[Hilary]

A stamp issued by Bulgaria in 1964 featuring Maliovica / Malyovitsa Peak and Pine trees.

We haven’t been to this area of Bulgaria but I have a photo of a pine tree near Sofia and some of its pine cones 

[Hilary]

Clouds
In 2004 the USA issued a sheet of 15 stamps all featuring clouds with information about each cloud type on the back.

Cumulonimbus mammatus

[Hilary]

Erinaceus europaeus,  Hedgehog

Five stamps issued by the UK in 1977 in a series named British Wildlife, Illustrated by Patrick Oxenham.
PHQ cards were also issued at the same time 
Several months ago, a friend of mine sent me the set of postcards depicting animals of the UK.

  Together with the Hedgehog you can clearly see some wild flowers.

[Hilary]

Saccharum officinarum, Sugar cane

Uganda issued a series, named Food, of 14 stamps in 1975

Sugar cane is mentioned in GRASSES IN PELION
by Sue Wake

THE MEDITERRANEAN GARDEN number 96, April 2019

A photo of sugar cane being transported on the Nile

[Hilary]

Zea mays, Maize

Uganda issued a series, named Food, of 14 stamps in 1975

Zea mays is mentioned in GRASSES IN PELION

 By Sue Wake
THE MEDITERRANEAN GARDEN number 96, April 2019

Unfortunately, a part of the stamp is hidden.

And my standard photo which goes with any post about stamps showing Maize

[Hilary]

Clouds
In 2004 the USA issued a sheet of 15 stamps all featuring clouds with information about each cloud type on the back.
Cumulonimbus incus

[Hilary]

Lutra lutra, Otter

Five stamps issued by the UK in 1977 in a series named British Wildlife, Illustrated by Patrick Oxenham.
PHQ cards were also issued at the same time 

Several months ago, a friend of mine sent me the set of postcards depicting animals of the UK.

 On the card you can clearly see some wild flowers.

[Hilary]

Clouds
In 2004 the USA issued a sheet of 15 stamps all featuring clouds with information about each cloud type on the back.
Altocumulus stratiformis