Questions tagged [trees]

Common classification for perennial plants with woody, elongated stems.

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Urushiol sensitivity in trees

I have seen a bumpy, rash-like occurence, similar to the rash in humans, on many trees overgrown with poison ivy. I have read that poison ivy gall mites cause a red rash on the leaves of poison ivy ...
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Could water soluble dyes be directly absorbed by a plant's / tree's xylem?

Amateur woodworker / hobbyist here, I enjoy using colorful or exotic wood species, the issue is that many of these species are rare, expensive, endangered, hard to grow, or otherwise difficult to ...
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4 votes
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Coniferous tree with alternating bunches of short needles (Toronto area)

What species of tree is this? Location: East of Toronto, zone 6; urban Date of photos: May 10, 2022 Diameter at breast height: ~18 inches Height: ~30 ft
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What kind of tree has leaves like this?

Shot taken in Spring, on May 22, 2020 in a forest in Haliburton, Ontario.
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What kind of deciduous tree is this?

This image was captured on October 10th, 2020 in Haliburton, Ontario, Canada. Any help identifying the tree species is greatly appreciated. Rob.
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Were fall foliage leaf colors in Canada also delayed in autumn 2021?

English is not my first language. I didn't fully grok this National Geographic article published November 24 2021 by Sarah Gibbens. But it discusses just the eastern U.S.A., NOT Canada. How ever what ...
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Could a tree grow in a low pressure environment?

Could a tree grow in a low pressure environment? If you had a pressure say, 10% of that of Sea level could a tree grow if it was in the proper soil and watered regularly?
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2 votes
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Identification of tree seed pods observed in Western Australia near the city of Perth in February

These where observed during a holiday in Western Australia near the city of Perth in February 2019. I assume they are tree seed pods. But from which tree?
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How related are trees?

I was surprised to see how far apart macadamia and hazelnuts are from each other. I always thought all trees had a common ancestor that was also a tree. But that doesn't seem to be the case? Did wood ...
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why do some trees have trunks that branch out and others don't?

I've never seen a bald cypress that had a tree fork but oak trees have them all the time. Any ideas as to why this is? Bald Cypresses are usually found in very wet areas whereas oak trees tend to be ...
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Can inosculation occur between different species?

As I learnt, Inosculation occurs between two trees of same species or related species. If I plant a completely different species close to each other, will this phenomenon occur? Will this fuse ...
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Why does this tree have a round hole?

One of my soccer students was hiding behind a tree when he discovered this hole. I've tried Googling it but I couldn't find out why this tree has a hole.
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Where can I find a list of trees in the world? [closed]

I want to make an app for smartphones that list most common trees in the world. Where can I find a list? I would like to include if the tree is deciduous or perennial and geography/climatic location. ...
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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?
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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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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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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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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 ...
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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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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 ...
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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 ...
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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 ?
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7 votes
1 answer
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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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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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1 answer
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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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1 answer
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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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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/...
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2 votes
1 answer
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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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6 votes
1 answer
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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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1 answer
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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?
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4 votes
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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 ...
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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 ...
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6 votes
1 answer
179 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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2 votes
1 answer
131 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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2 votes
1 answer
103 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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0 votes
2 answers
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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 ...
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2 votes
0 answers
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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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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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4 answers
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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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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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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-...
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5 votes
1 answer
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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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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 ...
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5 votes
2 answers
262 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 ...
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-1 votes
1 answer
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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 ...
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4 votes
1 answer
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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 ...
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4 votes
1 answer
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Type of Tree With Somewhat Squarish Fruit

I live in the SF Bay Area and am trying to identify a tree on my street. It's the fruit that is confusing me -- does anyone know what this fruit is? It's not a rare tree -- there are at least several ...
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82 votes
2 answers
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?
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5 votes
2 answers
163 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 ...
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