Hypericum decaisneanum

Species of flowering plant of the St. John's wort family

Hypericum decaisneanum is a species of flowering plant in the St John's wort family Hypericaceae. Named for botanist Joseph Decaisne, it is a small perennial herb that grows mostly upright. It has thick, papery leaves and up to twenty flowers with bright yellow petals. Endemic to the Jebel al Akhdar province of Libya, H. decaisneanum is found in the cracks of limestone rocks on steep escarpments. It is a member of numerous plant communities and associations of chasmophytes, of which it is sometimes a key species. Originally described in 1899, the species was originally placed in section Taeniocarpium of the genus Hypericum, but conflicting relationships have meant it has been treated more recently as a member of section Adenosepalum.

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