What is "haematostemon"

Haematostemon is a genus of plant of the family Euphorbiaceae first described as a genus in 1919. It is native to northeastern South America ( Guyana and S Venezuela).

1. Haematostemon coriaceus (Baill.) Pax & K.Hoffm. - Amazonas State in S Venezuela
2. Haematostemon guianensis Sandwith - Potaro-Siparuni region of Guyana