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| Cyperus strigosus L. | Species Image Gallery (opens in a new window) |
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| TAXONOMY | |||||||||||||||||||||
| Family: | Cyperaceae | ||||||||||||||||||||
| Genus: | Cyperus | ||||||||||||||||||||
| Species Synonyms: | Cyperus stenolepis Torr. Cyperus strigosus var. captilus Boeckl. Cyperus strigosus var. multiflorus Geise Cyperus strigosus var. robustior Britt. Cyperus strigosus var. stenolepis (Torr.) Kükenth. Cyperus hansenii Britt |
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| Common Names: | straw-coloured flatsedge strawcoloured nutgrass straw-coloured umbrella-sedge flatsedge nutgrass false nutsedge |
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| DISTRIBUTION | |||||||||||||||||||||
| Canada: | south-central Saskatchewan – southwestern Quebec | ||||||||||||||||||||
| Saskatchewan: | south-central Saskatchewan; Watrous | ||||||||||||||||||||
| Ecoregion: | Moist Mixed Grassland | ||||||||||||||||||||
| HABITAT | |||||||||||||||||||||
| Saskatchewan: | wet shores, damp forest, moist meadows, and swamps | ||||||||||||||||||||
| RARITY STATUS | |||||||||||||||||||||
| Provincial
Status According to Harms (2003): |
Endangered/Extirpated? |
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| Nature Conservancy Status: | G5 SH |
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| Saskatchewan
Species at Risk Status: |
None |
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| COSEWIC Status: | None |
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| Straw-coloured flatsedge is endangered because it is extremely rare and may have been extirpated from Saskatchewan. This species is highly regionally restricted in the province. Immediate threats to this species have been identified. | |||||||||||||||||||||
| SPECIES DESCRIPTION | |||||||||||||||||||||
| Height: | 20 – 50 cm | ||||||||||||||||||||
| Roots: | rhizome hard, short, swollen, with papery leaves | ||||||||||||||||||||
| Stems:: | tufted, stout, solid, three-sided, hairless or with a few prickles | ||||||||||||||||||||
| Leaves: | 20 – 40 cm long, 1 – 10 mm wide, flat, margin and midrib hairless and rough to the touch | ||||||||||||||||||||
| Inflorescence: | head compound, condensed to open, terminal, ovoid
to cylindrical, spikes 1 – 4; spike stalks 3 – 6 cm long or absent; spike axis jointed at base, secondary spike axes occasionally present; bracts 2 – 6, ascending at 30° – 45°, exceeding inflorescence |
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| Spikelets: | 12 – 50 per spike, 5 – 10 mm long, linear to lance-shaped, compressed; floral scales 3 – 11, 3 – 4.5 mm long, may be deciduous, straw-coloured to pale brown, midrib green, 3 – 4 ribbed laterally, 3-ribbed medially, overlapping | ||||||||||||||||||||
| Flowers: | perfect, perianth bristles absent, style 3-cleft | ||||||||||||||||||||
| Achenes: | achene 1.5 – 2 mm long, three-sided, narrowly oblong, glandular dotted, purplish-brown | ||||||||||||||||||||
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