7 votes
Accepted

Can plants be pathogenic towards humans?

Yes: Protothecosis is infection of the bloodstream by a genus of non-green algae. There are also odd reports of infection by green algae, such as this one.
bob1's user avatar
  • 12k
6 votes
Accepted

Is it viable to make liquid potassium ferilizer through dissolving very small amounts of potassium chloride in water

the issue here is the chloride not the potassium. Potassium chloride is very soluble in water. but you could be killing your crops/garden when you spray it on. Most plants do not tolerate much ...
shigeta's user avatar
  • 28.2k
6 votes

Yellow dandelion-like flowers emerging from beach in early spring

Not certain, but it looks pretty well like it could be Tussilago farfara (colt's foot or coltsfoot). It's a common invasive plant in your area. https://en.wikipedia.org/wiki/Tussilago https://www.fs....
Plantaloons's user avatar
6 votes
Accepted

What kind of plant is this? (looks like periwinkle)

You're correct, it's periwinkle. Common periwinkle is a low-growing mat-forming, vine-like perennial nonwoody plant with green, shiny, smooth stems that are woody at the base. It spreads by ...
anongoodnurse's user avatar
5 votes
Accepted

Hypothetical violation of independence assumption for linear models

Observations are assumed to be independent, not predictors. For example, if you were doing some chemical fertilizer treatment, you'd probably not apply a random chemical or random dose of chemical to ...
Bryan Krause's user avatar
  • 45.6k
4 votes
Accepted

Does the use of "var", "x", and/or "ssp" in a scientific name provide specific information?

Does the use of "var", "x", and/or "ssp" in a scientific name provide specific information? Yes, those terms denote the rank of the taxon in question. Does the use of &...
Darlingtonia's user avatar
  • 2,527
4 votes
Accepted

Help identify parasitic plant on oak seedling

I think these are galls produced by a wasp in the genus Andricus. Here are some produced by A. polyceras: However, there are many species in this genus so more detail would be needed to narrow it ...
Darlingtonia's user avatar
  • 2,527
4 votes
Accepted

What Causes the White Layer on These Leaves?

The major problem your plant has here is a very heavy scale insect (Coccomorpha) infestation. These are sucking insects that bite into the veins of plants and suck the sap. They are related to aphids, ...
bob1's user avatar
  • 12k
4 votes

Is it possible to live without iodine? (sea plants, seaweed or fish?)

Iodine is a component of the thyroid hormones, thyroxine and triiodothyronine, so it is indeed a human nutritional requirement. According to this Harvard University webpage, milk (especially), eggs ...
David's user avatar
  • 25.7k
3 votes

Why is tautonymy forbidden in botany?

Short of someone from either one of those committees being on here and seeing the question the answer is "Because we said so". The respective committees are the authorities on the subject ...
bob1's user avatar
  • 12k
3 votes
Accepted

Is kranz anatomy not a defining feature of $C_4$ plant?

Your conclusion doesn't follow logically. Statement 1: C4 plants have photosynthetic bundle sheath cells arranged in a Kranz anatomy. (I was actually not able to find your quote in the linked chapter, ...
Maximilian Press's user avatar
3 votes
Accepted

Identify a hanging plant with spherical leaves

It seems that this might be Curio rowleyanus, sometimes called "string-of-pearls". The Wikipedia article indicates it has spherical leaves about 6mm in diameter on trailing stems up to ...
mgkrebbs's user avatar
  • 9,054
3 votes

Identifying a plant in the botanical garden of Paris

@sir-thinksalot is correct. This is an Ephedra species. You can have a look at this PDF to get some spatial orientation - it should be with the Gnetales. You can look which species of Ephedra are ...
aae's user avatar
  • 384
3 votes
Accepted

Why is it essential to uproot a plant just before flowering in order to see nodules?

It isn't necessary to pull them just before flowering. It is merely that the optimal time to check for effective nodulation is about 10-12 weeks post emergence, which also happens to be about the same ...
bob1's user avatar
  • 12k
3 votes

Are there any plants that fix their own nitrogen?

Though it's not a land plant, and even does not fall into Archeaplastida, the haptophyte, Braarudosphaera bigelowii, has a nitrogen-fixing endosymbiont and recently confirmed as a fully dependent ...
andylinpersonal's user avatar
3 votes

Are these objects we found ambergris? How to distinguish ambergris from other deposits/minerals

This is unlikely to be ambergris. As I understand it, ambergris tends to darken with age and be a waxy substance with a low (~60 C/140 F) melting temperature. and should melt a little in your hands to ...
bob1's user avatar
  • 12k
2 votes

What is the purpose of DMT in plants?

Just pointing out that there is no evidence that endogenous DMT in humans is produced by the pineal gland. There has been much speculation, but the few studies that have measured DMT in human ...
chris watts's user avatar
2 votes

Identifying a plant in the botanical garden of Paris

Given the exhibit was about primitive plants, my best guess is a gnetophyte, most likely a species of Ephedra going on appearances.
Sir Thinksalot's user avatar
2 votes

Which plants are best for experiments about plant growth?

Arabidopsis is a common model organism for classroom lab experiments, used because of a rapid growth cycle (days is probably too short, but a couple weeks would work). It would be suitable for proof-...
Bryan Krause's user avatar
  • 45.6k
2 votes

Which kind of inflorescence(s) does Sonchus oleraceus have?

A flowering plant's inflorescence is the grouping of flower clusters on the plant. Inflorescences are categorized based on the architecture of the arrangement of flowers within them. As members of the ...
Darlingtonia's user avatar
  • 2,527
2 votes

Does my dracaena marginata have spider mites?

Short answer: probably not. Longer answer: Spider mite infestations present with very fine webbing coating whole areas of the plant, generally whole leaves and the stem. Within this webbing you should ...
bob1's user avatar
  • 12k
2 votes

White oak germination in autumn — Leaves or just roots?

Nice that you started observing so early, so I can complete this here while learning something. I usually only get aware of the new oaks when stem and leaves are sprouting in the lawn, and, yes, that'...
Falko's user avatar
  • 121
2 votes

Why does hydroponic basil grow a thick stem?

Where it originated in warm regions, basil is a perennial. According to Better Homes and Gardens Most types of culinary basil are native to warm regions of Asia and Africa. They grow as perennial ...
Rich's user avatar
  • 311
1 vote

What indoor plants or groups of plants are significant consumers of CO2?

Possibly one of the extremely fast growing aquatic plants such as Azolla might be an option. Plants in this genus are sometimes mentioned as carbon dioxide remediation mechanisms due to their ...
Maximilian Press's user avatar
1 vote
Accepted

What happens if a lysosome is pierced and it's enzymes are made to get released

Enzymes of lysosome are usually inactive and are activated only in low pH environments, so I guess, randomly puncturing a lysosome wouldn't affect the cell to any serious extent unless the cell is an ...
Moist CottonCandy's user avatar
1 vote

Why is coconut a fleshy fruit?

The drupe definition from other answers is correct: it is a fruit with a fleshy outer part (exocarp and mesocarp), and a single hard endocarp. A drupe does not split open on its own (it is indehiscent)...
Darlingtonia's user avatar
  • 2,527
1 vote

What plants are these

Take these with a grain of salt, as it is quite difficult to tell from a single, far-away, picture, and I am no expert on aquaria or aquarium plants. The narrow-leaved (lanceolate) one appears to be ...
bob1's user avatar
  • 12k
1 vote

What is the relation between Transpiration and Physiological support in plants

When transpiration increases, the rate at which water evaporates from the plant's leaves also increases. This creates a negative pressure (tension) in the xylem, which helps to pull water up from the ...
Ke Keiss's user avatar
1 vote

Vine has simple and compound leaves

As a novice, my guess is Boston Ivy (Parthenocissus tricuspidata). Eastern Poison Ivy vs Boston Ivy Boston Ivy: A deciduous woody vine native to east Asia, introduced in North America. Established in ...
User1974's user avatar
  • 852
1 vote

Is this plant in my urban garden poison ivy?

Almost certainly Toxicodendron (poison ivy) genus; I think Toxicodendron rydbergii (western poison ivy). Leaves are in threes, with the central one longer than the others. Leaves are variable in ...
bob1's user avatar
  • 12k

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