[Botany • 2021] Thottea aroangensis (Aristolochiaceae) • A New Species from central Vietnam

Thottea aroangensis T.A. Le, D. Dien & Tagane

in Le, Dinh, ... et Tagane, 2021. 

Tốt hoa a roàng || DOI: 10.11646/phytotaxa.513.1.5

Abstract

Thottea aroangensis T.A. Le, D. Dien & Tagane (Aristolochiaceae) is described based on the specimen collected from the A Roang commune, A Luoi district, Thua Thien Hue province, central Vietnam. This species is characterized by subshrub habit 70–90 cm tall, inflorescence at base of stem close to ground level, campanulate and obscurely lobed perianth ca. 2.6 cm long, inside of perianth tube with creamy white patches, and 20 stamens in 2 whorls, by which combination it is clearly distinguished from the other species of Thottea in Vietnam and its surrounding countries. Morphological descriptions, photographs, a distribution map, vernacular name, and preliminary conservation status are provided for T. aroangensis.

Keywords: angiosperms, flora, Indochina, Piperales, taxonomy, Thua Thien Hue

Thottea aroangensis T.A. Le, D. Dien & Tagane.
C. Inflorescence with flowers and immature fruits; D. Flowers (lateral view); E. Flower (front view); F. Flower corolla removed, showing stamens and pistil; G. Corolla dissected showing the coloration of inner surface.

Thottea aroangensis T.A. Le, D. Dien & Tagane.
A. Habit; B. Leaves (abaxial surface).

Thottea aroangensis T.A. Le, D. Dien & Tagane, sp. nov. 

 TYPE:—VIETNAM. Thua Thien Hue province: A Luoi district, A Roang commune, 16°07′39.17″N, 107°24′39.59″E, ± 850 m a.s.l., 18 April 2021, Dien Dinh, Quoc Tuan Doan, Quang Hoa Anh Nguyen, Tuan Anh Le LTA 1101 (holotype VNMN!). 

Thottea aroangensis is characterized by subshrub habit 70–90 cm tall, inflorescence at base of stem close to ground level, campanulate perianth ca. 2.6 cm long, inside of perianth tube with creamy white patches, obscure perianth lobes very broadly triangular ca. 0.5 cm long, and 20 stamens in 2 whorls, which the combination of characters clearly distinguished it from all the previously known species of the genus.

Etymology:—The specific epithet is derived from its type locality, A Roang commune, located in A Luoi district, Thua Thien Hue province, central Vietnam. 

Vernacular name:—Tốt hoa a roàng

Tuan Anh Le, Dien Dinh, Quac Tuan Doan, Quang Hoa Anh Nguyen and Shuichiro Tagane. 2021. Thottea aroangensis, A New Species of Aristolochiaceae from central Vietnam. Phytotaxa. 513(1); 69–74. DOI: 10.11646/phytotaxa.513.1.5