Jack Dykinga / Yucca (Yucca schottii) plants growing amongst Bigtooth maple trees (Acer saccharum grandidentatum) in autumn, Huachuca Mountains, Coronado National Forest, Arizona, USA

Jack Dykinga / Leaves of Arizona sycamore (Platanus Wrightii) and Bigtooth maple (Acer saccharum grandidentatum) floating on water, South Fork Cave Creek, Coronado National Forest, Chiricahua Wilderness, Chiricahua...

Jack Dykinga / Blue Hen Falls with Sugar Maples (Acer saccharum) and American Beech trees (Fagus grandifolia), Cuyahoga Valley National Park, Ohio

Jack Dykinga / Autumnal Bigtooth Maples (Acer saccharum grandidentatum), West Fork Oak Creek, Coconino National Forest, Arizona

Jack Dykinga / Red and Yellow coloured Bigtooth Maples (Acer saccharum grandidentatum) in Autumn, West Fork Oak Creek, Coconino National Forest, Arizona

Jeff Foott / Sugar Maple (Acer saccharum) trees in autumn, Acadia National Park, Maine

Jeff Foott / Sugar Maple (Acer saccharum) trees in autumn, Acadia National Park, Maine

Jeff Foott / Sugar Maple (Acer saccharum) in autumn, Acadia National Park, Maine

Scott Leslie / Sugar Maple (Acer saccharum) trees in autumn, Mount Carleton Provincial Park, New Brunswick, Canada

Scott Leslie / Sugar Maple (Acer saccharum) old-growth grove, Cape Breton Highlands National Park, Nova Scotia, Canada

Jack Dykinga / Autumnal landscape with Sugar maple (Acer saccharum) and American beech (Fagus grandifolia) forest, and Blue Hen Falls, Cuyahoga Valley National Park, Ohio, USA, October 2006.

Duncan Usher / Sugar Maple (Acer saccharum) leaf on snow-covered ground, Germany

Doug Wechsler / Close-up of a Sugar maple leaf (Acer saccharinum), Pennsylvania, USA, October.

Scott Leslie / Sugar Maple (Acer saccharum) seedling growing beneath old-growth Canadian Hemlock (Tsuga canadensis), Nova Scotia, Canada

Matthias Breiter / Sugar Maple (Acer saccharum) seed pods, Spruce Woods Provincial Park, Manitoba, Canada

Rolf Nussbaumer / Bigtooth Maple (Acer saccharum grandidentatum) shifting into autumn colours. Lost Maples State Park, Hill Country, Central Texas, USA, November.

LYNN M. STONE / Sugar Maple Leaves (Acer saccharum) in water, Connecticut, USA

Doug Wechsler / Old growth Sugar maple (Acer saccharim) trees, Nova Scotia, Canada, August

Jerry Monkman / Sap buckets attached to the trunks of Sugar maple trees (Acer saccharum) to collect the maple sap, stone wall, Lyme, New Hampshire, USA, March 2007

Scott Leslie / Sugar Maple (Acer saccharum) forest and trail, Cape Breton Highlands National Park, Nova Scotia, Canada

Scott Leslie / Paper Birch (Betula papyrifera) and Sugar Maple (Acer saccharum) saplings, Cape Breton Highlands National Park, Nova Scotia, Canada

Philippe Clement / Sugar maple (Acer saccharum) leaf in autumn colours, native to North America

Jerry Monkman / Sap buckets on trunk of Sugar maple tree {Acer saccharum} Barrington, New Hampshire, USA. The Sugar Shack, manufacture of maple syrup.

Jerry Monkman / Fallen leaves of the Sugar Maple {Acer saccharum} tree in autumn, New Hampshire, USA

Jerry Monkman / Leaves of the Sugar Maple {Acer saccharum} tree in autumn, Greenville, Maine, USA

Thomas Lazar / Upland Sugar Maple (Acer saccharum) forest in autumn, Porcupine Mountains State Park, Upper Peninsula, Michigan, USA

Thomas Lazar / Rain drops on fallen Sugar Maple Leaves (Acer saccharum) in autumn, Michigan, USA

Thomas Lazar / Sugar Maple (Acer saccharum) and Pine trees in autumn, Porcupine Mountains State Park, Upper Peninsula, Michigan, USA

Jack Dykinga / Sugar Maple (Acer saccharum) and American Beech leaves (Fagus grandifolia) on a small waterfall above Blue Hen Falls in Cuyahoga Valley National Park, Ohio

Jack Dykinga / Sugar Maple (Acer saccharum) and American Beech leaves (Fagus grandifolia) on a small waterfall above Blue Hen Falls in Cuyahoga Valley National Park, Ohio

Larry Michael / Sugar maple tree {Acer saccharum}canopy leaves in autumn, USA

Rolf Nussbaumer / Bigtooth Maples (Acer saccharum grandidentatum) in autumn, McKittrick Canyon, Guadalupe Mountains National Park, Texas, USA, November 2005

LYNN M. STONE / Sugar maple tree with leaves turning colour, Autumn, {Acer saccharum} Vermont, USA

Larry Michael / Avenue of Sugar maples in autumn {Acer saccharum} Wisconsin, USA

Larry Michael / Avenue of Sugar maple trees in autumn {Acer saccharum} Wisconsin, USA

Larry Michael / Sugar maple tree branchess and leaves {Acer saccharum} Michigan, USA

Larry Michael / Sugar maple avenue in autumn {Acer saccharum} Wisconsin

George McCarthy / Crimson coloured leaves of Sugar Maple (Acer saccharum) Autumn, Wyoming, USA

George McCarthy / Orange coloured leaves of a Sugar Maple (Acer saccharum) in Autumn, Wyoming, USA

Jack Dykinga / Bigtooth maple {Acer saccharum grandidentatum} trees in autumn colours, Huachuca mountains, Coronado National Forest, Arizona, USA

Jack Dykinga / Sugar maple {Acer saccharum}, American beech {Fagus grandifolia} and Yellow birch {Betula alleghaniensis} trees turning colour in autumn, Green Mountain National Forest, Vermont, USA

Larry Michael / Aeriel view of river in Sugar maple forest {Acer saccharum} Michigan, USA

Chris O'Reilly / Close up of leaf of Sugar maple {Acer saccharum} showing colour change in autumn, Derbyshire, UK

Yva Momatiuk & John Eastcott / Sugar Maple (Acer saccharum) grove in autumn, Montgomery Place Historical Park, New York

Yva Momatiuk & John Eastcott / Sugar Maple (Acer saccharum) leaf, close up of groups of cells turning red in autumn, Hudson River Valley, New York

Yva Momatiuk & John Eastcott / Sugar Maple (Acer saccharum) leaves, close up of groups of cells changing color in autumn, Hurley, New York

Yva Momatiuk & John Eastcott / Sugar Maple (Acer saccharum) and Beech leaves in autumn color, Baxter State Park, Maine

Jim Brandenburg / Sugar Maple (Acer saccharum) trees in autumn colors, Vermilion Falls, Voyager National Park, Minnesota

Larry Michael / Sugar maple leaf (Acer saccharum) on ground. USA

Larry Michael / Autumn Sugar maple leaf on ground with lichen, North America

Larry Michael / Sugar maple leaf (Acer saccharum) on ground. USA

Larry Michael / Sugar maple (Acer saccharum) in autumn colours. USA

Larry Michael / Sugar Maple (Acer saccharum) in autumn colours. USA

Larry Michael / Sugar maple (Acer saccharum) in autumn. Michigan, USA

Yva Momatiuk & John Eastcott / Sugar Maple (Acer saccharum) tree with snow, Hurley, New York

Jeff Foott / Sugar Maple (Acer saccharum) leaves in autumn, Acadia National Park, Maine

Jeff Foott / Sugar Maple (Acer saccharum) leaves in autumn, Acadia National Park, Maine

Sebastian Kennerknecht / Sugar Maple (Acer saccharum) tree in autumn, Williamstown, Berkshires, Massachusetts

Sebastian Kennerknecht / Sugar Maple (Acer saccharum) trees in northern hardwood forest in autumn, Williamstown, Berkshires, Massachusetts

Sebastian Kennerknecht / Sugar Maple (Acer saccharum) trees in northern hardwood forest in autumn, Williamstown, Berkshires, Massachusetts

Sebastian Kennerknecht / Yellow Birch (Betula alleghaniensis) and Sugar Maple (Acer saccharum) trees in northern hardwood forest in autumn, Williamstown, Berkshires, Massachusetts

Sebastian Kennerknecht / Sugar Maple (Acer saccharum) trees in northern hardwood forest in autumn, Williamstown, Berkshires, Massachusetts

Sebastian Kennerknecht / Yellow Birch (Betula alleghaniensis) and Sugar Maple (Acer saccharum) trees in northern hardwood forest in autumn, Williamstown, Berkshires, Massachusetts

Scott Leslie / Sugar Maple (Acer saccharum) forest, Cape Breton Island, Nova Scotia, Canada

John Shaw / Yellow sugar maple tree (Acer saccharum) and red maple tree (Acer rubrum) in autumn colour. Nicolet National Forest, Wisconsin, USA. October.