Questions tagged [trees]
Common classification for perennial plants with woody, elongated stems.
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What is this plant with yellow large fruit?
Found this in a garden in San Francisco. Can't decide if it's pomelo, capri lemon or something else, ideas?
4
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0answers
69 views
Tree identification in the Caribbean
I live in Puerto Rico and I'm trying to identify this tree and if possible how to kill it since it is infested with termites.
https://imgur.com/gallery/Xbmq0g8
Tree
Closer view of flowers and leaves. ...
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0answers
41 views
Evolution at a glacial pace: how does it work? [duplicate]
Some trees are very long-lived, such as the Great Basin Bristlecone Pine and the Giant Sequoia (up to 4,800 years old).
How does natural selection and evolution affect such long-lived organisms? ...
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1answer
64 views
Does anybody know what kind of tree is this?
I saw this tree yesterday and I liked it. It is around 1.5 m. I did some search on internet and thought it might be Holly, but I'm not an expert on trees. So I wanted to ask you, does anyone know what ...
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1answer
47 views
Why do trees prefer their sunlight a bit diffused?
I don't know what "a bit diffused" here means.
Do other plants also "prefer their sunlight a bit diffused"?
Mount Pinatubo was the most powerful volcanic eruption in nearly ...
3
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1answer
49 views
Tree identification
I went to Araku few days ago and saw this tree in a garden .
Here are the leaves
I know the pic of fruits is a bit hazy and out of focus,but it's the best I have.
These trees were in a cluster ,...
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54 views
Function of the 'double' leaf on a pomelo tree
What is the function of the 'double leaf' (I'm unsure what the technical name is...) on a pomelo tree leaf?
Furthermore, what evolutionary 'problem' is this structure solving?
See image with arrows ...
3
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1answer
32 views
How is silica transported to the leaves of genus Dendrocnide trees to form stinging needles for toxin delivery?
I just read the NYTimes' This Tree’s Leaves Look Soft and Inviting. Please Don’t Touch Them. which mentions the genus Dendrocnide and that Wikipedia section begins with:
Contact with the leaves or ...
3
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1answer
89 views
What's the name of this green fruit with little pikes fallen from a city tree on the pavement?
What's the name of this green fruit with little pikes fallen from a tree on Paris (France) pavement ?
7
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1answer
85 views
What is the fate of the typical tree?
Walking through the local established broadleaf forests dominated by oak and tulip poplar (Eastern U.S.), it is common to find patches of young tree saplings, say 10-20 oak or tulip poplar saplings ...
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0answers
32 views
Tree with red samaras
This tree has red samaras.
Location: Toronto
Size: medium-sized tree
Date: July 26th, 2020
What is it?
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1answer
37 views
Tree Identification - California Bay Area
I've seen these trees in the Bay Area in Mountain View and Fremont, and have been searching for different pine tree varieties that have wider canopies. Does anyone here know what trees these are, they ...
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Tree-pest coevolution
Many trees first reproduce decades after germination. Many pests of trees reproduce in under a year. It would seem that the pests have an advantage in the evolutionary arms-race, as they can evolve ...
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1answer
41 views
What causes the yellow and brown spots on our sour cherry tree?
So at the end of spring (maybe at the beginning of summer) our sour cherry tree started producing these yellowish/brownish spots on its leaves. Can you help me identify the couse of this? What can we ...
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0answers
11 views
What are the differences between how latewood and earlywood forms and how does this effect it's properties?
In trees the earlywood forms a somewhat abrupt transitions to the darker latewoods that happen during the summer months.
What are the chemical differences that arise in this wood at the cellular and ...
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1answer
120 views
How are large snails able to climb trees?
In answers to What kind of hot pink eggs are these? and the linked duplicate I found out that snails that live in the water will climb up a smooth stick or branch to deposit their eggs. Today I saw ...
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0answers
39 views
Identification and odd leaf anomaly
We're in the process of welcoming sheep, thus setting up the fences, now inside on of the areas, there is a small tree. Never seen leafs like this before. I suspect this to be some sort of anomaly/...
2
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1answer
25 views
Carotene in Dracaena draco
I'll keep this question straight and simple:
Some succulent plants produce carotene, a red pigment, in response to great heat, turning their leaves red. The dragon blood tree (Dracaena draco) is ...
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0answers
21 views
What is happening to this linden tree? [duplicate]
The main tree is a linden tree judging by the flowers in the spring. And the bottom bush thing is a lilac. Is the lilac somehow attacking the tree?
6
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1answer
269 views
Trees growing around objects vs pushing them away. Where is the threshold?
If a tree grows against a taut wire then the tree will grow around it, eventually enveloping the entire wire. This often scars the tree, and if the wire is thick enough, it will interrupt nutrient ...
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1answer
46 views
How do tree gnarls develop?
What causes the trees to develop gnarls? I can't find anything on internet other than dictionary definitions.
Are they caused by a mold, like the burls?
4
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0answers
114 views
Why do quaking aspens quake?
I've just finished reading The Hidden Lives of Trees by Peter Wohlleben, which I thoroughly enjoyed.
According to the author, the advantage of shaking the leaves is that both sides of the leaf are ...
0
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2answers
99 views
How do bees help flowering trees survive?
I have often heard a vague claim that bees help flowering tree populations survive.
As far as I know, bees take nectar and pollen concentrations from the flowers of flowering trees and use at least ...
6
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1answer
168 views
Identify this tree?
I found this tree in Crete, Greece close to the sea, planted next to a building. Since I haven't seen this tree anywhere else in the island, I suppose it was planted by someone. Here are some pictures ...
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1answer
118 views
Does the 'President' have 2 Billion Leaves?
The world's second-largest known tree, the President, in Sequoia National Park is 3200 years old and is said to have 2 billion leaves (Source: https://youtu.be/vNCH6uhB_Bs?t=59).
Is this correct? And ...
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1answer
78 views
What is the etymology for Pinus halepensis?
I have a problem of figuring out the etymology of Pinus halepnesis.
An etymonline search with halepensis brought no result.
It is unclear to me from the English wikipedia article and from the ...
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2answers
102 views
Are there organisms that “branch more” near the leaf?
(I'm a computer scientist)
Tree branching is a fractal patterns in nature. I know stems typically branch in two at each level (self-similarity). I guess there are plants or other organisms that ...
2
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0answers
49 views
Folded stem on apples - does it have a name?
I have some Newton Wonder apple trees. One feature of the apples it bears is that the flesh around the stalk is occasionally elongated out of the calyx. Below is a picture that shows this on the near ...
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0answers
33 views
Spatial sequence of autumn leave colouring: top to bottom
Leave colours on trees seem to vary on the same tree from top to bottom. Leaves higher up are already further ahead in the shedding process. What's the reason for this tempero-spatial gradient?
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4answers
151 views
Is it true to say that the genome of trees includes or at least “encapsulates” the genome of mushrooms?
As a botany amateur, I know that mushrooms (which are of course studied in field of mycology and not botany) are dependent in trees or shrubs (and maybe also bushes) and that there are generally ...
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0answers
35 views
How many plants or trees should one plant to take carbon dioxide from atmosphere?
I'm interested on computing things. I know that some biologists have done mathematical modelling. Has anyone took any calculations on the following?
How many trees or plants should one plant such ...
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0answers
38 views
Are there any evolutionary reasons for the different tree shapes? If so, What are they?
So we know there are a thousand types of trees with different shapes.
We have Columnar shaped trees:
Pyramidal or Conical shaped trees:
Weeping shaped trees:
And we also have Round, Vased, Open-...
5
votes
1answer
118 views
Leaf formation on unknown tree: cocoon or something else?
A small tree in my yard has leaves which appears to double over themselves. The first two pictures show this phenomena, and the third is the same tree to maybe aid identification.
I can't absolutely ...
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0answers
21 views
What is the total mass of leaves on an 'average' mid-latitude deciduous tree?
I know that this is a broad question as there are a very large number of different species of tree with all manner of profiles, height, leaf sizes, etc. My ultimate goal is to estimate the total mass ...
5
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2answers
204 views
Why does this plum/apricot hybrid look like brains?
Why does this plum/apricot hybrid look like brains?
Notes:
Here's a photo of what a normal fruit on the tree looks like.
Location is Zone 5, east of Toronto.
There are about 20 other fruits on the ...
-1
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1answer
31 views
Long brown needly things fallen from tree?
I was walking next to a row of trees (I think coniferous) and found many of these things on the ground:
A parallel bundle of 2-4 medium-brown needly things, about 15 cm long and 1 mm in diameter, not ...
4
votes
1answer
68 views
Is it unusual for populations of archaea to be found living inside trees?
The NPR News article and podcast Getting Fire From A Tree Without Burning The Wood begins with
A scientist walks up to a cottonwood tree, sticks a hollow tube in the middle and then takes a lighter ...
81
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2answers
8k views
What's up with this leaf?
This cool design was "tattooed" on this leaf.
I found it on the windshield of my car.
What's up with it?
5
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2answers
147 views
Do trees in a forest generally grow in a lattice formation?
The closest arrangement of trees in which they are at least a certain distance away from each other is a triangular lattice, much like a honeycomb. I wonder if you tend to see this sort of arrangement ...
2
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1answer
81 views
What is this tree growing in my town?
Can anyone tell me what kind of tree this is? I took this picture today. It's in Iowa City, Iowa.
2
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4answers
294 views
How many nutrients do trees process daily?
Is this tree fact below that I have found on social media sites true? I don't know the source of the quote. It's pretty amazing. I'll be glad if someone can provide the source too!
Natural Wonders
...
3
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1answer
73 views
What species of tree is this (found in Navarre, Spain, many tiny flowers)?
It was planted within the urban area of Pamplona, Navarre, in Spain. It does not seem like it's native to the area, since no trees like it are found in nearby forests. Its size is of 7-9 meters, while ...
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0answers
23 views
Near-zero water loss in a closed hydroponics system?
I know there are a lot of factors that would impact this...
Plant type.
Plant neediness (i.e., even sibling plants will possess different needs, defects, etc).
Automation efficiency.
Water & ...
2
votes
1answer
120 views
What plant have I collected?
I have collected this plant from the soil in a park in Belgium. I thought it was a child of a plant which was growing nearby but when the leaves started to grow I realised it is a different plant.
...
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0answers
40 views
Winter is getting shorter and warmer. Does this mean deciduous trees can photosynthesise for longer and thus absorb more carbon dioxide?
As springtime is starting earlier this year, I wondered if that would mean deciduous trees had more time to photosynthesise and, therefore, they could absorb more CO2 or have longer periods to grow, ...
10
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2answers
225 views
Is the chemical composition of urine detrimental or beneficial for a tree?
Seeing as a lot of people around the world urinate against trees it came to mind that I never thought about how the tree responds to this.
Is it detrimental for a tree if people urinate against them?
...
6
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1answer
115 views
Branch taking over a tree trunk
I stumbled upon a birch growing in sandy soil in a coniferous forest in central Russia.
It looks like over time the tree trunk got bent towards the trail and one of the branches became the new trunk ...
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1answer
130 views
Is it possible to estimate tree height from stump/breast diameter and species?
Kindly pardon my poor knowledge, my area of expertise is not biology.
I am currently working on project where I have access to tree's stump and breast diameter and its species. We are trying to ...
4
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1answer
317 views
Fruit identification - What is this green long fruit?
I found this fruit in the South of France, but I have no Idea what it is. It's a green, hard fruit. I tried to cut it to see the inside (on the following pictures).
It fell from a big tree, but I don'...
4
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1answer
83 views
Can someone help me to identify what kind of pear is this?
I went to my local groceries supermarket (in Lima, Peru) and found this cheerful looking pear named locally as "pera canela". But I found it weird as the only variety which I'm aware of is Packham's ...
