Maple trees run
deep in our consciousness. These
magnificent trees grace the national flag of Canada, give us maple syrup and
even give us some of the bats in Major League Baseball.
Maples are classified in the genus Acer
and most are found in the Northern Hemisphere from Asia through Europe to
North America. All maples have opposite leaves (two leaves come out at a node)
and the leaves are lobed, or in a couple of species compound. In the fall of the year, maple leaves turn
red or orange or yellow and generally put on a spectacular show. Another characteristic of maples is their
winged seeds that fly like helicopters to disperse the plant. There are more than 120 Acer species worldwide. Asia
has the highest diversity of maples but there are about a dozen species in
North America.
The winged fruits, the samaras, of Red Maple (Acer rubrum) |
Acer rubrum, the Red Maple is perhaps the
most common deciduous tree in North America.
It grows from the Canadian Maritimes, west to the Great Lakes, South to
Texas and down the length of the Florida peninsula. Red maple’s great range is due to its
adaptability. This tree can grow in poor
rocky soil or with its feet wet in a river bottom swamp. Red Maple thrives in rich, slightly acidic,
soil and can grow to a height of more than 100 feet. Red maple reproduces in late winter when it
puts out small red flowers. Each tree bears separate male and female
flowers. The petals of maples are
tiny because they are not trying to attract insects but are wind pollinated. The female flowers produce winged fruits, the
samaras. Red Maples usually make a pair
of samaras per flower and these are bright red.
The fruits mature and fly from the tree during the summer.
Early spring male flowers of Red Maple. These flowers have highly reduced petals and five stamens. |
Female flowers of Red Maple. Each has two stigmas extending from the top that accept pollen . |
Female flowers of Red Maple with young developing fruits. |
Red Maple with maturing samaras. They will turn red in a few days. |
A large group of Red Maple fruits beginning to turn red. |
Sugar Maple
(Acer saccharum) has a more northerly
distribution than Red Maple. It was
originally absent from the Southeastern United States but is now widely grown
as an ornamental tree. Sugar
Maple’s claim to fame is as the source of maple syrup. In late winter, the tree begins to mobilize
sugars that were stored in the roots and transports them to the shoots. There the sugar is used to power the
growth of the new leaves. For the last
couple of winters students and professors at Catawba College in Salisbury, NC,
have been tapping maples on campus and making their own syrup. These
sugarers inserted taps into the sapwood of the tree, collected the sap and boiled
it to make the syrup. North Carolina is
not the best place for a maple syrup operation but these students and
professors collected 20 gallons of sap and made a half gallon of syrup.
Fall leaves of Sugar Maple (Acer saccharum). |
A Catawba College student using a drill to tap a Sugar Maple tree. Photo courtesy of Dr. Jay Bolin. |
Sap dripping from a tap in a Sugar Maple tree.
Video courtesy of Dr. Jay Bolin.
A Catawba College student sampling maple syrup. Photo courtesy of Dr. Jay Bolin. |
Maples offer
delight throughout the year. They signal
the end of winter with their red flowers.
They enchant with helicoptering fruit. And in the fall, they dazzle with
their brightly colored leaves. Enjoy.