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Quest about Euphorbia horwoodii


In preparation of an article about this species I need some information. I hope you will react when you think you know one or more answers on the questions put to you here, or anything else you think is worth knowing about Euphorbia horwoodii. Thank you very much!

There seems to be more than one taxa involved for Euphorbia horwoodii known in cultivation. I grow four different clones.
Seedlings of Euphorbia horwoodii are reported to form a sphere in the juvenile stage and form sidearms later. This form is pictured as a grafted seedling, and you can see the sidearms are just about to develop. The other picture of a seedling does not form a sphere at all and grows as a branch right from start.

Questions:
1. Are there more clones in cultivation than these ones?
2. Are these two types of flowers and seedlings related to certain localities in Somalia?
3. Are they perhaps hybrids?
4. Who knows what B&L stands  for and what are the locality-data of this plant?

euphorbia horwoodii colne 1

euphorbia horwoodii clone 2 euphorbia horwoodii clone 3 B&L 587 e. horwoodii clone 4
Clone 1 is probably the oldest in cultivation and the most robust one of all. As you can see the cyathium is quite long with a long exserted stigma Clone 2 is only slightly smaller than clone 1, also of unknown origin. Clone 3 is the B&L 587 clone. This is the weakest one and remarkable for its slightly bend spines. Clone 4 originates from Arid Lands are has a blue body colouring. The cyathia appear to be much more normal in appearance than clone those of clone 1
e. horwoodii flower clone 1 e. horwoodii flower clone 4 e. horwoodii grafted seeling euphorbia horwoodii seedling
Flower clone 1 Flower clone 4 Grafted seedling,  you can see the sidearms are just about to develop This seedling does not form a sphere at all and grows as a branch right from start.

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