Aristolochia austroyunnanensis S. M. Hwang, a new record for the flora of vietnam

Aristolochia austroyunnanensis S. M. Hwang (family Aristolochiaceae), a species endemic to southern China, is newly recorded for the flora of Vietnam. This newly recorded species belong to subgenus Siphisia and is most similar to Aristolochia petelotii O. C. Schmidt and Aristolochia fangchi C. Wu ex L. D. Chow & S. M. Hwang. Detailed morphological descriptions and color illustrations, together with information on distribution, habitat, phenology, and taxonomic notes are given. An identification key to all known Siphisia species in Vietnam is also provided.
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Aristolochia austroyunnanensis S. M. Hwang, a new record for the flora of vietnam ACADEMIA JOURNAL OF BIOLOGY 2023, 45(2): 71–79 DOI: 10.15625/2615-9023/17557 Aristolochia austroyunnanensis S. M. Hwang, A NEW RECORD FOR THE FLORA OF VIETNAM Pham Van The2,3, Trinh Ngoc Bon4, Le Thi Thanh Huong5, Do Van Truong1,* 1 Vietnam National Museum of Nature, VAST, Vietnam 2 Science and Technology Advanced Institute, Van Lang University, Ho Chi Minh, Vietnam 3 School of Engineering and Technology, Van Lang University, Ho Chi Minh, Vietnam 4 Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Vietnam 5 Thai Nguyen University of Science, Thai Nguyen, Vietnam Received 5 October 2022; accepted 24 May 2023ABSTRACT Aristolochia austroyunnanensis S. M. Hwang (family Aristolochiaceae), a species endemic to southern China, is newly recorded for the flora of Vietnam. This newly recorded species belong to subgenus Siphisia and is most similar to Aristolochia petelotii O. C. Schmidt and Aristolochia fangchi C. Wu ex L. D. Chow & S. M. Hwang. Detailed morphological descriptions and color illustrations, together with information on distribution, habitat, phenology, and taxonomic notes are given. An identification key to all known Siphisia species in Vietnam is also provided. Keywords: Aristolochia, Aristolochia austroyunnanensis, new record, Siphisia, Vietnam.Citation: Pham Van The, Trinh Ngoc Bon, Le Thi Thanh Huong, Do Van Truong, 2023. Aristolochiaaustroyunnanensis S. M. Hwang, a new record for the flora of Vietnam. Academia Journal of Biology, 45(2): 71–79.https://doi.org/10.15625/2615-9023/17557* Corresponding author email: dovantruong_bttn@yahoo.com©2023 Vietnam Academy of Science and Technology (VAST) 71 Pham Van The et al.INTRODUCTION (2017) distinguished A. austroyunnanensis The genus Aristolochia Linnaeus (1753) from A. petelotii by the difference ofsensu lato is the largest genus of family morphological characters of the lamina, theAristolochiaceae, and is widely distributed inner surface of limb lobes as well as the colorthroughout the tropics, subtropics and also of the throat.extending to temperate regions (Huber, 1993; During recent botanical surveysHwang et al., 2003). According to traditional addressing diversity of genus Aristolochia intaxonomic and recent phylogenetic studies, Vietnam, we also recorded A.the genus can be subdivided into three austroyunnanensis occurring in Bat Xatmonophyletic subgenera, viz. subgenus Nature Reserve, Lao Cai province and PhiaAristolochia, subgenus Siphisia (Duch.) O. C. Oac-Phia Den National Park, Cao BangSchmidt, and subgenus Pararistolochia province, Northern Vietnam, which has not(Hutch. & Dalziel) O. C. Schmidt (Schmidt, yet been recorded from Vietnam in the1935; Ma, 1989; Wanke et al., 2006; Ohi- previous studies (Hwang, 1981; Ma, 1989;Toma & Murata, 2016). Although Zhu et al. Hwang et al., 2003; Do et al., 2015; Zhu et al.,(2019) recognized Isotrema Raf. as including 2017). Therefore, we here report A.all species of subgenus Siphisia, we continue austroyunnanensis as a new record for theto include them in Aristolochia, as has been flora of Vietnam. This species has a stronglywidely accepted in other studies (Cai et al., curved perianth, a 3-lobed limb, and a 3-lobed2020; Phan et al., 2021; Do et al., 2021a, gynostemium, placing it into the Aristolochia2021b, 2023; Do & Hoang, 2022). subgenus Siphisia. Detailed morphological Within the Indo-Chinese floristic region, description and color illustrations togethersouthern China and Vietnam were considered with information on distribution, habitat,the most diverse with respect to Aristolochia phenology, and taxonomic notes are given andin Asia, especially subgenus Siphisia (Do et an identification key to all known Siphisiaal., 2015). A total of 20 species of the species in Vietnam is also provided.subgenus Siphisia were recorded for the floraof Vietnam (Do et al., 2019, 2021a, 2021b, MATERIALS AND METHODS2023; Do & Hoang, 2022). T ...