The genus Cyperus of Renfrew County:
A comparative study

By Grant A. Bickel, 2020

Cyperus houghtonii Torrey, Houghton's flatsedge

Cyperus houghtonii is isolated to the dry beaches and sand plains in the upper Ottawa Valley.

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Spikelets, achenes and scales of Cyperus houghtonii

Figure 1. Spikelets, achenes and scales.
Inflorescence of Cyperus houghtonii

Figure 2. Inflorescence.
Spikelets, achenes and scales of Cyperus houghtonii

Figure 3. Habit on beach.
Inflorescence of Cyperus houghtonii

Figure 4. Inflorescence.
Cyperus houghtonii habit

Figure 5. Habit on beach with Hudsonia tomentosa (Beach-heath).
An occurrence map of Cyperus houghtonii in Renfrew County

Figure 6. Occurence map for Renfrew County and surrounding area.
Accession records for specimens from Renfrew County
Accession # Collector Date
DAO 725388 P.M. Catling 1999-July-14
CAN 585367 D.F. Brunton 1998-October-05
CAN 585346 D.F. Brunton 1998-September-29
DAO 669081 P.M. Catling & S.E. Carbyn 1993-September-22
DAO 669102 P.M. Catling & S.E. Carbyn 1993-September-22
DAO 668425 S.E. Carbyn 1993-July-07
DAO 668471, DAO 668472 S.E. Carbyn 1993-June-06
DAO 801565 G. Vogg 1989-July-16
CAN 521834 S.J. Darbyshire & S. Aiken 1986-July-01
CAN 498251 A. Vogg 1984-September-22
DAO 605335 M.I. Moore 1970-August-31
CAN 570128 M.I. Moore 1970-August-26
DAO 246141 W.G. Dore & T.C. Brayshaw 1965-July-22
CAN 570130 T.C. Brayshaw 1961-September-15
CAN 570133 M.I. Moore 1961-August-31
DAO 172343 M.I. Moore 1961-August-31
CAN 570131 A.W.H. Damman 1954-September-08
CAN 493578 M.D. Kirk 1952-July-15
DAO 13764 A.J. Breitung 1948-July-25
DAO 13766 A.J. Breitung 1948-July-20