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| Marsdenia burmanica Wen B.Xu & J.Y.Shen, in Xu, Liu, Yan & Shen, 2022. 緬甸牛奶菜 || taiwania.ntu.edu.tw |
Abstract
Marsdenia burmanica Wen B.Xu & J.Y.Shen (Apocynaceae), a new species from Hongga Mountain, Putao County, Kachin State, Myanmar, is described and illustrated. It is similar to M. hainanensis, M. sinensis, and M. tenii, but differs from them by campanulate flowers, fusiform gynostegium exserted from the corolla tube, 2-cleft stigma head, purple corolla and a corona of 2 oval protrusions at the base of the corona. Photographs, line drawing, distribution, comparison with related species, and a conservation assessment are provided for this rarely observed species.
Keyword: Apocynaceae, Kachin, Marsdenia hainanensis, M. sinensis, M. tenia, Myanmar
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| Marsdenia burmanica Wen B.Xu & J.Y.Shen. A. Section of trailing plant in habit. B. Flower in lateral view. C. Dissected and spread open corolla showing inner side. D. Anther in ventral view. E. Anther and corona in side view. F. Flowers with corolla removed (lateral view). G. Gynostegium in lateral view. H. Pollinia. Drawn by Jing-Jing Yan. |
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| Marsdenia burmanica Wen B.Xu & J.Y.Shen. A. Twig showing leaf orientation and position of inflorescences. B. Inflorescence in lateral view. C. Flower in ventral view. D. Inflorescence in ventral view. E. Leaves showing abaxial (right) and adaxial (left) surface. F. Leaves adaxial (above) and abaxial (below) surface indumentum. G. Gynostegium in ventral view, showing 2-cleft stigma head. H. Corona lobes, showing 2 oval protrusions in lateral view at base of gynostegium. I. Gynostegium in lateral view; showing oval-conical form. J. Pollinarium. Photos by Jian-Yong Shen. |
Marsdenia burmanica Wen B.Xu & J.Y.Shen, sp. nov.
Diagnosis: Marsdenia burmanica is morphologically
similar to M. hainanensis, M. sinensis, and M. tenii (Table
1), but differs from M. hainanensis in the fusiform
gynostegium, 2-cleft stigma head, purple corolla and 2
oval protrusions; and differs from M. sinensis in the
fusiform stigma head, purple corolla and 2 oval
protrusions at the corona base; and also differs from M.
tenii in dichasial cyme, fusiform gynostegium, purple
corolla and 2 oval protrusions.
Distribution & habitat: At present, M. burmanica has
only been found in the type locality. It grows in the sunny
part of hillsides, at an elevation of ca. 900 m.
Etymology: The new species found in northern
Myanmar, thus the specific epithet “burmanica” was
chosen. The Chinese name is “緬甸牛奶菜”.
Wen-Bin Xu, Yan-Ling Liu, Jing-Jing Yan and Jian-Yong Shen. 2022. Marsdenia burmanica (Apocynaceae, Asclepiadoideae), A New Species from Kachin, Myanmar. Taiwania. 67(3); 450-454. DOI: 10.6165/tai.2022.67.450
