There are many interesting and strange species in the Nature. Here you can find some of them.
Impatiens Psittacina (Parrot Flower)

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Impatiens psittacina is a rare flower that looks like a parrot. Hence this flower is called parrot flower. This rare species grow in Thailand and in limestone soil with a pH that is higher than normal. The flower is normally in the size of 5cm and blooms in October and November. As this is rare species Government of Thailand imposed a ban on exporting these species.

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Spider flowers (flowers that look like spider) belong to Grevellia genus.

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Grevellia Speciosa - Red Spider Flower
Spider flower hangs from a stalk like a spider suspended from its web. In the image blow you can see it clearly.

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Commonly there are five types of spider flowers. They are red, pink, grey, green and white. Generally these flowers flower in spring and winter. Spider flowers are prevalent in Sydney, Australia.
Bladder Campion (Silene Vulgaris)

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Bladder Campion is a weed that occurs throughout most of the United States and Europe.
This flower appears like bladder.

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Lithops

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image sourceWhat do you think the above images? They appear as if flowers are grown to stones. But they are lithops otherwise known as living stones or flowering stones. Lithops is a genus of rare plants native to South Africa. These water-retaining plants grow in the desert regions. They appear like pebbles by blending in with surrounding pebbles to avoid being eaten by predators.
Lithops cannot wilder for a year even though they do not have sufficient water. Some species of these plants can live 7,500 feet above the sea level. Another specialty of these is they can bear the temperature of 46°C. Generally these plants flower in autumn. The germination process of these species is quite interesting. All seeds are layered in a cup-shaped structure, when rain falls, this cup opens and the seeds fall on the ground. Then the cup closes and opens again when there is rain.