The genus Carex of Renfrew County:
A comparative study

By Grant A. Bickel, 2020

Carex umbellata Schkuhr ex Willd., Umbellate Sedge (Section ACROCYSTIS)

Carex umbellata is rare in Renfrew County and isolated to alvars and calcareous rocky slopes. It can be easily separated from the similar looking Carex tonsa var rugosperma by the length of the perigynium beak.

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Achenes, perigynia and scales of Carex umbellata

Figure 1. Achenes, perigynia and scales.
Inflorescence of Carex umbellata

Figure 2. Terminal and basal inflorescences.
An occurrence map of Carex umbellata in Renfrew County

Figure 3. Occurence map for Renfrew County and surrounding area.
Accession records for specimens from Renfrew County
Accession # Collector Date
DAO 859635 A. Ward, S. Kyte, G. Gregorich, P.M. Catling & G. Mitrow 2011-June-02
DAO 859645 A. Ward, S. Kyte, G. Gregorich, P.M. Catling & G. Mitrow 2011-June-02
CAN 487114 S.J. Darbyshire & W.J. Crins 1983-June-05