In New York, Small Bur-reed has been found in a wide variety of habitats with still, open water. It occurs in small pools within both bogs and fens, as well as in Northern White-cedar swamps, beaver ponds, and shrub swamps (New York Natural Heritage Program 2011). Small open water pools at edge of fen mat; open water sections of fen near open stream flow; mucky shrub swamps with open water zones; mountain pool surrounded by trees; small swamps surrounded by northern white cedar woods; open water within willow swamps; open water in dwarf shrub bogs; submergent/emergent communities along a beaver affected area along streams; dwarf shrub bogs with small stream channels of wet peat; shallow depressions within shrub and hummock swamps; (New York Natural Heritage Program 2011). Cool, quiet, slightly acid to somewhat basic waters of bays, pools, ditches, and peat bogs, usually in shallow water but sometimes to 60 cm depth (FNA 2000). Clean, relatively still, shallow waters of lakes, ponds, bog pools, limestone sinkholes, small creeks, interdunal ponds, and deepwater marshes; often in alkaline water (Jenkins 1990). Ponds, bogs, beach pools and interdunal swales (of the Great Lakes), and other wet places (Voss 1972). Shallow pools, brooks, springs, etc. (Fernald 1970).

Bog lake* The aquatic community of a lake that typically occurs in a small, shallow basin (e.g., a kettehole) that is protected from wind and is poorly drained. These lakes occur in areas with non-calcareous bedrock or glacial till; many are fringed or surrounded by a floating mat of vegetation. * probable association but not confirmed Dwarf shrub bog A wetland usually fed by rainwater or mineral-poor groundwater and dominated by short, evergreen shrubs and peat mosses. The surface of the peatland is usually hummocky, with shrubs more common on the hummocks and peat moss throughout. The water in the bog is usually nutrient-poor and acidic. Hemlock-hardwood swamp* A swamp that occurs on mineral soils and deep muck in depressions which receive groundwater discharge. These swamps usually have a fairly closed canopy (70 to 90% cover), sparse shrub layer, and low species diversity. The tree canopy is typically dominated by eastern hemlock and co-dominated by yellow birch and red maple. * probable association but not confirmed Inland poor fen* A wetland fed by acidic water from springs and seeps. Plant remains in these fens do not decompose rapidly and thus the plants in these fens usually grow on older, undecomposed plant parts of mostly sphagnum mosses. * probable association but not confirmed Medium fen* A wetland fed by water from springs and seeps. These waters are slightly acidic (pH values generally range from 4.5 to 6.5) and contain some dissolved minerals. Plant remains in these fens do not decompose rapidly and thus the plants in these fens usually grow on older, undecomposed plant parts of woody material, grasses, and mosses. * probable association but not confirmed

Northern white cedar swamp A swamp that occurs on organic soils in cool, poorly drained depressions in central and northern New York, and along lakes and streams in the northern half of the state. These swamps are often spring-fed with continually saturated soils. Soils are often rich in calcium. The characteristic tree is northern white cedar, which makes up more than 30% of the canopy cover. Oligotrophic pond* The aquatic community of a small, shallow, nutrient-poor pond. The water is very clear, and the bottom is usually sandy or rocky. * probable association but not confirmed Rich graminoid fen* A wetland of mostly grasses usually fed by water from highly calcareous springs or seepage. These waters have high concentrations of minerals and high pH values, generally from 6.0 to 7.8. Plant remains do not decompose rapidly and these grasses usually grow on older, undecomposed plant parts. * probable association but not confirmed Rich shrub fen* A wetland with many shrubs that is usually fed by water from springs and seeps. These waters have high concentrations of minerals and high pH values, generally from 6.0 to 7.8. Plant remains in these fens do not decompose rapidly and thus the plants in these fens usually grow on older, undecomposed woody plant parts. * probable association but not confirmed Shrub swamp An inland wetland dominated by tall shrubs that occurs along the shore of a lake or river, in a wet depression or valley not associated with lakes, or as a transition zone between a marsh, fen, or bog and a swamp or upland community. Shrub swamps are very common and quite variable.

Balsam Fir (Abies balsamea) Red Maple (Acer rubrum) Northern Water-plantain (Alisma triviale) Speckled Alder (Alnus incana ssp. rugosa) Swamp Milkweed (Asclepias incarnata) Water-shield (Brasenia schreberi) Wild Calla (Calla palustris) Bristly Sedge (Carex comosa) Yellow Sedge (Carex flava) Mountain Fringed Sedge (Carex gynandra) Boreal Bog Sedge (Carex magellanica) Cyperus-like Sedge (Carex pseudocyperus) Retrorse Sedge (Carex retrorsa) Broom Sedge (Carex scoparia) Common Hornwort (Ceratophyllum demersum) Leatherleaf (Chamaedaphne calyculata) White Turtlehead (Chelone glabra) Bulb-bearing Water-hemlock (Cicuta bulbifera) Marsh Cinquefoil (Comarum palustre) Red Osier Dogwood (Cornus sericea) Needle Spikerush (Eleocharis acicularis) Matted Spikerush (Eleocharis intermedia) Tawny Cotton-grass (Eriophorum virginicum) Black Ash (Fraxinus nigra) Black Huckleberry (Gaylussacia baccata) Common Frogbit (Hydrocharis morsus-ranae) Spotted Jewelweed (Impatiens capensis)

Blueflag (Iris versicolor) Common Rush (Juncus effusus) Sheep-laurel (Kalmia angustifolia) Tamarack (Larix laricina) Bog Buckbean (Menyanthes trifoliata) Slender Naiad (Najas flexilis) Mountain Holly (Nemopanthus mucronatus) Varigated Yellow Pond-lily (Nuphar variegata) Sensitive Fern (Onoclea sensibilis) Cinnamon Fern (Osmunda cinnamomea) Royal Fern (Osmunda regalis) Pickerelweed (Pontederia cordata) (Potamogeton) Marsh Mermaidweed (Proserpinaca palustris) Bebb's Willow (Salix bebbiana) Woolgrass Bulrush (Scirpus atrovirens) Bur-reed (Sparganium emersum) Marsh Fern (Thelypteris palustris) Northern White Cedar (Thuja occidentalis) Marsh St. John's Wort (Triadenum virginicum) Broad-leaf Cattail (Typha latifolia) Flatleaf Bladderwort (Utricularia intermedia) Greater Bladderwort (Utricularia macrorhiza) Lesser Bladderwort (Utricularia minor) Lowbush Blueberry (Vaccinium angustifolium) Highbush Blueberry (Vaccinium corymbosum)