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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: | American water plantain, Engelmann’s spikerush, needle spikerush | ||||||||||||||||||||
| 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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| Tapertip flatsedge 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, tufted, three-angled, edges rounded, straw-coloured, bottom half hairless or rough | ||||||||||||||||||||
| Leaves: | 2 – 6 per stem, basal, 8 – 12 cm long, nearly equalling or slightly longer than stem, 1 – 2 mm wide, V-shaped or flat | ||||||||||||||||||||
| Inflorescence: | heads numerous, 7 – 12 mm diameter, spherical; 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, tip with a sharp point, yellowish-green to light reddish-brown, midrib light brown or greenish, hairless or sparsely rough hairy, gradually falling off | ||||||||||||||||||||
| Flowers: | 10 – 24 per spike, perfect; stamens 1; styles 3-cleft, to 1.1 mm | ||||||||||||||||||||
| Achenes: | stalked, ellipsoid, tapering to slender beak, three-sided, brown | ||||||||||||||||||||
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