Three New Species and Three New Records of <I>Aristolochia</I> Subgenus <I>Siphisia</I> from Vietnam Including a Key to the Asian Species

Abstract

Aristolochia subgenus Siphisia comprises about 70 species, with a disjunct East-and South Asian to North-and Central American distribution. Here we describe and illustrate three new species of Aristolochia subgenus Siphisia from Vietnam: Aristolochia faviogonzalezii, A. tonkinensis, and A. tadungensis. The first two species are found in northern Vietnam while the latter occurs in southern Vietnam. Diagnostic characters distinguish the new species from their morphologically close relatives. Their distribution, ecology, phenology, ethnobotany, and conservation status are presented as well. In addition, three species are newly reported for the flora of Vietnam that were until now restricted to China, namely A. fangchi, A. hainanensis, and A. utriformis. An identification key to all Asian species of Aristolochia subgenus Siphisia is provided.

Aristolochia sinoburmanica (Aristolochiaceae), a new species from north Myanmar

“…The description of the new species follows the terminology used by Hwang et al (2003) and Do et al (2015a). This new species was compared with the morphologically similar species A. hainanensis Merrill, A. saccata Wallich and also the recently published new species A. xuanlienensis (Huong et al 2014), A. faviogonzalezii T. V. Do, S. Wanke & C. Neinhuis and A. tonkinensis T.V.…”

“…This new species was compared with the morphologically similar species A. hainanensis Merrill, A. saccata Wallich and also the recently published new species A. xuanlienensis (Huong et al 2014), A. faviogonzalezii T. V. Do, S. Wanke & C. Neinhuis and A. tonkinensis T.V. Do & S. Wanke from Vietnam (Do et al2015a), according to the descriptions from type specimens and dried herbarium specimens and also literature descriptions (Hwang1988, Hwang et al 2003, Huong et al 2014, Ma 1989, Do et al 2015a, 2015b). Protologues and images of type specimens and dried herbarium specimens were gathered from JSTOR Global Plants (http://plants.jstor.org) and the KUN website (http://db.kun.ac.cn/).…”

“…The genus is also rich in Asia, particularly in eastern and southern Asia, with more than 70 species (Ma 1989; Do et al 2015a). There are currently 61 species recorded in China (Zhu et al 2016, 2017), 22 species in Vietnam (Do and Nghiem 2017) and 12 species in Myanmar (Kress et al 2003).…”

“…subgenus Aristolochia, subgenus Siphisia and subgenus Pararistolochia (Wanke et al 2006). The distribution and key morphological characters of the subgenus Siphisia have been described and discussed by González et al (2014) and Do et al (2015a, 2015b). …”

Cayratia cheniana (Vitaceae): An Endangered New Species Endemic to the Limestone Mountains of Ninh Thuan Province, Vietnam

“…New species of Cayratia as well as new generic records of Yua (Dang et al 2016) and our discoveries of Cyphostemma showcase the importance of continued field collection and taxonomic work in poorly explored regions in the new age of discovery (SA2000 1994; Wen et al 2015a), especially during preparation of the Flora of Vietnam, which includes many novelties (e.g. Farjon et al 2002;Wen et al 2007a;Do et al 2015). …”