Ipomoea darainensis Deroin, Ranir. & Nusb. (Convolvulaceae), une nouvelle espece de Madagascar

摘要

Ipomoea darainensis Deroin, Ranir. & Nusb. (Convolvu-laceae), a new species from northern Madagascar in Darainaregion, is described and illustrated, and its conservation sta-tus briefly discussed. It appears closely related to Ipomoeaandroyensis Deroin, another endemic species from the farsouth of Madagascar, and to the Tanzanian Ipomoea (Stic-tocardia) lutambensis Schulze-Menz. Such an extant distri-bution suggests the three species diverged from an ancestralstock early, perhaps at the time Madagascar separated fromAfrica. The relevance of the Daraina region for the Mala-gasy phytogeography is discussed.