The taxonomic revision of Asian Aristolochia (Aristolochiaceae) III: Two new taxa of Aristolochia and morphological revision for the flower character of A. obliqua from Yunnan, China

Abstract

In this paper, Aristolochia involuta and A. hainanensis subsp. yingjiangensis, two new taxa from Yunnan, China, are described and illustrated. The former is similar to A. bambusifolia in the calyx limb, but differs in the flower size and leaf shape. The latter differs from A. hainanensis by its leaf shape, fruit size and distribution. And we also clarify the flower character of Aristolochia obliqua.

Taxonomic studies on the genus Isotrema (Aristolochiaceae) from China: II. I. brevilimbum (Aristolochiaceae), a new species from Guizhou, China

“…It can be distinguished from Aristolochia by the follow-ing set of characters: perianth strongly curved, gynostemium 3-lobed, anthers paired on the outer surface of each gynostemium segment, and capsule dehiscing basipetally (Do et al 2015a;Zhu et al 2019a). Several new species of Isotrema have been found and described from China and its neighbouring countries during recent years (Liu and Deng 2009;Xu et al 2011;Yao 2012;Huang et al 2013Huang et al , 2015Wu et al 2013Wu et al , 2015Do et al 2014Do et al , 2015aDo et al , 2015bDo et al , 2015cDo et al , 2015dDo et al , 2016Do et al , 2019Huong et al 2014;Lu and Wang 2014;Ohi-Toma et al 2014;Zhu et al 2015Zhu et al , 2016Zhu et al , 2017aZhu et al , 2017bZhu et al , 2018Zhu et al , 2019bZhu et al , 2019cGong et al 2018;Yang et al 2018;Li et al 2019;Peng et al 2019;Zhou et al 2019;Cai et al 2020aCai et al , 2020b. Currently, a total of 106 species have been reported from Isotrema, most of which are distributed in eastern and southern Asia, with some species further extended to northern and central America (Zhu et al 2019a).…”

The taxonomic revision of Asian Aristolochia (Aristolochiaceae) V: two new species from Yunnan, China

“…Both two new species with horseshoe-shaped perianth, the 3-lobed gynostemium and each lobe consisting of one pair oblong stamens belongs to Aristolochia subgenus Siphisia (Ma 1989a). These new discoveries, along with many new species recently described from China and neighbouring countries (Phuphathanaphong 2006; Liu and Deng 2009; Xu et al 2011; Yao 2012; Huang et al 2013, 2015; Wu et al 2013; Do et al 2014, 2015a, 2015b, 2015c, 2015d, 2017; Huong et al 2014; Lu and Wang 2014; Ohi-Toma et al 2014; Ravikumar et al 2014; Zhu et al 2015, 2016, 2017a, 2017b, 2018; Gong et al 2018; Yang et al 2018) provide evidence that the genus Aristolochia and especially Aristolochia subgenus Siphisia is very diverse in South-East Asia. We predict that more new species of Aristolochia will be found after extensive investigations in this region.…”

Isotrema sanyaense, a new species of Aristolochiaceae from Hainan, China

“…Isotrema sanyaense can also be easily distinguished from I. jianfenglingense by the inflorescence (cymes 1–5-flowered, in hanging clusters of 1 to numerous branches vs. solitary), the calyx (white with purple-red stripes vs. light red to brown without stripes), the calyx limb (discoid, yellow, with purple-red stripes and spots, lobes without papillae and pubescent vs. trumpet-shaped, pink, without stripes and spots, lobes densely papillae and pubescent), and the throat (dark red without spots, significantly smaller than the limb width vs. pink with red-brown spots, approximately to the limb width) (summarized in Table 1). Considering the discovery of this new species from Hainan island, along with the species previously described in China, Myanmar, Peninsular Malaysia, Thailand and Vietnam in recent years (González and Poncy 1999, Phuphathanaphong 2006, Hansen and Phuphathanaphong 2009, Liu and Deng 2009, Xu et al 2011, Yao 2012, Huang et al 2013, 2015, Wu et al 2013, 2015, Do et al 2014, 2015a, 2015b, 2015c, 2015d, 2017, 2019, Huong et al 2014, Lu and Wang 2014, Ohi-Toma et al 2014, Ravikumar et al 2014, Zhu et al 2015, 2016, 2017a, 2017b, 2018, Gong et al 2018, Yang et al 2018, Zhou et al 2019), we predict that more and more new species of Isotrema will be found after extensive investigations and studies.…”

“…Flowering and fruiting branches were pressed to specimens and deposited in the CSH and KUN herbaria (herbarium acronyms follow Thiers 2019). The comparison among similar species was based on extensive revision of specimens (including types) of Isotrema in A, BM, BR, CDBI, CSFI, CSH, E, EMA, GXMI, HAST, HENU, HHBG, HIB, HITBC, HNWP, IBK, IBSC, K, KUN, KYO, L, LBG, LE, NAS, NTUF, P, PE, PEM, SM, SNU, SYS, TAI, TI, W, WCU, WU, WUK, XYTC and YUKU herbaria, as well as related literature (Cheng et al 1988, Ma 1989a, 1989b, Hwang et al 2003, Ohi-Toma et al 2006, Xu et al 2011, Do et al 2015a, 2015b, Ohi-Toma and Murata 2016, Zhu et al 2016, 2017a, 2017b, 2018, Gong et al 2018, Yang et al 2018).…”