Sagina decumbens ssp. decumbens (Ell.) Torr. & Gray
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TAXONOMY
 
Family: Caryophyllaceae
Genus: Sagina
 
Species Synonyms: Sagina decumbens var. smithii (Gray) S. Wats.
Common Names: trailing pearlwort
 
DISTRIBUTION
 
Canada: southeastern Alberta – southwestern Saskatchewan, Ontario – New Brunswick
Saskatchewan: southwestern Saskatchewan; Cypress Hills
Ecoregion: Cypress Upland
 
HABITAT
 
Saskatchewan: dry hillsides
 
RARITY STATUS
 
Provincial Status According
to Harms (2003):
Endangered/Extirpated?
Nature Conservancy Status:
G5 SH
Saskatchewan Species at
Risk Status:
None
COSEWIC Status:
None
 
Trailing pearlwort is endangered or extirpated from Saskatchewan. It is extremely rare, highly regionally restricted and is almost always locally sparse. This plant has not been reported in Saskatchewan in recent surveys of the Cypress Hills area.
 
SPECIES DESCRIPTION
 
Height: 2 – 10 cm
Roots: fibrous
Stems: tufted, erect to reclining and spreading, branched from base, green or purple-tinged, hairless or occasionally glandular-hairy above
Leaves: basal leaves lacking or falling off; stem leaves opposite, sessile, 4 – 20 mm long, to 1 mm wide, reduced upwards, linear, fused at base, tip abruptly pointed, hairless, margin membranous
Inflorescence: many-flowered, branched, flowers occasionally solitary, terminal and axillary; flower stalks thread-like
Flowers: perfect; sepals 5, 1.4 – 2.2 mm long, obscurely nerved, green with purple tips, margin narrowly membranous; petals 5, small, white; stamens 8 or 10; styles 5
Fruits: capsule many seeded, 5- valved, oval shaped; seeds light tan, minutely bumpy
 
KEY TO SAGINA IN SASKATCHEWAN
 
1 Upper leaves with bulb-like axillary clusters; petals approximately twice as long as sepals; seeds dark brown or blackish
S. nodosa
1 Upper leaves without bulb-like axillary clusters; petals equal to or only slightly longer than sepals; seeds light tan
S. decumbens ssp. decumbens