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Sign: The Hebrew University of Jerusalem - Discovery Tree Walk - Siberian Elm


Address:
Givat Ram, Jerusalem, Israel
Category:
City:
Country:
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Placement:
Tags:
Flora 
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On the sign:
25
אולמוס נמוך
Ulmus pumila


תפוצה טבעית: דרום סיביר, אפגניסטן, אירן

שים לב לשרידי שלושת הענפים הראשיים בעץ זה שגננים גזמו לפני מספר שנים. הגיזום הפסיק את הזרימה מלמעלה של ההורמון אוקסין, שתפקידו לעכב יצירה של ענפים. את התוצאה אנו רואים לפנינו: ענפים דקים עם הנצה פראית בלתי מבוקרת, בשלושת מקומות הגיזום.

[הפאה השנייה של הקוביה]
[The second face of the cube]
25
Siberian Elm
Ulmus pumila


Natural range: S. Siberja, Afghanistan, Iran

Note the three places where gardeners, years ago, cut through this tree’s three main limbs. This interrupted the flow, from above of the sprout-inhibiting hormone, auxin. With this inhibition cut off, note the many branches that sprouted from these cuts.

[הפאה השלישית של הקוביה]
[The third face of the cube]
[שאלה]
האם תוכל לגלות 3 מאפיינים ייחודים בעליו של העץ?

[a question]
Can you find three unusual features of this tree’s leaves?

[הפאה הרביעית של הקוביה]
[The fourth face of the cube]
[התשובה לשאלה]
מאפייני העלים: שולי העלים משוננים; רובם א-סימטריים (אחד הצדדים גדול יותר, בעיקר ליד בסיס העלה); מיקומם על הענף מתחלף לסירוגין. כל מיני האולמוסים הם בעלי שלוש תכונות אלו.

[The Answer to the question]
This tree’s leaves have saw-tooth shaped edges; many are asymmetrical (either left or right side larger, mainly near the leaf base); and their positions on the branch are strictly alternating. All elm species show these three features.
Photography:
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Comments:
Tree No. 25 in the Mac and Tibby Podel Discovery Tree Walk, located on the Edmond J. Safra Campus of the Hebrew University of Givat Ram.

Each tree is accompanied by a cube with details on the tree. On the top of which is the text:
Mac and Tibby Podel Discovery Tree Walk Click for a larger image

In the next picture taken from one of the trees on the route, you can see the way the sign is placed (a cube standing on a metal pillar) and the tree to which it points Click for a larger image

The tree to which the cube points was photographed that day Click for a larger image

And in the next picture you can see the wild sprouting in the pruning places Click for a larger image

The rest of the cube faces:
The second face Click for a larger image
The third face Click for a larger image
The fourth face Click for a larger image




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