Woodmill Road, Chappaqua, Westchester County, NY
92 acres

[pronounced Prine]


Saw Mill River Parkway north to exit 32 (mileage marker 21.52) for Chappaqua and Route 120. Turn left at the stop sign and go right at the light on Route 120 (Quaker Street) north to Millwood Road (Route 133) intersection and turn right (east) on Route 133. Woodmill Road is first right hand road. Park on right side of Woodmill Road being careful not to block sanctuary entrance or nearby residential driveways.

Alternatively, continue on Route 133 past Choate Sanctuary and past traffic light at Seven Bridges Road. Woodmill Road is on the left, one mile past Seven Bridges Road. Sanctuary entrance is on the right at the end of Woodmill Road.


Saw Mill River Audubon Society sanctuaries are open year-round from dawn until dusk for members and the general public for study and enjoyment. Guided group tours of the sanctuaries are available upon request. Trail maps are available for the six sanctuaries with trails and bird lists and nature trail booklets are available for Brinton Brook and Pruyn Sanctuaries.

Pruyn Sanctuary was first established by Agnes K. And Dr. F. Morgan Pruyn, long-time residents of Chappaqua, in 1966 through a gift of 16 acres to Saw Mill River Audubon Society. Small parcels of two and four acres each were added by the Benedict and Allison families respectively from their nearby properties.

In 1978, Dr. Pruyn purchased 31 acres of the valley saving it from development and donated them to the Society as well. Agnes K. Pruyn passed away in April 1975. Dr. F. Morgan Pruyn continued to maintain and improve their land adjoining the sanctuary and took an active role in supporting the Society until his death in May 1988.

The Pruyns willed to the Society the remaining acreage of their property along Millwood Road (Route 133) and their residence that now houses the office of the Saw Mill River Audubon Society. Pruyn Sanctuary, originally Gedney Brook Sanctuary, was renamed in honor of the Pruyns in April 1990.

An additional 14 acres, the Crystal Spring parcel, was added to the sanctuary in 1997 and a donation from Alok Aggarwal, a local developer. Nestle was a previous owner of this property during the 60s when spring water was piped and bottled from this area.


Oak maple woods, rock outcroppings, large red maple swamp with boardwalk, old orchard and meadow.


Dr. Patrick L. Cooney

Acer japonica (Japanese maple)
Acer rubrum (red maple)
Acer saccharum (sugar maple)
Betula lenta (black birch)
Carpinus caroliniana (musclewood)
Carya tomentosa (mockernut hickory)
Castanea dentata (American chestnut)
Cornus florida (flowering dogwood) 5/05/00 5/9/95 5/24/95
Fagus grandifolia (American beech)
Fraxinus americana (white ash) 5/16/95
Larix decidua (European larch)
Liriodendron tulipifera (tulip tree)
Nyssa sylvatica (tupelo)
Prunus serotina (black cherry)
Pyrus malus (apple) 5/05/00
Pyrus sp. (crab apple) 5/05/00
Quercus alba (white oak)
Quercus rubra (red oak)
Quercus velutina (black oak)
Tsuga canadensis (eastern hemlock)
Ulmus americana (American elm)
Ulmus rubra (slippery elm) -- everything fuzzy even leaf

Alnus sp. (alder)
Amelanchier arborea (shadbush) 4/29/93
Berberis thunbergii (Japanese barberry) 5/05/00 5/9/95 5/16/95
Cephalanthus occidentalis (button bush)
Cornus amomum (swamp dogwood)
Corylus americana (American hazel)
Euonymus alatus (winged euonymus) 5/24/95 6/2/94
Hamamelis virginiana (witch hazel)
Ilex verticillata (winterberry holly)
Ligustrum sp. (privet)
Lindera benzoin (spicebush) 4/24/95 4/29/93
Mitchella repens (partridgeberry)
Rhododendron periclymenoides (pinxter flower)
Rhododendron sp. (azalea)
Rhododendron viscosum (swamp azalea)
Rosa multiflora (multiflora rose)
Rubus flagellaris (swamp dewberry)
Rubus occidentalis (black raspberry)
Rubus phoenicolasius (wineberry)
Rubus sp. (blackberry)
Salix discolor (pussy willow) 4/29/93
Sambucus canadensis (common elderberry)
Vaccinium corymbosum (highbush blueberry) 4/29/93 5/05/00 5/16/95
Vaccinium pallidum (hillside blueberry)
Viburnum acerifolium (maple-leaf viburnum)
Viburnum dentatum (arrowwood viburnum)
Viburnum lentago (sweet viburnum) 5/16/95 soon 6/2/94 waning
Viburnum prunifolium (blackhaw viburnum) 5/16/95

Amphicarpaea bracteata (hog peanut)
Celastrus orbiculatus (Asiatic bittersweet)
Lonicera japonica (Japanese honeysuckle)
Parthenocissus quinquefolia (Virginia creeper)
Toxicodendron radicans (poison ivy)
Vitis sp. (grape vines)

Alliaria petiolata (garlic mustard) 4/29/93 5/05/00 5/31/95
Allium tricoccum (wild leek)
Allium vineale (field garlic)
Anemone quinquefolia (wood anemone) 5/05/00
Arisaema triphyllum (jack-in-the-pulpit) 5/9/95 5/16/95
Callitriche sp. (water starwort)
Caltha palustris (marsh marigold) 4/24/95 5/05/00 5/9/95
Cardamine diphylla (toothwort) 5/9/95
Cardamine pensylvanica (Pennsylvania bittercress) 5/05/00 5/16/95
Cardamine rhomboidea (spring cress) 5/05/00 5/9/95 5/24/95
Chelone sp.? (turtlehead)?
Claytonia virginica (spring beauty) 5/05/00 5/9/95 5/16/95
Duchesnea indica (Indian strawberry) 5/06/00
Epifagus virginiana (beech drops)
Erythronium americanum (trout lily)
Galium aparine (cleavers bedstraw)
Geranium maculatum (wild geranium) 5/16/95 5/24/95 5/31/95
Hesperis matrionalis (dame's rocket) 5/31/95 6/2/94
Impatiens capensis (orange jewelweed)
Iris sp. (blue or yellow flag)
Ludwigia palustris (marsh purslane)
Lycopus sp. (water horehound)
Maianthemum canadense (Canada mayflower) 5/16/95
Panax trifolius (dwarf ginseng) 5/9/95
Pilea pumila (clearweed)
Podophyllum peltatum (may apple) 5/24/95
Polygonum arifolium (halberd leaved tearthumb)
Polygonum virginianum (Virginia knotweed)
Potentilla canadensis (dwarf cinquefoil) 5/31/95
Potentilla simplex (common cinquefoil) 5/24/95
Ranunculus abortivus (kidney-leaf crowfoot) 5/05/00 5/9/95 5/16/95
Ranunculus hispidus v. nitidus (swamp buttercup) 5/9/95 5/31/95
Ranunculus recurvatus (hooked crowfoot) 5/06/00 5/16/95
Rorippa nasturtium-aquaticum (watercress) 5/9/95
Sium suave (water parsnip)
Smilacina racemosa (false Solomon's seal)
Symplocarpus foetidus (skunk cabbage) hoods 4/29/93
Taraxacum officinale (dandelion) 5/05/00 5/9/95 5/16/95
Thalictrum pubescens (tall meadow rue)
Trillium erectum (red trillium)
Urtica sp. (stinging nettle)
Veratrum viride (swamp hellebore)
Veronica officinalis (common speedwell)
Viola cucullata (marsh blue violet) 5/05/00 5/16/95 5/24/95
Viola sororia (common blue violet) 5/05/00 5/9/95 5/16/95 5/24/95

Rushes and Sedges:
Luzula multiflora (wood rush) 5/05/00 5/9/95

Anthoxanthum odoratum (sweet vernal grass) 5/16/95
Glyceria sp. (grass)
Phragmites australis (giant reed grass)

Ferns and Fern Allies:
Dennstaedtia punctilobula (hay-scented fern)
Dryopteris marginalis (marginal woodfern)
Equisetum arvense (field horsetail)
Onoclea sensibilis (sensitive fern)
Osmunda cinnamomea (cinnamon fern)
Osmunda claytoniana (interrupted fern) 5/9/95 5/16/95
Osmunda regalis (royal fern)
Polystichum acrostichoides (Christmas fern)
Thelypteris noveboracensis (New York fern)
Thelypteris palustris (marsh fern)

At the Arboretum:
American holly
dawn redwood
European larch
Norway spruce
bull thistle

Date: April 30, 1967
Leader: Warren Balgooyen

A group of fourteen visited the new Gedney Brook Sanctuary of the Saw Mill River Audubon Society for birds and spring flowers. While there was a general absence of birds, a profusion of spring flowers more than made up for the deficit.

Asarum canadense (wild ginger)
Caltha palustris (marsh marigold)
Claytonia virginica (spring beauty)
Dicentra cucullaria (Dutchmen's breeches)
Erythronium americanum (trout lily)
Panax trifolius (dwarf ginseng)
Sanguinaria canadensis (bloodroot)

Note: the new Gedney Brook Santuary, which became Pruyn Sanctuary.