The genus Bolboschoenus of Renfrew County:
A comparative study

By Grant A. Bickel, 2020

Genus Bolboschoenus (Ascherson) Palla, Tuberous bulrush

Species in the Bolboschoenus genus are distinguished by their colonial behavior, sending out rhizomes terminated in corms (Figure 4), and sharply trigonous stems that lack a leaf sheath ligule (Figure 5). Bolbos = bulb and schoenus = rush. The Bolboschoenus genus is represented by only one species in Renfrew County.

Bolboschoenus fluviatilis (Torr.) Soják, River bulrush

Bolboschoenus fluviatilis is sparse in Renfrew County and found in shallow water or sandy wet beaches of lakeshores and rivers.

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Achenes and scales of Bolboschoenus fluviatilis

Figure 1. Achenes and scales.
Bolboschoenus fluviatilis in habitat

Figure 2. Inflorescence in habitat.
Bolboschoenus fluviatilis in habitat

Figure 3. Inflorescence in habitat.
Bolboschoenus fluviatilis rhizome and corm

Figure 5. Rhizome and corm with new shoot.
Bolboschoenus fluviatilis stem

Figure 6. Sharply trigonous stem and leaf sheath.
An occurrence map of Bolboschoenus fluviatilis in Renfrew County

Figure 6. Occurence map for Renfrew County and surrounding area.
Verified records for specimens from Renfrew County
Accession # Collector Date
DAO 728822 S.J. Darbyshire & S. Meier 1998-September-20
CAN 468810 S.J. Darbyshire 1981-September-20
CAN 300497 J.H. Soper 1961-July-10
CAN 570246 T.C. Brayshaw 1960-September-10
DAO 250041 J.A. Calder & D.B.O. Savile 1952-August-06