Chamaesyce serpens (Kunth) Small
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TAXONOMY
 
Family: Euphorbiaceae
Genus: Chamaesyce
 
Species Synonyms: Euphorbia serpens Kunth
Common Names: round-leaved spurge
serpent spurge
matted sandmat
 
DISTRIBUTION
 
Canada: southwestern Saskatchewan, southern Manitoba – southern Ontario
Saskatchewan: southwestern Saskatchewan
Ecoregion: Mixed Grassland
 
HABITAT
 
Saskatchewan: dry, barren hilltops
Associated Species: broom snakeweed, desert wirelettuce, Nuttall’s saltbush, povertyweed, prairie sunflower, western wheatgrass
 
RARITY STATUS
 
Provincial Status According
to Harms (2003):
Endangered
Nature Conservancy Status:
G5 S1
Saskatchewan Species at
Risk Status:
None
COSEWIC Status:
None
 
Round-leaved spurge is endangered in Saskatchewan because it is extremely rare and highly regionally restricted in the province. This species is usually locally numerous within localized areas. Possible threats have been identified for this species.
 
SPECIES DESCRIPTION
 
Roots: fibrous
Stem: annual, lying flat on the ground, 5 – 40 cm long, branched, rooting at nodes, hairless
Leaves: opposite, leaf stalks to 1 mm long, blades 2 – 8 mm long, ovate to round, tip rounded, base unequal and rounded, margins entire; stipules on both sides of stem united to form whitish to pinkish membranous, entire to irregular scale
Inflorescence: solitary at nodes and in forks; involucre 0.7 mm long; glands 4, 1 mm long; appendages white to pink
Flowers: male flowers 3 – 8 per inflorescence; female flowers 1 per inflorescence
Fruits: capsule 1 – 1.5 mm long; seeds 3, brownish with white seed coat, smooth
 
CHAMAESYCE KEY FOR GENERA FOUND IN SASKATCHEWAN
 
1 Stipules on each side of stem united to form whitish or pinkish membranous scale
C. serpens
1 Stipules otherwise
2
   
2 Leaves entire
C. geyeri
2 Leaves saw-toothed at least at the tip
3
   
3 Stems winged towards tip; leaves oblong to oval; seeds faintly wrinkled if at all
C. serpyllifolia
3 Stems not winged near tip; leaves narrowly oblong; seeds strongly wrinkled
C. glyptosperma