Carex radiata Schwein. -  Straight-styled Wood Sedge


 

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Carex radiata - (image 1 of 6)

 

Taxonomy

Family: Cyperaceae

 

Section Bracteaosae  

 

Once misapplied to Carex rosea.

Habitat

Moist, mesophytic woods and wet depressions. Tends to occupy wetter areas than does C. rosea.

Associates

 

Distribution

Nova Scotia and southern Quebec west to Manitoba and ND, south to NC, AL, and MO.

Morphology

In solitary tufts; stems erect, slender, to 80 cm; fertile stems 0.8 to 1.5 mm thick at the base. Leaves narrow, to 1.9 mm wide; sheaths tight, only slightly thickened at the summit. Spikes 4-7, androgynous, sessile, less than 1 cm wide; bracts setaceous, the lowest often surpassing the inflorescence; perigynia 2-20, light green, 3-4 mm long, the beak serrulate-margined, reflexed at maturity; scales persistent, light tan with a dark midvein, shorter than the perigynia; stigmas slender, straight to twisted or recurved, red-brown, slightly longer than the beaks. Achene lenticular, ovate to obovate, occupying only the upper half of the basally subtruncate perigynium.

Notes

Flowers April to May

Wetland indicator: Facultative -

Can be distinguished from C. appalachica and C. rosea by the uncoiled stigmas and the achene which only occupies the upper half of the perigynium (the achene occupies more than half of the perigynium in the other two species). Additionally, C. rosea tends to have wider leaves and C. appalachica has perigynia that are ascending to spreading but not reflexed. Often occurs in the same habitats as C. rosea but associated with wetter microsites.

References

Curtis, L. 2006. Woodland Carex of the upper Midwest. Lake Villa, IL.

 

Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Second Ed.
The New York Botanical Garden. Bronx, NY

 

Swink, F. and G. Wilhelm. 1994. Plants of the Chicago Region.
Indiana Academy of Science. The Morton Arboretum. Lisle, Illinois.

 


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Michael Hough 2010