Iran at the Philakorea 2002 World Stamp Exhibition

To commemorate their participation at the Philakorea 2002 World Stamp Exhibition, Iran Post issued a set of four stamps series of poisonous herb plants on August 2, 2002. 

The herb plants depicted on issued stamp are  Hyoscyamus muticus, Frittillaria, Calotropis procera,  and Ranuculus. All stamps have same face value.

 
 

Hyoscyamus muticus

Hyoscyamus muticus is  poisonous herb whose leaves are a source of hyoscyamine. Hyoscyamus is a small genus of flowering plants in the nightshade family, Solanaceae. The eleven species it contains are known generally as the henbanes. All of them are toxic. Hyoscyamus muticus  is one of the  species of  Hyoscyamus genus.

Frittillaria

Fritillaria is a genus of about 100 species of bulbous plants in the family Liliaceae, native to temperate regions of the Northern Hemisphere.

Most fritillaries contain poisonous alkaloids such as imperialin; some may even be deadly if ingested in quantity.

Fritillaria is also used as an herb in Traditional Chinese Medicine, known by the Chinese name Chuan Bei Mu.They often have nodding, bell- or cup-shaped flowers, and the majority are spring-flowering. Most species' flowers have a rather disagreeable scent, often referred to as "foxy," like feces or wet fur.

Calotropis procera

Calotropis procerais a species of flowering plant in the dogbane family, Apocynaceae, that is native to North Africa, Tropical Africa, Western Asia, South Asia, and Indochina. It is commonly known as apple of Sodom, a name derived from the Hebrew Tapuah Sdom. 

The green globes are hollow but the flesh contains a toxic milky sap that is extremely bitter and turns into a gluey coating resistant to soap.The milky sap contains a complex mix of chemicals, some of which are steroidal heart poisons known as "cardiac aglycones".

Ranuculus

Ranunculus  is a large genus of about 600 species of plants in the Ranunculaceae.They are mostly herbaceous perennials with bright yellow or white flowers (if white, still with a yellow centre); some are annuals or biennials. A few species have orange or red flowers.

Ranunculus species are used as food plants by the larvae of some Lepidoptera species. Some species are popular ornamental flowers in horticulture, with many cultivars selected for large and brightly coloured flowers. All Ranunculus species are poisonous when eaten fresh by cattle, horses, and other livestock.