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
 
Sagina decumbens ssp. decumbens is endangered or extirpated from Saskatchewan. It is extremely rare, highly regionally restricted and 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 decumbent and spreading, branched from base, green or purple-tinged, glabrous or occasionally glandular-hairy above
Leaves: basal leaves lacking or early deciduous; cauline leaves opposite, sessile, 4 – 20 mm long, to 1 mm wide, reduced upwards, linear, base connate, apex apiculate, glabrous, margin hyaline
Inflorescence: cyme many-flowered, flowers occasionally solitary, terminal and axillary; pedicels filiform
Flowers: perfect; calyx 5, 1.4 – 2.2 mm long, obscurely nerved, green with purple tip, margin narrowly hyaline; corolla 5, small, white; stamens 8 or 10; styles 5
Fruits: capsule many seeded, 5-valved, ovoid; seeds light tan, minutely tuberculate
 
KEY TO SAGINA IN SASKATCHEWAN
 
1 Upper leaves with bulb-like axillary clusters (fascicles); corolla approximately twice as long as calyx; seeds dark brown or blackish
S. nodosa
1 Upper leaves without bulb-like axillary clusters; corolla equal to or only slightly longer than calyx; seeds light tan
S. decumbens ssp. decumbens