Mysterious Maples

As you walk around the Whiteknights campus you can find at least twenty two species of maples, in the genus Acer (family Sapindaceae). They can be identified by their helicopter-like fruits, opposite branching, and mostly 5-lobed palmately veined leaves (Photos 1-3).

Helicopter-like Maple samaras

There are close to 200 Acer species known to botanists, so figuring out which one you are looking at can be a bit tricky, but once you learn the basic pattern you will be able to identify the genus.

Acer seeds are called samaras.  They twirl like helicopters as they fall from the tree.  The angle between the pair of seeds can also help you to identify the different species.

There are three species of Acer referenced in the most recent survey of the plants of Whiteknights campus (Photos 4-6). Acer campestre, the field maple,  is the only native British maple.

Acer platanoides, the Norway maple and Acer pseudoplatanus, the Sycamore are naturalised, which means they have adapted to living here and can reproduce freely.  They can be found both growing in the Wilderness among deciduous trees and shrubs and planted singly or in borders around the campus.

The other maples in the photo gallery have been planted on campus. The maples in photos 7- 11 show the typical 5-lobed leaf shape.  You might not recognise the maples in photos 12-18  because their leaves have different numbers of lobes, but they all have opposite branching and helicopter-like samaras. Once you know what to look for, you will start seeing maples everywhere!

The plants in photos 19 and 20 are maple impostors! Their leaves are similar to maples, but theyhave alternate branching and their fruits are differently shaped.

Photos and text may be used for non-commercial purposes.

Bibliography

Aas, G. and Riedmiller, A., 1994. Trees of Britain and Europe. London: Harper Collins Publishers.

Le Grice, D. and Jury, S.L., 2011. Flora of Whiteknights Park: A survey of the plants of the University of Reading Whiteknights Campus. Unpublished, University of Reading.

Sheridan Lawn and Landscaping L.L.C., 2012. Tree Species of the Acer Genus. [Online] Available at: http://www.treenames.net/ti/acer/acer.html. [Accessed 27 October 2012].

Stace, C., 2010. New Flora of the British Isles, 3rd edition. Cambridge: Cambridge University Press.

Sterry, P., 2007. Collins Complete British Trees. London: Harper Collins Publishers.

About Lisa Malter

Lisa Malter is a student in the Species Identification and Survey Skills MSc programme.
This entry was posted in Flowering Plants, Plants, Sapindaceae and tagged , , . Bookmark the permalink.

2 Responses to Mysterious Maples

  1. An epic blog – good work! I’d like to see the last few campus maple species added over the summer perhaps – and how about a blog on winter twig ID for Maples?

  2. Pingback: Dr M’s Autumn Term botany class #1: Apps and keys to trees and shrubs | Dr M Goes Wild

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.