Questions tagged [trees]

Common classification for perennial plants with woody, elongated stems.

Filter by
Sorted by
Tagged with
1 vote
0 answers
9 views

Eastern White Pine seed/cone maturity date in Central Ontario

What time of year do Eastern White Pine (Pinus strobus) cones mature in Central Ontario? I plan to drive to that area, specifically Peterborough, to harvest seeds from specific trees (to stratify &...
  • 660
8 votes
1 answer
2k views

How long does DNA last in wood?

I was wondering if it's possible to find out if the wood of the table I bought is from the same tree of the chair in the same set. Most likely not, but I was wondering if it's theoretically possible ...
0 votes
1 answer
43 views

Growing peaches from (supermarket) bought seeds

As a hobby I like to grow stuff from the seeds of fruits (or bascially everything) that I buy in grocery stores. I have heared often that if the trees will eventually grow own fruits, they will not ...
  • 103
-1 votes
1 answer
38 views

Sex in diploid cones in gymnosperms [closed]

Gymnosperms have male and female cones. If the cones are diploid, how can individual cones be male or female?
2 votes
0 answers
56 views

What are the structures that make pixel-like patterns in wood?

Some wood seems to have structures that are squarish in cross-section. I've often noticed that these are distributed in arcs or sinusoid shapes on guitar fretboards, for instance. Here's an example I ...
  • 121
3 votes
1 answer
69 views

What species of poplar tree is this?

I am looking for information on how to identify a poplar (Populus) tree. It is located in Dresden, Germany, next to a small stream. The city tree database lists it as Populus nigra. However, it ...
  • 475
1 vote
1 answer
42 views

How to distinguish hornbeam from hophornbeam?

The town where I live plants both hornbeam trees (Carpinus betulus) and hophornbeans (Ostrya carpinifolia) as street trees. How can they be reliably distinguished, especially when there is no fruit on ...
  • 475
2 votes
1 answer
174 views

Identification: tall conifer with tamarisk-like leaves

I am looking to identify a conifer that I found in a public park. Please see below for pictures of the leaves, bark and habit (click for full-size view). I normally use Pl@ntNet for identification, ...
  • 475
3 votes
0 answers
39 views

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 ...
  • 31
4 votes
1 answer
77 views

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
  • 660
1 vote
1 answer
61 views

What kind of tree has leaves like this?

Shot taken in Spring, on May 22, 2020 in a forest in Haliburton, Ontario.
  • 655
2 votes
1 answer
97 views

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.
  • 655
1 vote
0 answers
64 views

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 ...
's user avatar
2 votes
0 answers
67 views

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?
2 votes
1 answer
162 views

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?
  • 197
7 votes
1 answer
106 views

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 ...
1 vote
1 answer
76 views

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 ...
  • 295
1 vote
0 answers
41 views

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.
1 vote
0 answers
48 views

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. ...
's user avatar
0 votes
0 answers
39 views

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?
2 votes
2 answers
155 views

What made this pile of tiny poops at the base of an old oak? Eastern Long Island, NY

I ran across three trees (all with cavities) that had mounds of these small droppings at their base. These were approximately 50-100 meters from the shore of a salt marsh on the east end of long ...
4 votes
1 answer
107 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. ...
  • 243
2 votes
0 answers
44 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? ...
-1 votes
1 answer
68 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 ...
  • 1
1 vote
1 answer
48 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 ...
's user avatar
3 votes
1 answer
54 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 ,...
1 vote
0 answers
270 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 ...
  • 228
3 votes
1 answer
41 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 ...
  • 4,909
3 votes
1 answer
97 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 votes
1 answer
103 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 ...
  • 173
0 votes
1 answer
62 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 ...
1 vote
0 answers
21 views

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 ...
  • 11
1 vote
1 answer
154 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 ...
  • 177
1 vote
1 answer
178 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 ...
  • 4,909
1 vote
0 answers
40 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 votes
1 answer
32 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 ...
  • 217
6 votes
1 answer
685 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 ...
  • 111
0 votes
1 answer
74 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?
  • 1
6 votes
1 answer
585 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 ...
  • 161
0 votes
2 answers
103 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 ...
's user avatar
6 votes
1 answer
181 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 ...
2 votes
1 answer
135 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 ...
2 votes
1 answer
110 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 ...
's user avatar
0 votes
2 answers
115 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 votes
0 answers
52 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 ...
1 vote
0 answers
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?
0 votes
4 answers
154 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 ...
's user avatar
1 vote
0 answers
36 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 ...
  • 11
1 vote
0 answers
44 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-...
  • 111
5 votes
1 answer
146 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 ...
  • 317