Something About Maples

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.