Carex albolutescens — green-white sedge
![Perigynia: Carex albolutescens. ~ By Elizabeth Farnsworth. ~ Copyright © 2024 New England Wild Flower Society. ~ Image Request, images[at]newenglandwild.org](https://newfs.s3.amazonaws.com/taxon-images-1000s1000/Cyperaceae/carex-albolutescens-pe-efarnsworth.jpg)
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Facts
Green-white sedge is absent from northern New England. It is easy to confuse with fescue sedge (Carex festucacea), but differs in having narrower achenes, 0.75 to 1mm wide, while fescue sedge has achenes of 1 to 1.3mm width. Also, the styles of green-white sedge are bent near the base, toward the margin of the achene, while those of fescue sedge are bent towards the broad surface of the achene. The sedges from this group are notoriously difficult to separate.
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
- Rhode Island
- Vermont
- Leaf blade width
- 2–3.5 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 is not borne on 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
- 2.6–4.5 mm
- Leaf sheath color
- the leaf sheath has no pink, red or purple tinting
- 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
- Inflorescence length
- 15–40 mm
- Length of scale
- the scale is nearly as long as, or longer than, the perigynium
- Lowest spike length
- 5–13 mm
- Lowest spike stalk length
- 0 mm
- Lowest spike width
- 4–6.5 mm
- Perigynium beak
- the perigynium has a beak
- Perigynium beak orientation
- the beak of the perigynium is curved, or angled out from the perigynium
- Perigynium beak serrations
- the perigynium beak has tiny serrations along the edges
- Perigynium beak teeth
- the perigynium beak is divided at the top into two teeth
- Perigynium color
-
- green
- tan
- Perigynium cross-section
-
- the perigynium is planoconvex (flat on one surface and rounded on the other) in cross-section
- the perigynium is relatively flat in cross-section
- Perigynium hairs
- the perigynium has no hairs
- Perigynium length
- 2.6–4.5 mm
- Perigynium nerve number
- At least 8
- Perigynium nerve texture
- the nerves on the perigynium are raised, even after drying the perigynium
- Perigynium nerves lower side
- At least 4
- Perigynium nerves upper side
- At least 4
- Perigynium orientation
- the perigynia are angled outwards
- Perigynium puffy
- the achene is tightly enclosed by the perigynium
- Perigynium shape
- the perigynium body is obovate (egg-shaped, but with the widest point above the middle of the leaf blade)
- Perigynium width
- 1.5–2.7 mm
- Perigynium winged
- the perigynium has wings on it
- 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)
- Scale awn texture
- NA
- Scale color
-
- brown
- white or translucent
- Scale length
- 2.5–3.4 mm
- Scale tip
- the carpellate scale tip is acute (has a sharp point)
- Spike on stalk
- the lowest spike on the plant is not borne on a peduncle
- Spike orientation
- the spikes are oriented vertically or pressed against the axis
- Spikes per stem
- 2-15
- Stigma branching
- the stigmas have two 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
- 1.3–1.7 mm
- Achene width
- 0.75–1 mm
- Style persistence
- the style falls off 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 length to width ratio
- 45–71
- Leaf blade texture
- the leaf blade is smooth and hairless, or rough and sandpapery
- Leaf blade width
- 2–3.5 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
- 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
- Ligule length
- 1.5–4.5 mm
- Lowest bract sheath
- the lowest bract has no sheath (or a very short sheath up to four millimeters in length)
- Lowest leaf blade width
- 2–3.5 mm
- Lowest leaf sheath texture
- the leaf sheath feels smooth (it may have soft hairs)
-
Place
- Habitat
- wetlands
- New England state
-
- Connecticut
- Massachusetts
- Rhode Island
- Vermont
- Specific habitat
-
- edges of wetlands
- swamps
-
Stem, shoot, branch
- Plant height
- 25–120 cm
- Relative stem height
- the main stem is taller than the leaves
- Spike internode length
- 3–12 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
Usually occurs in wetlands, but occasionally in non-wetlands. (Wetland indicator code: FACW)
In New England
Distribution
- Connecticut
- present
- Maine
- absent
- Massachusetts
- present
- New Hampshire
- present
- Rhode Island
- absent
- Vermont
- absent
Conservation status
Exact status definitions can vary from state to state. For details, please check with your state.
- Massachusetts
- unranked (S-rank: SNR)
From Flora Novae Angliae dichotomous key
36. Carex albolutescens Schwein. N
green-white sedge. CT, MA, RI, VT. Acidic swamps and wetland margins. This species is sometimes confused with Carex festucacea. In addition to characters used in the identification key, these species differ in achene width, style shape, and perigynium shape. Carex albolutescens has achenes 0.75–1 mm wide, styles that are laterally bent near the base (i.e., the bend is toward the margins of the achene), and obovate perigynia bodies. Carex festucacea has achenes 1–1.3 mm wide, styles that are straight or adaxially-abaxially bent (i.e., the bend is toward the broad surfaces of the achene), and orbicular to elliptic perigynia bodies.
Native to North America?
Yes