The Ehrhartoideae is a subfamily of the true grass family Poaceae.

Tricholaena is a genus of Asian, African, and Italian plants in the grass family.

Thelepogon is a genus of Asian, African, and Australian plants in the grass family.

Thaumastochloa is a genus of Australian, Papuasian, and Indonesian plants in the grass family.

The woman wouldn't stop coughing and sneezing because she was allergic to grasses.

That's a geranium pollen.

I am allergic to pollen.

But anyway, take a look at its pollen.

Tom is allergic to pollen.

He's allergic to pollen.

Cool pollen, though.

Perhaps there's more pollen in the city.

Its diet consists primarily of fruit, nectar, and pollen.

Pollen can cause severe allergic reactions.

Pollen is produced by the anthers of flowers.

That tells me that it's actually been fossilized, this pollen.

The fossilized pollen was not of savanna vegetation.

Probably you are allergic to pollen or dust.

A lot of people are dealing with hay fever now.

Jonathan Drori Every pollen grain has a story

Now, much of the pollen will still be there after repeated washings.

And there is as many different kinds of pollen as there are flowering plants.

Paul, an apostle of Christ Jesus through the will of God, and Timothy our brother,

Paul, an apostle of Jesus Christ by the will of God, and Timotheus our brother,

And the reason for that is they've got to chuck out masses and masses of pollen to have any chance of the pollen reaching another plant of the same species.

So, what are pollen's properties? I hear you ask.

Four very different habitats might look similar, but they've got very different pollen signatures.

And then they were so clever, they found a way to analyze fossilized pollen.

With the trains coming in to urban hubs, they can carry pollen with them, very light pollen, and it's just a big supermarket in the city.

So, that's 20 micrometers across, that pollen grain there.

Most pollen that causes hay fever for us is from plants that use the wind to disseminate the pollen, and that's a very inefficient process, which is why it gets up our noses so much.

Timothy, my fellow worker, greets you, as do Lucius, Jason, and Sosipater, my relatives.

Timotheus my workfellow, and Lucius, and Jason, and Sosipater, my kinsmen, salute you.

But not all pollen is quite so simple looking.

Like I said, pollen carries the male sex cells.

The pollen has little barbs on it, if we look.

But pollen forensics can be very subtle.

Here is a scanning electron micrograph of a grain of pollen.

At night they get covered in pollen, which showers down over them, and then the bristles that we saw above, they sort of wilt and allow all these midges out, covered in pollen fabulous thing.

Pollen is tiny. It gets on to things, and it sticks to them.

Paul, a prisoner of Christ Jesus, and Timothy our brother, to Philemon, our beloved fellow worker,

Paul, a prisoner of Jesus Christ, and Timothy our brother, unto Philemon our dearly beloved, and fellowlabourer,

Books are the bees that carry pollen from one mind to another.

Each anther can carry up to 100,000 grains of pollen, so, it's quite prolific stuff.

A different pollen signature, if you like, or a different pollen fingerprint.