CAREX

Carex abscondita Mackenzie - . 2n = ?

Rich, moist, deciduous or deciduous-evergreen woods.

CAREX ACUTIFORMIS Ehrhart - . 2n = 78.

Open swamps and wet thickets, borders of saline marshes, boggy meadows, lake shores. From Europe.

Carex adusta Boott - . 2n = 78.

Dry, open, sandy woods and clearings, in acid soil.

Carex aestivalis M. A. Curtis ex A. Gray - Summer Sedge. 2n = 56.

Wooded or rocky slopes.

Carex aggregata Mackenzie - . 2n = ?

Meadows, thickets, rich woods, usually on calcareous soil.  [C. sparganioides Muhlenberg ex Willdenow var. aggregata (Mackenzie) Gleason]

Carex alata Torrey - . 2n = 74.

Marshes, low woods, peaty shores, wet thickets.

Carex albicans Willdenow ex Sprengel var. albicans - . 2n = 36.

Dry, usually acidic woods and clearings.  [C. artitecta Mackenzie; C. artitecta Mackenzie var. subtilirostris F. J. Hermann; C. nigromarginata Schweinitz var. muhlenbergii (A. Gray) Gleason]

Carex albicans Willdenow ex Sprengel var. emmonsii (Dewey ex Torrey) Rettig - . 2n = 36.

Woods, usually deciduous, clearings.  [C. emmonsii Dewey ex Torrey]

Carex albolutescens Schweinitz - . 2n = 66.

Acidic swamps, wet woods, thickets.

Carex albursina E. Sheldon - . 2n = 44.

Moist, calcareous, deciduous woods and ravines.  [C. laxiflora Lamarck var. latifolia Boott]

Carex alopecoidea Tuckerman - . 2n = 68.

Calcareous meadows, swales, alluvial woods, low thickets.

Carex amphibola Steudel - . 2n = ?

Moist, deciduous woods.

Carex annectens (E. P. Bicknell) E. P. Bicknell - . 2n = ?

Sterile, often sandy soils, dry or moist.  [C. annectens var. xanthocarpa (Kükenthal) Wiegand; C. brachyglossa Mackenzie]

Carex appalachica J. M. Webber & P. W. Ball - . 2n = 52.

Deciduous or mixed woods, usually on sandy or rocky soils.

Carex aquatilis Wahlenberg var. aquatilis - . 2n = 72, 74-77, 79, 80.

Calcareous marshes, bogs, meadows and shores.  [C. aquatilis Wahlenberg var. altior misapplied]

Carex aquatilis Wahlenberg var. substricta Kükenthal - . 2n = 76, 77.

Neutral or calcareous marshes and shores.

Carex arcta Boott - . 2n = 60.

Wet woods, alluvial thickets, shores and meadows.

Carex arctata Boott - .  2n = 52, 54, 56.

Woods.

Carex argyrantha Tuckerman ex Dewey - . 2n = 80.

Dry, open woods on acidic, rocky or sandy soils.

Carex atherodes Sprengel - . 2n = ?

Calcareous meadows, wet, open thickets, shores.

Carex atlantica L. H. Bailey subsp. atlantica - . 2n = ?

Bogs and other sphagnous soils.  [C. incomperta E. P. Bicknell]

Carex atlantica L. H. Bailey subsp. capillacea (L. H. Bailey) Reznicek - . 2n = ?

Bogs, wet, acidic soils.  [C. howei Mackenzie]

Carex atratiformis Britton - . 2n = ?

Ravines, damp slopes, shores, often calcareous or circumneutral.

Carex aurea Nuttall - . 2n = 52.

Meadows, springy banks, shores, usually on basic soil.

Carex backii Boott - . 2n = 66.

Dry, rocky or sandy woods and bluffs.

Carex baileyi Britton - . 2n = ?

Shores, swampy woods, meadows, usually in acidic soils.

Carex barrattii Schweinitz & Torrey - . 2n = ?

Bogs, swamps, wet woods, usually in acidic soils.

Carex bebbii (L. H. Bailey) Olney ex Fernald - . 2n = 68, 70.

Shores, meadows, forest seeps, usually in calcareous or neutral soils.

Carex bicknellii Britton - .  2n = 76, 78.

Dry slopes, fields, open woods, rock or sand barrens.

Carex bigelowii Torrey ex Schweinitz subsp. bigelowii - .  2n = 68-71.

Dry to moist alpine areas.

Carex blanda Dewey - .  2n = 30, 32, 34, 36.

Woods, deciduous or mixed, bottomlands, meadows.

Carex brevior (Dewey) Mackenzie ex Lunell - .  2n = 48, 52, 56, 60, 64, 68.

Dry open soil, often in calcareous or neutral soils.

Carex bromoides Schkuhr ex Willdenow subsp. bromoides - .  2n = 64, 66, 68.

Rich, low woods and swamps.

CAREX BRUNNEA Thunberg - .  2n = 62.

On "made-land" at or near coast, that is, on artificial fill. From east Asia and Australia.

Carex brunnescens (Persoon) Poiret subsp. brunnescens - .  2n = 56.

Rocky or turfy summits and slopes.

Carex brunnescens (Persoon) Poiret subsp. sphaerostachya (Tuckerman) Kalela - .  2n = 56.

[This taxon is not mapped since the specimens at Harvard including those of the New England Botanical Club are filed together with those of the typical variety with which it intergrades. None of the specimens have been annotated by modern specialists.]

Woods, clearings and rocky slopes.  [C. brunnescens var. sphaerostachya (Tuckerman) Kükenthal]

Carex bullata Schkuhr ex Willdenow - . 2n = ?

Bogs, boggy meadows, sphagnous or sandy shores.

Carex bushii Mackenzie - . 2n = 64.

Meadows, usually calcareous, grasslands, open woods.

Carex buxbaumii Wahlenberg - . 2n = ca. 106.

Shores, meadows, swamps, marshes, bogs.

Carex canescens Linnaeus subsp. canescens - . 2n = 56.

Sphagnum bogs, swamps, moist, coniferous woods, meadows.  [C. canescens var. subloliacea sensu Fernald]

Carex canescens Linnaeus subsp. disjuncta (Fernald) Toivonen - . 2n = 56.

Sphagnum bogs, swamps, moist, coniferous woods, meadows.  [C. canescens var. disjuncta Fernald]

Carex capillaris Linnaeus - . 2n = 54.

Alpine regions. [C. capillaris var. elongata Olney ex Fernald; C. capillaris var. major Blytt]

Carex capitata Linnaeus - . 2n = 50.

Heaths of boreal woods, alpine zones.

CAREX CARYOPHYLLEA Latourette - . 2n = 58, 62, 64, 66, 68.

Dry roadsides, pastures and graveyards. From Europe.

Carex castanea Wahlenberg - . 2n = 44, 64.

Calcareous woods, cedar swamps, meadows.

Carex cephaloidea (Dewey) Dewey - . 2n = 50.

Rich woods, bottomlands and forest margins, on neutral or basic soils.  [C. sparganioides Muhlenberg ex Willdenow var. cephaloidea (Dewey) J. Carey]

Carex cephalophora Muhlenberg ex Willdenow - . 2n = 48.

Dry, deciduous or mixed woods and openings.

Carex chordorrhiza Ehrhart ex Linnaeus - Creeping Sedge. 2n = 60.

Quagmires, bogs, lake shores.

Carex collinsii Nuttall - . 2n = ?

Sphagnum bogs, sphagnous wooded swamps, typically under Picea mariana or Chamaecyparis thyoides.

Carex communis L. H. Bailey var. communis - . 2n = 28.

Woods, slopes, ledges, clearings.

Carex comosa Boott - . 2n = ?

Swamps, shores, marshes, meadows.

Carex conoidea Willdenow - Field Sedge. 2n = ?

Grassy meadows and shores, usually in acidic sands or gravel.  [C. katahdinensis Fernald]

Carex crawei Dewey - . 2n = 38, 59, 60.

Calcareous shores, gravels, meadows, glades and quarries.

Carex crawfordii Fernald - . 2n = 52, ca. 66, 70.

Open ground, wet or dry.

Carex crinita Lamarck var. crinita - . 2n = 66, 68.

Swamps, marshes, bogs, shores, meadows, low woods, swales. [C. crinita var. minor Boott]

Carex crinita Lamarck var. brevicrinis Fernald - . 2n = 66.

Wooded swamps, shores, low woods.  [The location of the voucher specimens for Connecticut, Massachusetts, and Rhode Island used by Flora North America Editorial Committee (2002) is unknown.]

Carex cristatella Britton - . 2n = 70.

Meadows, damp woods, marshes, stream banks.

Carex cryptolepis Mackenzie - . 2n = 64.

Shores, on acidic, sandy or organic soil.

Carex cumulata (L. H. Bailey) Mackenzie - . 2n = 36, 38.

Acidic soils, dry or moist, open or wooded, often associated with Polytrichum.

Carex davisii Schweinitz & Torrey - . 2n = ?

Rich, calcareous, deciduous woods, meadows, shores.

Carex debilis Michaux var. debilis - . 2n = 52, 54, 55, 56.

Moist, deciduous woods, edges, clearings swamps, usually in soils with pH below 6.

Carex debilis Michaux var. rudgei L. H. Bailey - . 2n = 50, 52, 54, 56, 60.

Open, moist, deciduous, woods, edges, clearings, meadows, usually on soils with pH below 6.  [C. debilis var. interjecta L. H. Bailey; C. debilis var. strictior L. H. Bailey]

Carex deflexa Hornemann var. deflexa - Northern Sedge. 2n = 20-24, 30, 36.

Woods, clearings, turfy or rocky slopes.

Carex deweyana Schweinitz var. deweyana - . 2n = 54.

Rich, open woods, woodland edges.

Carex diandra Schrank - Panicled Sedge. 2n = 48, 50, 54, 60.

Swampy, marshy or boggy areas, often calcareous.

Carex digitalis Willdenow var. digitalis - . 2n = 48.

Deciduous or mixed woods.

Carex disperma Dewey - . 2n = 70.

Mossy or damp coniferous woods, bogs, clearings.  [C. tenella Schkuhr]

Carex eburnea Boott - . 2n = ?

Calcareous ledges, gravels or sands.

Carex echinata Murray subsp. echinata - . 2n = 58.

Sphagnous soils.  [C. angustior Mackenzie; C. cephalantha (L. H. Bailey) E. P. Bicknell;
C. laricina Mackenzie ex Bright; C. muricata Linnaeus var. angustata (Carey) Carey ex Gleason;
C. muricata Linnaeus var. laricina (Mackenzie ex Bright) Gleason]

Carex emoryi Dewey - . 2n = 72.

Swamps, shores, most often in basic or calcareous waters.

Carex exilis Dewey - . 2n = ?

Sphagnum bogs, fens.

Carex festucacea Schkuhr - . 2n = 68, 70.

Wet or seasonally wet places, low woods.

CAREX FLACCA Schreber - . 2n = ?

Abandoned quarries, ditches, marshes.

Carex flava Linnaeus - Yellow Sedge. 2n = 60.

Moist to wet habitats on calcareous soils.  [C. flava var. fertilis Peck; C. flava var. gaspensis Fernald; C. flava var. laxior (Kükenthal) Gleason]

Carex foenea Willdenow - . 2n = 82, 84.

Dry, open, usually acidic soil.  [C. aenea Fernald]

Carex folliculata Linnaeus - . 2n = 56.

Wet woods, bogs, shores, in acidic, sandy or sphagnous soils.

Carex formosa Dewey - Thicket Sedge. 2n = ?

Calcareous, deciduous woods, meadows.

Carex garberi Fernald - . 2n = ?

Calcareous shores, meadows, shaded ledges.  [C. garberi var. bifaria Fernald]

Carex glaucodea Tuckerman ex Olney - . 2n = ?

Calcareous, deciduous woods.  [C. flaccosperma Dewey var. glaucodea (Tuckerman ex Olney) Kükenthal]

Carex gracilescens Steudel - . 2n = 33, 38, 40.

Rich woods, woodland edges, frequently in calcareous soil.  [C. laxiflora Lamarck var. gracillima (Boott) B. L. Robinson & Fernald]

Carex gracillima Schweinitz - . 2n = 50, 52, 54.

Woods, woodland edges, meadows, roadsides.

Carex granularis Muhlenberg ex Willdenow - Meadow Sedge. 2n = 36, 38, 40, 42.

Calcareous woods, shores, meadows.  [C. granularis var. haleana (Olney) Porter]

Carex grayi J. Carey - . 2n = ?

Calcareous meadows, alluvial woods.  [C. grayi var. hispidula Gray]

Carex grisea Wahlenberg - . 2n = ?

Rich, deciduous woods, bottomlands, meadows.  [C. amphibola Steudel var. turgida Fernald]

Carex gynandra Schweinitz - . 2n = 66, 68.

Swamps, alluvial woods, meadows, marshes, bogs, shores.  [C. crinita Lamarck var. gynandra (Schweinitz) Schweinitz & Torrey; C. crinita Lamarck var. simulans Fernald]

Carex gynocrates Wormskjöld ex Drejer - . 2n = 46, 48.

Wet, sphagnous soils.  [C. dioica Linnaeus var. gynocrates (Wormskjöld ex Drejer) Ostenfeld]

Carex haydenii Dewey - . 2n = 54.

Wet meadows, thickets, mostly in rich soil.

Carex hirsutella Mackenzie - . 2n = 52.

Open woods, meadows, fields, in neutral to basic soils.  [C. complanata Torrey & Hooker var. hirsuta (L. H. Bailey) Gleason]

CAREX HIRTA Linnaeus - . 2n = 112-114.

Dry fields, roadsides, railroad embankments. From Europe.

Carex hirtifolia Mackenzie - . 2n = 50.

Rich woods and meadows, often calcareous.

Carex hitchcockiana Dewey - . 2n = ?

Rich or calcareous woods.

Carex hormathodes Fernald - . 2n = 74.

Brackish to freshwater marshes, coastal sands and rocks. [C. straminea Willdenow ex Schkuhr var. invisa W. Boott]

Carex hostiana de Candolle - . 2n = ?

Marshes, meadows, shores, glades in calcareous soils.  [C. hostiana var. laurentiana (Fernald & Wiegand) Fernald & Wiegand]   [Collected only once in New England, probably from Tewksbury, Massachusetts, prior to 1837.]

Carex houghtoniana Torrey ex Dewey - . 2n = ?

Dry, acid sands and gravels, rocky openings. [C. "houghtonii" Pursh - often used, but not as published]

Carex hystericina Muhlenberg ex Willdenow - . 2n = ?

Swamps, shores, meadows, seeps, mostly in calcareous soils.

Carex interior L. H. Bailey - . 2n = ?

Swamps, shores, meadows, seeps, often in calcareous soils.

Carex intumescens Rudge - . 2n = ?

Alluvial woods, wet meadows, swales.  [C. intumescens var. fernaldii L. H. Bailey]

CAREX KOBOMUGI Ohwi - . 2n = ?

Coastal sandy beaches. From east Asia.

Carex lacustris Willdenow - . 2n = 74.

Swamps, shores, meadows, marsh edges, in calcareous or circumneutral soil.

CAREX LAEVIGATA Smith - . 2n = 69-80.

From Europe.  [Collected only once in New England, probably from Tewksbury, Massachusetts, prior to 1837.]

Carex laevivaginata (Kükenthal) Mackenzie - . 2n = 46.

Swamps, meadows, marshes, alluvial bottomlands, especially in calcareous soils.

Carex lasiocarpa Ehrhart - . 2n = 56.

Rich meadows, bogs, shores, swales.  [C. lasiocarpa var. americana Fernald; C. lanuginosa Michaux]

Carex laxiculmis Schweinitz var. laxiculmis - . 2n = 44, 46.

Rich, moist woods.

Carex laxiflora Lamarck - . 2n = 40.

Rich woods. [C. laxiflora var. serrulata F. J. Hermann]

Carex lenticularis Michaux var. lenticularis - Shore Sedge. 2n = 86-88.

Shores, meadows, borders of alpine brooks. [C. lenticularis var. albimontana Dewey; C. lenticularis var. blakei Dewey]

CAREX LEPORINA Linnaeus - . 2n = ?

Dry pastures, roadsides. From farther west and Eurasia. [C. ovalis Goodenough - misapplied]

Carex leptalea Wahlenberg - . 2n = 50, 52.

Wet woods, swales, marshy fields.

Carex leptonervia (Fernald) Fernald - . 2n = 36.

Low woods, clearings, thickets.

Carex limosa Linnaeus - . 2n = ?

Bogs, meadows, shores.

Carex livida (Wahlenberg) Willdenow - . 2n = 32.

Calcareous meadows and bogs. [C. livida var. grayana (Dewey) Fernald; C. livida var. radicaulis Paine]

Carex longii Mackenzie - . 2n = 58, 62.

Wet, sandy or peaty soils.

Carex lucorum Willdenow ex Link var. lucorum - . 2n = 40.

Acidic, often sandy, soils in open pine and oak woods and clearings. [C. pensylvanica Lamarck var. distans Peck]

Carex lupuliformis Sartwell ex Dewey - . 2n = ?

Calcareous swamps, meadows, marshes.

Carex lupulina Willdenow - . 2n = ?

Wet woods, swamps, meadows. [C. lupulina var. pedunculata A. Gray]

Carex lurida Wahlenberg - . 2n = ?

Swamps, wet woods, shores, meadows, marshes, mostly in acidic soils.

Carex mackenziei V. I. Kreczetowicz - . 2n = 64.

Coastal saline or brackish marshes and shores.

Carex magellanica Lamarck subsp. irrigua (Wahlenberg) Hiitonen - Bog Sedge. 2n = ca. 60.

Sphagnous bogs, meadows, wet woods and marshes.  [C. paupercula Michaux; C. paupercula Michaux var. irrigua (Wahlenberg) Fernald; C. paupercula Michaux var. pallens Fernald]

Calcareous meadows, moist depressions, cedar glades.  [The location of the voucher specimen for Rhode Island used by Flora North America Editorial Committee (2002) is unknown.]

Carex media R. Brown ex Richardson - . 2n = ?

Mossy woods, meadows, shores, often in calcareous soil.  [C. norvegica misapplied; C. norvegica Retzius subsp. inferalpina (Wahlenberg) Hultén]

Carex merritt-fernaldii Mackenzie - . 2n = 70, 74.

Dry rocky or gravelly places, dryish meadows, in acidic soil.

Carex mesochorea Mackenzie - . 2n = ?

Dry, open soil.  [C. cephalophora Muhlenberg ex Willdenow var. mesochorea (Mackenzie) Gleason]

Carex michauxiana Boeckeler - . 2n = ?

Bogs, shores, swamps, often acidic soils.

Carex mitchelliana M. A. Curtis - . 2n = 66.

Swamps, wet woods, shores, wet meadows. [C. crinita Lamarck var. mitchelliana (M. A. Curtis) Gleason]

Carex molesta Mackenzie ex Bright - . 2n = 68, 70.

Open areas, dry or moist, often in calcareous soils.

Carex muehlenbergii Schkuhr ex Willdenow var. muehlenbergii - . 2n = ?

Dry fields and open woods, often in sand.

Carex muehlenbergii Schkuhr ex Willdenow var. enervis Boott - . 2n = ?

Dry fields and open woods, often in sand.

Carex nigra (Linnaeus) Reichard - . 2n = 83, 84, 85.

Wet meadows, swamps, open turf, swales.  [C. nigra var. strictiformis (L. H. Bailey) Fernald]

Carex nigromarginata Schweinitz - . 2n = 36.

Dry woods, thickets, clearings in acidic soils.

Carex normalis Mackenzie - . 2n = 68.

Rich, open woods, thickets.

Carex novae-angliae Schweinitz - . 2n = ?

Mixed deciduous woods, usually moist.

CAREX OKLAHOMENSIS Mackenzie - . 2n = ?

Wet meadows, marshes. From farther south and west.

Carex oligocarpa Willdenow - . 2n = ?

Calcareous woods.

Carex oligosperma Michaux - . 2n = ?

Sphagnum bogs, acid swamps, shores.

Carex ormostachya Wiegand - . 2n = ?

Mixed or evergreen woods, frequently in sandy or rocky soil.  [C. laxiflora Lamarck var. ormostachya (Wiegand) Gleason]

Carex oronensis Fernald - . 2n = 74.

Fields, meadows, thickets.

Carex paleacea Schreber ex Wahlenberg - . 2n = 71, 72, 73.

Salt marshes, intertidal shores.

Carex pallescens Linnaeus - . 2n = 70.

Meadows, thickets.  [C. pallescens var. neogaea Fernald]

CAREX PANICEA Linnaeus - . 2n = 32.

Meadows, acidic fields. From Europe.

Carex pauciflora Lightfoot - . 2n = ca. 74, 76.

Sphagnum bogs.

Carex peckii Howe - . 2n = 36.

Calcareous rocky slopes, rich, open woods.  [C. nigromarginata Schweinitz var. elliptica (Boott) Gleason; C. nigromarginata Schweinitz var. minor (Boott) Gleason]

Carex pedunculata Muhlenberg ex Willdenow - . 2n = 26.

Rich woods.

Carex pellita Willdenow - . 2n = 78.

Meadows, marshes, shores, especially in calcareous soils.  [C. lasiocarpa Ehrhart var. latifolia (Boeckeler) Gilly]

Carex pensylvanica Lamarck - Early Sedge. 2n = 36.

Open, dry soil, open woods.

Carex plantaginea Lamarck - . 2n = 50, 52.

Rich, deciduous or mixed woods.

Carex platyphylla J. Carey - . 2n = 68, 70; n = 32 + (3), 33 + (3), 33 + (4).

Rich, deciduous woods, rocky slopes.

Carex polymorpha Muhlenberg - . 2n = ?

Dry, sandy soil of open woods and clearings.

CAREX PRAEGRACILIS W. Boott - . 2n = ?

Low, open ground, shores. From farther west.

Carex prairea Dewey - . 2n = 66.

Calcareous bogs, meadows, swamps.

Carex prasina Wahlenberg - Drooping Sedge. 2n = 60.

Rich, low woods, meadows.

Carex praticola Rydberg - . 2n = 76, 78.

Open woods, dry clearings, meadows.

Carex projecta Mackenzie - . 2n = 64.

Damp woods, thickets, meadows, shores.

Carex pseudo-cyperus Linnaeus - . 2n = 66.

Shores, swamps, bogs.

Carex radiata (Wahlenberg) Small - . 2n = 58.

Moist woods.

Carex rariflora (Wahlenberg) Smith - . 2n = 52.

Peaty barrens, bogs.

Carex recta Boott - . 2n = 73, 75, 76.

Salt marshes, brackish meadows.  [C. salina Wahlenberg var. kattegatensis (Fries ex Lindmann) S. O. I. Almquist]

Carex retroflexa Muhlenberg ex Willdenow - . 2n = 40.

Dry, rocky, open, deciduous woods.

Carex retrorsa Schweinitz - . 2n = ?

Alluvial woods, low grounds, swamps, shores.

Carex richardsonii R. Brown - . 2n = 52.

Calcareous rocks, open woods.

Carex rosea Schkuhr ex Willdenow - . 2n = 52.

Dry, open woods.  [C. convoluta Mackenzie]

Carex rostrata Stokes - . 2n = 60.

Shores, swamps, bogs.  [C. rostrata var. ambigens Fernald]

Carex saxatilis Linnaeus - . 2n = 78, 80.

Sphagnous shores.  [C. saxatilis var. miliaris (Michaux) L. H. Bailey; C. saxatilis var. rhomalea Fernald; C. miliaris Michaux]

Carex scabrata Schweinitz - . 2n = 54.

Wet woods.

Carex schweinitzii Dewey ex Schweinitz - . 2n = ?

Calcareous swamps, meadows and shores.

Carex scirpoidea Michaux subsp. scirpoidea - . 2n = ?

Rocky ledges at high altitudes, often in calcareous soil.

Carex scoparia Schkuhr ex Willdenow var. scoparia - Broom Sedge. 2n = 56, 58, 60, 68.

Open areas, usually in acidic, often sandy soil.

Carex scoparia Schkuhr ex Willdenow var. tessellata Fernald & Wiegand - . 2n = ?

Sandy, acidic soils.

Carex seorsa Howe - . 2n = ?

Wet woods, swamps, bogs.

Carex siccata Dewey - . 2n = 70.

Open, sandy woods, fields, and rock outcrops.

Carex silicea Olney - . 2n = 74, 76.

Coastal sandy beaches and dunes.

Carex sparganioides Muhlenberg ex Willdenow - . 2n = 46, 48.

Rich woods.

CAREX SPICATA Hudson - . 2n = 58.

Dry fields, roadsides and open woods. From Eurasia.

Carex sprengelii Dewey ex Sprengel - . 2n = 42.

Rocky woods, alluvial thickets, river terraces, often in calcareous soil.

Carex squarrosa Linnaeus - . 2n = 56.

Meadows and low woods.

Carex sterilis Willdenow - . 2n = ?

Wet, calcareous soil.  [C. elachycarpa Fernald; C. muricata Linnaeus var. sterilis (Carey) Gleason]

Carex stipata Muhlenberg ex Willdenow var. stipata - . 2n = 52.

Swamps, marshes, alluvial bottomlands, meadows, bogs.

Carex straminea Willdenow - . 2n = 74.

Swamps, freshwater marshes, meadows, swales, in sandy or peaty, acidic soils.

Carex striata Michaux - . 2n = ?

Pond shores, in acidic, often peaty, soils.  [C. walteriana L. H. Bailey; C. walteriana L. H. Bailey var. brevis L. H. Bailey]

Carex striatula Michaux - . 2n = 36, 40.

Rich, deciduous or mixed woods.  [C. laxiflora Lamarck var. angustifolia Dewey]

Carex stricta Lamarck Tussock Sedge - . 2n = ?

Swamps, shores, meadows.  [C. stricta Lamarck var. strictior (Dewey) J. Carey]

Carex styloflexa Buckley - . 2n = 48.

Moist, rich woods, springheads.

Carex swanii (Fernald) Mackenzie - . 2n = 54.

Woods, often dry, thickets, clearings.

Carex sychnocephala J. Carey - . 2n = 64.

Open, sandy or peaty shores.

Carex tenera Dewey var. tenera - . 2n = 52, 54, 56.

Meadows, open woods.

Carex tenuiflora Wahlenberg - . 2n = 58.

Sphagnum bogs, mossy woods.

Carex tetanica Schkuhr - . 2n = ?

Calcareous bogs.

Carex tincta (Fernald) Fernald - . 2n = 36 + IV.

Fields, open woods.

Carex tonsa (Fernald) E. P. Bicknell var. tonsa - . 2n = 32.

Dry, sandy fields, openings and roadsides.

Carex tonsa (Fernald) E. P. Bicknell var. rugosperma (Mackenzie) Crins - . 2n = ?.

Dry, sandy fields, openings and roadsides.  [C. rugosperma Mackenzie]

Carex torta Boott - . 2n = 66.

Stream banks.

Carex tribuloides Wahlenberg var. tribuloides - . 2n = 70.

Bottomlands, swales, meadows.

Carex trichocarpa Willdenow - . 2n = ?

Calcareous marshes, bottomlands and meadows.

Carex trisperma Dewey - . 2n = 60.

Sphagnous, wet woods and bogs.  [C. trisperma var. billingsii O. W. Knight]

Carex tuckermanii Dewey - . 2n = ?

Meadows, shores, swamps.

Carex typhina Michaux - . 2n = ?

Shores, meadows, wet woods.

Carex umbellata Schkuhr ex Willdenow Sand Sedge - . 2n = 30, 32.

Dry soil in open woods, clearings and fields.  [C. abdita E. P. Bicknell]

Carex utriculata Boott - . 2n = ?

Swamps, marshes, meadows, bogs, shores.  [C. rostrata var. utriculata (Boott) L. H. Bailey]

Carex vacillans Drejer - . 2n = 78, 79.

Coastal shores and salt marshes.

Carex vaginata Tausch - . 2n = 32.

Calcareous bogs, swamps and boggy woods.

Carex vesicaria Linnaeus - . 2n = 70, 74, 82, 88.

Swamps, meadows, marshes, shores.  [C. vesicaria var. distenta Fries; C. vesicaria var. monile (Tuckerman) Fernald; C. vesicaria var. raeana (Boott) Fernald)]

Carex vestita Willdenow Stiff Sedge - . 2n = ?

Dry, sandy woods and clearings.

Carex virescens Muhlenberg ex Willdenow - . 2n = 60.

Dry woods, clearings.

Carex viridula Michaux subsp. viridula var. viridula - . 2n = 70, 72.

Shores, often calcareous, springy places.

CAREX VIRIDULA Michaux subsp. OEDOCARPA (Andersson) B. Schmid - . 2n = 68, 70.

Shores and meadows, in acidic soil.  From Europe and northwestern Africa.  [C. demissa Hornemann]

Carex vulpinoidea Michaux - . 2n = 52.

Low, open ground, shores, meadows, marshes.  [C. setacea Dewey]

Carex wiegandii Mackenzie - . 2n = ?

Bogs and sphagnous areas.

Carex willdenowii Schkuhr - . 2n = 62, 78.

Dry, rocky, acidic woods.

CAREX hybrids

Carex X aestivaliformis Mackenzie - .

[C. aestivalis M. A. Curtis ex A. Gray X C. gracillima Schweinitz]

Carex bebbii (L. H. Bailey) Olney ex Fernald X Carex scoparia Schkuhr ex Willdenow var. scoparia - .

Carex comosa Boott X Carex lurida Wahlenberg - .

Carex crinita Lamarck X Carex lacustris Willdenow - .

Carex crinita Lamarck X Carex scabrata Schweinitz - .

Carex crinita Lamarck X Carex torta Boott - .

Carex crinita Lamarck X Carex vesicaria Linnaeus - .

Carex cryptolepis Mackenzie X Carex flava Linnaeus - .

Carex cryptolepis Mackenzie X Carex viridula Michaux subsp. viridula var. viridula - .

Carex cumulata (L. H. Bailey) Mackenzie X Carex scoparia Schkuhr ex Willdenow var. scoparia - .

Carex digitalis Willdenow X Carex laxiculmis Schweinitz var. laxiculmis - .

Carex echinata Murray var. echinata X Carex interior L. H. Bailey - .

Carex gracillima Schweinitz X Carex virescens Muhlenberg ex Willdenow - .

Carex gynandra Schweinitz X Carex scabrata Schweinitz - .

Carex X hartii Dewey - .

[C. lurida Wahlenberg X C. retrorsa Schweinitz]

Carex hormathodes Fernald X Carex scoparia Schkuhr ex Willdenow var. scoparia - .

Carex X knieskernii Dewey - .

[C. arctata Boott X C. castanea Wahlenberg]

Carex lasiocarpa Ehrhart X Carex stricta Lamarck - .

Carex X limula (Fries) Raymond - .

[C. aquatilis Wahlenberg var. aquatilis X C. bigelowii Torrey ex Schweinitz subsp. bigelowii]

Carex lupulina Willdenow X Carex lurida Wahlenberg - .

Carex lurida Wahlenberg X Carex mitchelliana M. A. Curtis - .

Carex lurida Wahlenberg X Carex utriculata Boott - .

Carex X mainensis Porter ex Britton - .

[C. saxatalis Linnaeus X C. vesicaria Linnaeus; C. X stenolepis Porter ex Britton]

Carex X olneyi Boott - .

[C. bullata Schkuhr ex Willdenow X C. utriculata Boott]

Carex paleacea Schreber ex Wahlenberg X Carex stricta Lamarck - .

Carex pensylvanica Lamarck X Carex umbellata Schkuhr ex Willdenow - .

Carex X pseudohelvola Kihlman - .

[C. canescens Linnaeus subsp. canescens X C. mackenziei V. I. Kreczetowicz]

Carex X ruedtii Kneucker - .

[C. flava Linnaeus X C. viridula Michaux subsp. viridula var. viridula; C. X subviridula (Kükenthal) Fernald]

Carex X saxenii Raymond - .

[C. paleacea Schreber ex Wahlenberg X C. recta Boott]

Carex scoparia Schkuhr ex Willdenow var. scoparia X Carex straminea Willdenow - .

Carex scoparia Schkuhr ex Willdenow var. scoparia X Carex tincta (Fernald) Fernald - .

Carex scoparia Schkuhr ex Willdenow var. scoparia X Carex tribuloides Wahlenberg var. tribuloides - .

Carex X sullivantii Boott - .

[C. gracillima Schweinitz X C. hirtifolia Mackenzie]

Carex tenera Dewey var. tenera X Carex tincta (Fernald) Fernald - .

Carex X trichina Fernald - .

[C. tenuiflora Wahlenberg X C. trisperma Dewey]