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Identifying Eucalyptus Trees

Trees

11 Mar

Identifying eucalyptus trees is a challenge as it’s such a diverse group of hardwood trees with over 900 native species. Eucalypts form an essential ecosystem for many iconic Australian animals, and identifying them enhances our ability to understand the habitat it provides and enables us to manage and conserve this resource well.

Identifying Eucalypts is a complex process and goes beyond the scope of this article, but we will investigate a few main characteristics that will encourage an appreciation and wonder for this iconic tree species that is found North to South, and East to West.

Listen to this inspiring story of how every Eucalyptus species came to be planted in one arboretum.

Table of Contents

  • Climate, Region and Landform
  • Soil Type
  • Tree Height
  • Tree Habit
  • Bark Type
    • Bark Characteristics
    • Bark Colours
  • Leaf Type
  • Bud type
    • Bud Shape
    • Bud Texture
  • Flower Colour
  • Fruit
  • Seeds
  • Field Notebooking
  • WOULD YOU LIKE TO LEARN MORE ABOUT EUCALYPTUS TREES?
    • Investigate gum trees in the Backyard Nature Study Guide | Summer / Autumn | Volume 5.
  • YOU MAY BE INTERESTED IN:
    • Counting Spots | Lady Beetles
    • Grasshoppers
  • EARN YOUR NATURE CLUB BADGES WHILE EXPLORING TREES BY BEING AN INSECT OBSERVER.
    • P.S.  Nature Science for Aussie families is an F.B. Group where outdoor mamas share their adventures, explorations, and activities to motivate, encourage and support one another. We’d love to have you come alongside us and share in our joy.  
    • P.S.S. Nature Science for Aussie Families is now on MeWe. Connect with us!

Climate, Region and Landform

Before we begin to identify any tree, we need to consider where we are, the climate, and the landforms where the tree is found. This information will narrow down our search dramatically.

Four questions to ask are:

  • In which state am I?
  • What region is the tree growing in?
  • What is the climate here?
  • What landform surrounds the tree? Is it by coastal plains, inland plains, mountains, hills, ridges, valleys, riverbanks, or floodplains?

Soil Type

Examine and identify the type of soil the tree is growing in, then confirm your hypothesis by researching the region’s soil type.

Tree Height

One main characteristic we need to find out is, how tall is the tree? Use your math skills to estimate how tall it is and then confirm its height by measuring it. Some trees are so tall, it’s impossible to climb and measure them, so here is one technique you can use to include this information in your identification process.

Tree Habit

Eucalypt trees grow in two habit forms:

  • In the first habit form, the tree grows straight up with one trunk.
  • In the second habit form, the tree grows as a mallee or shrub with multiple trunks, and it’s usually less than 10m tall.

Bark Type

Many Eucalyptus trees are named according to their bark types like the Iron Bark or Stringy Bark species. The type of bark is an important characteristic to consider for correct identification.

Bark Characteristics

Some bark characteristics to examine are:

  • Wholly smooth bark refers to trunks that are completely shed annually exposing a smooth surface of fresh bark.
  • Partly rough trunks are partially shed each year. In this state, the bottom of the trunk will be rough while the top will show signs of new, shiny bark.
  • Wholly rough bark refers to trunks retaining their bark year round resulting in a hard, rough surface.
  • Some eucalyptus trees shed their bark in a ribbon formation in the upper branches.
  • Other eucalyptus trees may include ‘scribbles’ on smooth bark created by insect larvae.
  • Note that the bark on branches can differ from trunk bark.

Bark Colours

Once old bark is shed on smooth trunks, a new, shiny surface is revealed from shades of snow, winter, rose, sunset, olive, and copper. Bark colour on smooth trunks can be white, cream, grey, brown, green, yellow, orange, copper, and pink.

Colours on hard, rough trunks include white, grey, brown, black, red, pink, yellow, and orange.

Leaf Type

There are many, complex leaf characteristics to consider when identifying eucalyptus trees, but we will investigate a few main components like:

  • the leaf position on the branches that are either opposite or alternate to each other.
  • the leaf blade shape.
  • the leaf blade length that is measured from the leaf’s apex to its petiole.
  • the leaf blade width that is measured at its widest part.
  • the shape of the leaf base.
  • the shape of the leaf apex.
  • the shape of the leaf margin.
  • the sheen on the top of the leaf that can be either glossy or dull.
  • the leaf colour which can be green or olive-green or blue-green, grey-green and blue-grey.

Use this link to Botany | Leaf Terminology to help identify leaf characteristics.

Bud type

Bud Shape

Buds are unopened flowers, and they usually hang in clusters at the end of a stalk. Buds are formed in a variety of shapes and sizes. Some bud shapes include club-shaped, oblong, ovoid, diamond-shaped, pear-shaped, sphere, square, and mushroom-shaped.

Bud Texture

Bud textures can be smooth, warty or bumpy, scaly or scurfy and hairy.

Flower Colour

The anther stalks of the stamens are responsible for the colour of the flowers that come in shades of white, cream, yellow, lemon, red, and pink.

Fruit

The fruit of the eucalyptus tree is commonly known as the gum nut, but they are actually dry, woody capsules with compartments that contain seeds. The fruit comes in a variety of forms like cups, urns, barrels, and bells.

Seeds

Eucalypt seeds are tiny, only 3 mm long and they can be black, brown, grey, red, or yellow. Seed shapes are either saucer-shaped, pyramidal, boat-shaped, D-shaped, or ovoid.

Field Notebooking

Now that you know a little about identifying Eucalypts, download your notebook pages, step into the field and begin to enjoy the excitement of classifying this diverse group of native trees.

Eucalyptus-Notebook-PagesDownload

WOULD YOU LIKE TO LEARN MORE ABOUT EUCALYPTUS TREES?

Investigate gum trees in the Backyard Nature Study Guide | Summer / Autumn | Volume 5.

YOU MAY BE INTERESTED IN:

Counting Spots | Lady Beetles

Grasshoppers

AUSTRALIAN NATIVE TREE IDENTIFICATION CARDS
Are you familiar with Australian Native Trees? If you’d like to improve your identification skills in this area, then the Australian Native Tree Identification Cards will encourage further investigation. Trees will be recognized by their habitual form, leaves, and flowers as they become old friends.’

EARN YOUR NATURE CLUB BADGES WHILE EXPLORING TREES BY BEING AN INSECT OBSERVER.

P.S.  Nature Science for Aussie families is an F.B. Group where outdoor mamas share their adventures, explorations, and activities to motivate, encourage and support one another. We’d love to have you come alongside us and share in our joy.  

P.S.S. Nature Science for Aussie Families is now on MeWe. Connect with us!

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About Marie

Homeschooling is a gentle amble for me since four of my five children have graduated. I share my joy with things beautiful, good and lovely with my grandchildren where I live contently with hubby in rural South Australia.

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I totally enjoy using the Nature study guide. The children enjoy learning about the different animals and plants.
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I looked high and low online for an Australian nature based curriculum and when I found Australian Nature study Guide on Instagram I was so excited to have finally found something that my family can relate to. My favourite thing about this guide is that Marie is so hands on and involved with her customers. I have never felt alone in the journey, she is there to guide and encourage us every step of the way in the Facebook group. Thanks Marie for welcoming us to your nature study family 🙂
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We didn’t find out about the program until about half way through term, so we played catch up most of the time. I love how open ended the lessons are, but with enough structure to work well for those children needing such a program. We have been able to cover much of the required curriculum whilst enjoying the activities we love. Your program has been such a blessing to us, because we needed a change to our homeschooling lessons which would still cover curriculum, but would enable us to relax and enjoy “school” together. Thank you.
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We began our homeschool journey this year keen to explore all that nature study entails. I had searched the web for weeks to research what we would use as our framework. I cannot describe the elation I felt when I came across an AUSTRALIAN nature study guide! Marie has done all the hard work and put together a wonderfully elaborate resource for all ages. You can dip your toe in or dive right into all the ideas and links. There’s so much here we could spend all week doing nature study, and often we do.
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We began our homeschool journey this year keen to explore all that nature study entails. I had searched the web for weeks to research what we would use as our framework. I cannot describe the elation I felt when I came across an AUSTRALIAN nature study guide! Marie has done all the hard work and put together a wonderfully elaborate resource for all ages. You can dip your toe in or dive right into all the ideas and links. There’s so much here we could spend all week doing nature study, and often we do.
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We have really enjoyed the program this term. We have gotten outside more often and the children are definitely taking more notice of things when we are out. Having a place to share what we have done and seen has been an encouragement to keep it up. I sometimes felt like we could spend longer on some topics as they were so interesting but that is probably just my obsessive "we must cover everything now" problem. 
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