Saturday, October 16, 2021

[Botany • 2021] Typhonium aungmyintwinii (Araceae) • A New Species from Mogok Township, Mandalay Region [Taxonomic Studies of Araceae in Myanmar III]

Typhonium aungmyintwinii K.Z.Hein & Naive 

in Hein et Naive, 2021. 
Photos by: K.Z. Hein.

Typhonium aungmyintwinii K.Z.Hein & Naive is herein described and illustrated as a species new to science discovered in Mogok Township, Mandalay, Myanmar. Detailed description, colour plate, distribution, phenology and ecology of this new endemic Typhonium species are provided below.

Keyword: Areae, Aroideae, Biodiversity, Burma, Southeast Asian Flora, Typhonium inopinatum, T. roxburghii, T. varians

Typhonium aungmyintwinii K.Z.Hein & Naive.
 A. Excavated plant B. Leaf C. Front view of inflorescence D. Side view of inflorescence E. Spathe tube longitudinally cut open spathe showing the spadix.
Photos by: K.Z. Hein.

Typhonium aungmyintwinii K.Z.Hein & Naive, sp. nov.

Diagnosis: This new species is morphologically similar to Typhonium roxburghii Schott (Fig. 2C) and T. varians Hett. & Sookchaloem (Fig. 2D). But it differs significantly in having a lanceolate spathe limb (vs. ovate to ovate-lanceolate in T. roxburghii and triangular ovate in T. varians) and two to three whorls of laterally compressed, sickle-shaped, glabrous staminodes with half of their length curved downwards (vs. more than three whorls of filiform, weakly papillose staminodes which are spreading and slightly decurved at their tips in T. roxburghii and four to six whorls of subulate, glabrous staminodes, of which the upper staminodes are short, straight and pointing outwards and the lower staminodes are strongly curved downwards over their entire length in T. varians).

Spathe tube longitudinally cut open spathe showing the spadix.
A. Typhonium aungmyintwinii K.Z.Hein & Naive.
B. T. inopinatum Prain (Sagaing Region, Myanmar).
C. T. roxburghii Schott (Mon State, Myanmar).
D. T. varians Hett. & Sookchaloem (Nakhon Ratchasima Province, Thailand).
Photos by: K.Z. Hein (A & B), Nyi Nyi Htway (C) and Tomoki Sando (D).

Distribution and habitat: The species is currently only known in Lower Pein Pyit Village, Mogok Township of Pyin Oo Lwin District, Mandalay Region, Myanmar and grows under the shade of evergreen forest at elevations ca. 1400 m asl. 

  Eponymy: The specific epithet is named after Mr. Aung Myint Win, a plant enthusiast who discovered and first collected this species.  

Khant Zaw Hein and Mark Arcebal K. Naive. 2021. Taxonomic Studies of Araceae in Myanmar III: Typhonium aungmyintwinii, A New Species from Mogok Township, Mandalay Region. Taiwania. 66(4); 455-458. DOI: 10.6165/tai.2021.66.455