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| Cyperus acuminatus Torr. & Hook. ex Torr. | Species Image Gallery (opens in a new window) |
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| TAXONOMY | |||||||||||||||||||||
| Family: | Cyperaceae | ||||||||||||||||||||
| Genus: | Cyperus | ||||||||||||||||||||
| Species Synonyms: | none | ||||||||||||||||||||
| Common Names: | tapertip flatsedge | ||||||||||||||||||||
| DISTRIBUTION | |||||||||||||||||||||
| Canada: | southern Saskatchewan | ||||||||||||||||||||
| Saskatchewan: | southern Saskatchewan; near Lang | ||||||||||||||||||||
| Ecoregion: | Moist Mixed Grassland | ||||||||||||||||||||
| HABITAT | |||||||||||||||||||||
| Saskatchewan: | shores, wet low areas, and damp disturbed soils | ||||||||||||||||||||
| Associated Species: | Alisma plantago-aquatica, Eleocharis acicularis, Eleocharis engelmanii | ||||||||||||||||||||
| RARITY STATUS | |||||||||||||||||||||
| Provincial
Status According to Harms (2003): |
Endangered |
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| Nature Conservancy Status: | G5 |
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| Saskatchewan
Species at Risk Status: |
None |
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| COSEWIC Status: | None |
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| Cyperus acuminatus is endangered in Saskatchewan because it is extremely rare and is found in only one location. This species has not been reported anywhere else in Canada and the Saskatchewan population probably represents a northern range extension. | |||||||||||||||||||||
| SPECIES DESCRIPTION | |||||||||||||||||||||
| Height: | 20 – 30 cm | ||||||||||||||||||||
| Roots: | fibrous | ||||||||||||||||||||
| Culms: | annual, caespitose, trigonous, edges rounded, stramineus, bottom half glabrous or scabrous | ||||||||||||||||||||
| Leaves: | 2 – 6 per culm, basal, 8 – 12 cm long, nearly equalling or slightly longer than culm, 1 – 2 mm wide, V-shaped or flat | ||||||||||||||||||||
| Inflorescence: | heads numerous, 7 – 12 mm diameter, globose; rays 1 – 3, 0.5 – 2 cm long; bracts 3 – 6, longest erect to ascending, 3 – 12 cm long, longer than inflorescence, flat to V-shaped | ||||||||||||||||||||
| Spikelets: | 25 – 50 per head, 4 – 7 mm long, ovoid, compressed; floral scales outwardly curved at tip, strongly 3-nerved, apex mucronate, yellowish-green to light reddish-brown, midrib light brown or greenish, glabrous or sparsely scabrous, gradually deciduous | ||||||||||||||||||||
| Flowers: | 10 – 24 per spikelet, perfect; stamens 1; styles 3-cleft, to 1.1 mm | ||||||||||||||||||||
| Achenes: | stipitate, ellipsoid, tapering to slender beak, trigonous, brown | ||||||||||||||||||||
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