Carex squarrosa — squarrose sedge
![Inflorescence: Carex squarrosa. ~ By Arthur Haines. ~ Copyright © 2024 Arthur Haines. ~ arthur.d.haines[at]gmail.com](https://newfs.s3.amazonaws.com/taxon-images-1000s1000/Cyperaceae/carex-squarrosa-in-ahaines.jpg)
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Facts
Within New England, squarrose sedge occurs only in Connecticut, where it is protected, and Massachusetts, where the single population is considered to have been introduced.
Habitat
Swamps, wetland margins (edges of wetlands)
New England distribution
Adapted from BONAP data
Native: indigenous.
Non-native: introduced (intentionally or unintentionally); has become naturalized.
County documented: documented to exist in the county by evidence (herbarium specimen, photograph). Also covers those considered historical (not seen in 20 years).
State documented: documented to exist in the state, but not documented to a county within the state. Also covers those considered historical (not seen in 20 years).
Note: when native and non-native populations both exist in a county, only native status is shown on the map.
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enlargeCharacteristics
- Habitat
- wetlands
- New England state
-
- Connecticut
- Massachusetts
- Leaf blade width
- 3–5.7 mm
- Lowest bract sheath
- the lowest bract has no sheath (or a very short sheath up to four millimeters in length)
- Spike on stalk
- the lowest spike on the plant has a peduncle
- Top spike
- the uppermost spike contains both staminate and carpellate flowers, with the staminate flowers located below the carpellate flowers
- Perigynium hairs
- the perigynium has no hairs
- Perigynium length
- 5.8–9.7 mm
- Leaf sheath color
-
- the leaf sheath has no pink, red or purple tinting
- the leaf sheath is tinted pink, red or purple
- Leaf blade texture
- the leaf blade is smooth and hairless, or rough and sandpapery
- Perigynium beak teeth
- the perigynium beak is divided at the top into two teeth
-
Flowers
- Bumps on fruit
- there are no papillae on the perigynium surface
- Length of scale
- the scale is shorter than the perigynium
- Perigynium beak
- the perigynium has a beak
- Perigynium beak length
- 2.1–3.8 mm
- Perigynium beak orientation
- the beak of the perigynium is straight, and in line with the perigynium
- Perigynium beak serrations
- the perigynium beak has no serrations
- Perigynium beak teeth
- the perigynium beak is divided at the top into two teeth
- Perigynium beak teeth length
- At least 0.3 mm
- Perigynium color
-
- green
- yellow
- Perigynium cross-section
- the perigynium is relatively round in cross-section
- Perigynium hairs
- the perigynium has no hairs
- Perigynium length
- 5.8–9.7 mm
- Perigynium nerve texture
- the nerves on the perigynium are raised, even after drying the perigynium
- Perigynium orientation
-
- the perigynia are angled outwards
- the perigynia are curved or bent downwards or backwards along the axis
- Perigynium puffy
- the perigynium is inflated (there is space between the perigynium and the achene)
- Perigynium shape
- the perigynium body is obovate (egg-shaped, but with the widest point above the middle of the leaf blade)
- Perigynium width
- 1.9–3.3 mm
- Perigynium winged
- the perigynium has no wings
- Pollen- and seed-producing spikes
- some of the spikes produce perigynia
- Pollen-producing spike length
- 0 mm
- Pollen-producing spike number
- 0
- Pollen-producing spike peduncle length
- 0 mm
- Pollen-producing spike width
- 0 mm
- Scale awn
-
- The carpellate scale does not have an awn (it may have a short point)
- the carpellate scale has an awn on it
- Scale awn texture
-
- NA
- the carpellate scale awn does not have teeth (it may or may not have hairs)
- Scale length
- 3–4.5 mm
- Scale tip
- the carpellate scale tip is acute (has a sharp point)
- Spike on stalk
- the lowest spike on the plant has a peduncle
- Spike orientation
- the spikes are oriented vertically or pressed against the axis
- Spikes per stem
-
- 1
- 2-15
- Staminate scale tip
- the staminate scale tip is acute (has a sharp point)
- Stigma branching
- the stigmas have three branches
- Top spike
- the uppermost spike contains both staminate and carpellate flowers, with the staminate flowers located below the carpellate flowers
-
Fruits or seeds
- Achene dimples
- the achene has no folds or dimples
- Achene length
- 2.3–3 mm
- Achene width
- 1.1–1.4 mm
- Style persistence
- the style stays on the mature achenes
-
Growth form
- Rhizomes
- there are no rhizomes, or the rhizomes are very short
-
Leaves
- Leaf arrangement
- the leaves are mostly produced higher up on the plant
- Leaf blade cross-section
- The leaf blade is folded lengthwise, with one prominent midvien
- Leaf blade texture
- the leaf blade is smooth and hairless, or rough and sandpapery
- Leaf blade width
- 3–5.7 mm
- Leaf bumps
- the upper surface of the leaf blade does not have papillae
- Leaf sheath bumps
- there are no papillae at the top edge of the leaf sheath
- Leaf sheath color
-
- the leaf sheath has no pink, red or purple tinting
- the leaf sheath is tinted pink, red or purple
- Leaf sheath dots
- there are no dots on the leaf sheathes
- Leaf sheath folds
- there are no corrugations on the leaf sheath
- Leaf sheath texture
- the leaf sheath feels smooth, and has no hairs
- Lowest bract sheath
- the lowest bract has no sheath (or a very short sheath up to four millimeters in length)
- Lowest leaf blade width
- 3–5.7 mm
- Lowest leaf sheath texture
- the leaf sheath feels smooth (it may have soft hairs)
-
Place
- Habitat
- wetlands
- New England state
-
- Connecticut
- Massachusetts
- Specific habitat
-
- edges of wetlands
- swamps
-
Stem, shoot, branch
- Plant height
- 30–80 cm
- Relative stem height
- the main stem is equal to or shorter than the leaves
- Spike internode length
- At least 0 mm
- Stem cross-section
- the main stem is roughly triangular in cross-section
- Stem spacing
- the stems grow close together in compact clusters or tufts
Wetland status
Occurs only in wetlands. (Wetland indicator code: OBL)
In New England
Distribution
- Connecticut
- present
- Maine
- absent
- Massachusetts
- present
- New Hampshire
- absent
- Rhode Island
- absent
- Vermont
- absent
Conservation status
Exact status definitions can vary from state to state. For details, please check with your state.
- Connecticut
- uncommon (S-rank: S3), special concern (code: SC)
From Flora Novae Angliae dichotomous key
168. Carex squarrosa L. N
squarrose sedge. CT, MA. Swamps, wetland margins. Though one of the MA population of Carex squarrosa is considered to be introduced through intentional planting (Sorrie and Somers 1999), there are native occurrences from Berkshire and Hampshire Counties.