Section RACEMOSAE
Only one species from Section RACEMOSAE is found in Renfrew County.
Carex buxbaumii Wahl., Buxbaum’s Sedge
Carex buxbaumii is found in calcareous wetlands and is rare in Renfrew County. Carex buxbaumii is very distinctive with its dark brown scales contrasting with the light green perigynia. At one site in southern Renfrew County, all plants sampled showed about two thirds of the Carex buxbaumii achenes were being eaten by a tiny orange larvae (gall midge of the family Cecidomyiidae). The same larvae were also infesting the neighboring Carex lasiocarpa achenes and very similar larvae have been found at other Renfrew County locations in the achenes of Dulichium arundinaceum.
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Figure 1. Achenes, perigynia and scales.
Figure 2. Inflorescence.
Figure 3. Inflorescence.
Figure 4. Inflorescences.
Figure 5. Inflorescence.
Figure 6. Gall midge larvae infesting the achenes (normal achene on left, consumed achene on right).
Figure 7. Occurence map for Renfrew County and surrounding area.
| Accession # | Collector | Date |
|---|---|---|
| DAO 888087 | S.R. Brinker & M.J. Oldham | 2010-June-22 |
| DAO 573854 | K.W. Spicer | 1988-June-15 |
| DAO 352332 | M.I. Moore | 1962-August-12 |
References
These larvae were identified as members of the Cecidomyiidae family by Jeff Skevington, Canadian National Collection of Insects, Arachnids and Nematodes, Agriculture and Agri-Food Canada.