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| Cyperus schweinitzii Torr. | Species Image Gallery (opens in a new window) |
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| TAXONOMY | |||||||||||||||||||||
| Family: | Cyperaceae | ||||||||||||||||||||
| Genus: | Cyperus | ||||||||||||||||||||
| Species Synonyms: | Cyperus X mesochoreus Geise Cyperus schweinitzii var. uberior Kükenth. Mariscus schweinitzii (Torr.) T. Koyama |
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| Common Names: | Schweinitz’s sedge sand flatsedge Schweinitz’s umbrella-sedge |
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| DISTRIBUTION | |||||||||||||||||||||
| Canada: | Alberta – Ontario – southwestern Quebec | ||||||||||||||||||||
| Saskatchewan: | southern to central Saskatchewan; Artland – Dundurn - Roche Percee | ||||||||||||||||||||
| Ecoregion: | Mixed Grassland, Moist Mixed Grassland, Boreal Transition | ||||||||||||||||||||
| HABITAT | |||||||||||||||||||||
| Saskatchewan: | active sand dune blowouts | ||||||||||||||||||||
| Associated Species: | Acer negundo, Asclepias viridiflora, Calamovilfa longifolia, Dalea villosa var. villosa, Elymus lanceolatus ssp. lanceolatus, Opuntia fragilis, Sporobolus cryptandrus | ||||||||||||||||||||
| RARITY STATUS | |||||||||||||||||||||
| Provincial
Status According to Harms (2003): |
Vulnerable |
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| Nature Conservancy Status: | G5 S2 |
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| Saskatchewan
Species at Risk Status: |
None |
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| COSEWIC Status: | None |
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| Cyperus schweinitzii is vulnerable in Saskatchewan because it is rare and limited to sand dune complexes, making it somewhat regionally restricted. The sand dune environment is fragile, which poses a threat to this species. | |||||||||||||||||||||
| SPECIES DESCRIPTION | |||||||||||||||||||||
| Height: | 20 – 50 cm | ||||||||||||||||||||
| Roots: | rhizome, corm-like thickenings present | ||||||||||||||||||||
| Culms: | perennial, 1 – 2 mm wide, trigonous, glabrous or scabrous | ||||||||||||||||||||
| Leaves: | 20 – 35 cm long, 2 – 6 mm wide, flat to V-shaped, margin scabrous; basal sheaths 1 – 3, 1 – 4 cm long, papery, light brown | ||||||||||||||||||||
| Inflorescence: | spikes 10 – 25 mm long, arrangement ovoid to umbellate; rays 3 – 5, 1.5 – 8 cm long; bracts 3 – 7, 8 – 20 cm long, erect | ||||||||||||||||||||
| Spikelets: | 5 – 10 per spike; 7 – 10 mm long, linear; floral scales deciduous, spreading, ovate to oblong, 5 – 6 ribbed, stramineus or dull whitish, may be red-spotted, midrib green | ||||||||||||||||||||
| Flowers: | stamens 1; styles 0.1 – 0.3 mm long, stigma 1.5 – 3 mm long | ||||||||||||||||||||
| Achenes: | broadly ellipsoid, light to dark brown or nearly black, papillose | ||||||||||||||||||||
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