Thrall Dam

Thrall Dam is a topographically complex site formed by beaver dams along a feeder stream of the North Branch. Part of the site is open water with a organic bottom, but the majority of it is dominated by different associations of sedges and alders.

Species found at this site:

Scientific Name

Common Name

Acer rubrum  L.  var rubrum

red maple

Agalinus tennuifolia (Vahl) Raf.

slender false foxglove

Agrostis gigantea  Roth

redtop

Alnus incana ssp rugosa (DuRoi) Clausen

speckled alder

Arisaema triphyllum (L.) Schott ssp triphyllum   

jack in the pulpit

Arisaema triphyllum (L.) Schott ssp triphyllum   

jack in the pulpit

Betula papyrifera var papyifera Marsh

paper birch

Boehmeria cylindrica (L.) Sw.

false nettle

Carex aquatilis  Wahlenb.  var aquatilis

water sedge

Carex comosa Boott

longhair sedge

Carex lurida Wahlenb.

shallow sedge

Carex retrorsa  Schwein

knot sedge

Carex stipata Muhl. ex Willd. var stipata

awl fruited sedge

Carex stricta Lam.

tussock sedge

Carpinus caroliniana ssp virginiana (Marsh.) Furlow

american hornbeam, musclewood

Chelone glabra L.

white turtlehead

Cornus amomum P. Mill.

silky dogwood

Cornus obliqua  Raf.

silky dogwood

Cornus racemosa Lam.

red panicled dogwood

Epilobium coloratum Biehler

eastern willow herb

Eupatorium fistulosum  (Barratt) King & H.E. Robins.

hollow joe-pye weed

Eupatorium maculatum L. var maculatum

spotted joe-pye weed

Eupatorium perfoliatum L. var perfoliatum  

boneset

Galium asperellum Michx.

rough bedstraw

Galium palustre  L.

marsh bedstraw

Hydrocotyle americanum  L.

marshpennywort

Ilex verticillata (L.) Gray

winterberry holly

Impatiens capensis Meerb.

jewelweed

Iris versicolor L.

blue flag

Juncus effusus  L.

soft rush

Leersia oryzoides  (L.) Sw.

rice cutgrass

Lemna minor L.

lesser duckweed

Lycopus americanus Muhl. ex W. Bart.

cut-leaf water horehound

Lycopus virginicus L.

water horehound

Lysimachia nummularia L.

moneywort

Lysimachia terrestris (L.) B.S.P.

swamp candles

Lythrum salicaria L.

purple loosestrife

Matteuccia struthiopteris (L.) Todaro

ostrich fern

Oenothera perennis L.

little sundrops

Onoclea sensibilis L.

sensitive fern

Osmunda cinnamomea var cinnamomea L.

cinnamon fern

Osmunda regalis var spectabilis (Willd.) Gray

royal fern

Oxalis stricta L.

common yellow sorrel

Pinus strobus L.

white pine

Polygonum amphibium L. var emersum Michx.

smartweed

Polygonum hydropiper L.

marshpepper smartweed

Polygonum sagittatum L.

arrow-leaved tearthumb

Potamogeton gramineus L.

variable-leaved pondweed

Potamogeton natans L.

floating pondweed

Potentilla norvegica L. ssp monspeliensis (L.) Aschers. & Graebn.

rough cinquefoil

Rubus alleghiensis  Porter  var alleghiensis

common blackberry

Sagittaria cuneata  Sheldon

arumleaf arrowhead

Sagittaria latifolia Willd.

broadleaf arrowhead

Salix petiolaris Sm.

slender or meadow willow

Salix sericea  Marsh.

silky willow

Schoenoplectus tabernaemontani (K.C. Gmel.) Palla

softstem bulrush

Scirpus atrocinctus  Fern.

blackgirdle bulrush

Scirpus atrovirens Willd.

dark green bulrush

Scirpus cyperinuus (L.) Kunth

wool-rush

Scutellaria galericulata L.

marsh skullcap

Solidago canadensis L. var canadensis 

canada goldenrod

Solidago gigantea Ait.

smooth goldenrod

Sparganium emersum  Rehmann

european bur-reed

Spiraea alba  DuRoi var alba

meadowsweet

Spiraea alba  DuRoi var latifolia (Ait.) Dippel

white meadowsweet

Spiraea tomentsa L. var tomentosa

steeplebush

Thalictrum pubescens Pursh

king of the meadow, tall meadow rue

Thelypteris palustris Schott var pubescens (Lawson) Fern.

eastern marsh fern

Triadenum virginicum (L.) Raf.

marsh st. john'swort

Typha angustifolia L.

narrow leaved cattail

Typha latifolia L.

wide leaved cattail

 

GPS coordinates of sampling points:

Sampling point

e

n

TD1A

e

615123

n

490770

TD1B

e

615123

n

4902218

TD1C

e

615123

n

4902230

TD1D

e

615123

n

4902246

TD1E

e

615123

n

4902277

TD1F

e

615123

n

4902284

TD2A

e

4912135

n

614912

TD2B

e

4912135

n

614949

TD2C

e

4912135

n

614980

TD3A

e

4902000

n

6124860

TD3B

e

4902000

n

6124893

TD3C

e

4902000

n

6124926

TD3D

e

4902000

n

6124941

 

 

 

If you have comments/questions, please contact Dr. Meiyin Wu, Dr. Dennis Kalma or Boquet River Association

This page was last updated on January 09, 2007 .