Risk Status:
None
COSEWIC Status:
None
 
Hazel dodder is vulnerable because of extreme rarity and limitation to one region of the province. The Saskatchewan population is isolated from other populations of the same species.
 
SPECIES DESCRIPTION
 
Roots: plants do not root in soil; suckers attach stem to other plants
Stems: parasitic annual, twining, 0.4 – 0.6 mm diameter, yellow-orange
Leaves: absent
Inflorescence: small, branched, terminal flowers maturing first; flowers stalked
Flowers: 2.5 – 3 mm long; sepals mostly 4, distinct, acute, surrounded by scale-like bracts; petals mostly 4, slenderly bell-shaped, petal tube to 2 mm long; scales in throat 2-cleft, very small; stamens equal to petal lobes; ovary thickened towards the top, stigma head-like
Fruits: capsule spherical, becoming depressed spherical, capped by withered petals; seeds usually 4, 1.5 mm, globular, covered in bran-like scales
 
CUSCUTA SPECIES IN SASKATCHEWAN
 
1 Flowers mostly 4-parted
C. corylii
1 Flowers mostly 5-parted
2
   
2 Petal lobes inflexed at tip; capsule depressed-spherical
C. pentagona var. pentagona
2 Petals lobed erect or spreading; capsule spherical-ovoid
3
   
3 Petal lobes erect; withered petals capping mostly tip of capsule, but also base at times; seeds 2 – 3 mm
C. megalocarpa
3 Petal lobes spreading; withered petals capping base of capsule; seeds 1 – 1.5 mm
C. gronovii var. gronovii