Scirpus atrovirens Willdenow, Dark-green bulrush
Scirpus atrovirens is common in Renfrew County. It appears in a wide variety of wetlands. Previously, Scirpus atrovirens encompassed several species that have since gained acceptance as distinct species. The Scirpus atrovirens accession records from CAN reflect this lumping and have been assessed and updated. I have yet to evaluate those in DAO so they are not mapped as it is expected that many of those records will turn out to be Scirpus hattorianus. The visual characteristics of S. hattorianus and S. atrovirens are indistinct and microscopic views of the scales, perianth bristles and achenes are required to reliably separate these two species (Figure 3). See Scirpus hattorianus for more discussion on discriminating these two species.
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Figure 1. Spikelets, achenes and scales.
Figure 2. Inflorescences.
Figure 3. Comparison of achenes and scales.
Figure 4. Occurence map for Renfrew County and surrounding area.
| Accession # | Collector | Date |
|---|---|---|
| CAN 551698 | A. Vogg | 1988-August-07 |
| CAN 551553 | A. Vogg | 1988-July-16 |
| CAN 496839 | A. Vogg | 1982-July-23 |
| CAN 468033 | S.J. Darbyshire | 1981-August-02 |
| CAN 362583 | M.J. Shchepanek | 1972-August-31 |
| CAN 570231(1) | M.I. Moore & J. MacLean | 1969-October-01 |
| CAN 570231(2) | T.C. Brayshaw | 1960-October-16 |