Aristolochia bhamoensis (subgen. Siphisia, Aristolochiaceae), a new species and a diagnostic key to known Siphisia species from Myanmar

10 April 2018

Do, Truong

Aristolochia bhamoensis from Myanmar is here described and illustrated. The new species is morphologically similar to A. faviogonzalezii (confined to northern Vietnam) and A. cathcartii (growing in the Himalayan region) but can be distinguished from those two species by having a cream-white upper parts of perianth tube, with visible purple ridges, a trumpet-shaped limb, 5–5.5 cm diameter, inner surface of limb lobes densely covered with dark-purple bristles, a nearly circular mouth, 3.2–3.5 cm wide, upper half of throat being dark-purple to blackish, without striations or dots, and lower half purple, with visible white striation. Morphological characters such as a 3-lobed gynostemium and a 3-lobed limb support a placement of the new species in the subgenus Siphisia. A diagnostic key is provided to the seven known Siphisia species from Myanmar.