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Family: STEMONACEAE 

 Stemona collinsae
 
  
Author:  William Grant Craib 1920
Family:  Stemonaceae
Habitat:  Central Asia
Soil:  Sand
Water:  Medium
Sun:  Medium
Thickness:  1,5 centimetres
Height:  75 centimetres
Flower:  Dark Purple/Green
Reproduction:  Seeds/Dividing of the centre
Pop names:  -
Synonyms:  -
Got it from:  Oostvoorne, The Netherlands
Year:  2004
I received those two plants with the names: S. sessilifolia (the one in left side) and S. tuberosa (right column). At that time, there wasn't much info on the web.

 I was contacted by Professor Paul But from the university of Hong Kong. He made a DNA-analyse, and it turned up as same species: S. collinsae.

The flowers are not alike each other, nor do they look like the other flowers I can find at the web.

I am pretty sure, the same species has been sold all over Europe, and many plants has been miss-identified. 

    This member of the Stemonaceae family was described by William Grant Craib in 1920. It is found in the central Asia, growing in sand or other well drained soil with some water and some sun. The roots grow to 15 millimetres in diameter, the vines up to 75 centimetres long. The flowers are dark purple and green.

A piece of work on Stemona Alkoloids.