DOI: 10.3897/phytokeys.273.169468

Authors: Yifan Wang, Shuai Liao, Sven Landrein, Khang Sinh Nguyen, Joyce G. Onyenedum, Zirui Guo

Abstract: Aristolochia ferox is described as a new species endemic to the Jiuwanshan Mountains, northern Guangxi, China. It is morphologically similar to A. championii, A. quangbinhensis, I. haimingii and A. fangchi in vegetative characters but is readily distinguished by its floral traits, particularly the adaxial calyx limb, which is wholly dark purple and muricate with coarse, fleshy, conical outgrowths. The new species is restricted to a very small geographic range. Field surveys indicate that it is extremely rare, with very small extant populations, and is potentially threatened by ethnobotanical harvesting. Accordingly, it is preliminarily assessed as Critically Endangered (CR C2a(i), D) under the IUCN Red List criteria.

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DOI: 10.3897/phytokeys.254.139616

Authors: Yi-Fan Wang, Zi-Rui Guo, Sven Landrein, Joyce G. Onyenedum, Shuai Liao

Abstract: A self-supporting new species of Aristolochiaceae, Aristolochia zhuhaiensis Y.Fan Wang & Z.R.Guo, is described and illustrated from Zhuhai City, Guangdong Province, China. Morphologically, this species exhibits vegetative characters, including leaf blade shape and growth form, that are similar to Aristolochia thwaitesii Hook., the only other known taxon in Aristolochia subg. Siphisia in Asia that is non-twining and self-supporting, native to southern Guangdong, particularly the Hong Kong Special Administrative Region. However, A. zhuhaiensis can be readily distinguished from A. thwaitesii by its unique floral morphology. The new species features a campanulate to funnel-shaped calyx limb densely covered with porcelain-white granular pustules. In contrast, A. thwaitesii has an elongated, concave tubular calyx limb with an adaxial surface that transitions from purple to pale yellow or white towards the apex, densely covered with recurved fleshy prickles. Aristolochia zhuhaiensis is endemic to Zhuhai City and has not been observed elsewhere. Detailed illustrations, photographic plates, a distribution map, a digitized holotype voucher specimen, a comparative table, and an identification key are provided to facilitate the differentiation of A. zhuhaiensis from A. thwaitesii.

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DOI: 10.3897/phytokeys.197.73596

Authors: Quoc Binh Nguyen, Hieu Cuong Nguyen, Duc Binh Tran, Phuong Hanh Nguyen, Hong Truong Luu

Abstract: Isotrema putalengense Luu, Q.B.Nguyen & H.C.Nguyen is described as a new species from northern Vietnam. It looks most morphologically like I. wardianum but is distinguishable by a combination of different leafy and floral characters. Morphological comparison between the new plant and closest species is provided. In addition, combinations of two recently described Aristolochia species are made, namely Isotrema vuquangense (T.V.Do) Luu, Q.B.Nguyen & H.C.Nguyen and Isotrema yachangense (B.G.Huang, Yan Liu & Y.S.Huang) Luu, Q.B.Nguyen & H.C.Nguyen.

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DOI: 10.3897/phytokeys.186.63543

Authors: Jun Wang, Guo-Dong Li, Juan-Juan Yang, Bin Shen, Chun-Xia Pu, Xin-Xin Zhu

Abstract: Isotrema pseudohei, a new species from Yunnan, Southwest China, is described and illustrated. It is morphologically similar to I. hei and I. moupinense, but differs from the former in the colour of flower and throat, the size of throat and the shape of gynostemium lobes, and from the latter in the shape of lamina and gynostemium lobes.

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DOI: 10.3897/phytokeys.153.52796

Authors: Ya Jin Luo, Shi Dong Ni, Qiang Jiang, Bo Gao Huang, Yan Liu, Yu Song Huang

Abstract: Aristolochia yachangensis B.G.Huang, Yan Liu & Y.S.Huang, a new species from limestone areas in Guangxi, China, is described and illustrated. It is morphologically most similar to A. fangchi Y.C.Wu ex L.D.Chow & S.M.Hwang, A. petelotii O.C. Schmidt and A. championii Merr. & Chun in shape of leaf blade, anther, gynostemium and inflorescence on old woody stems. However, it can be easily distinguished from the latter by shape of inflorescence, length of upper and lower portions of perianth tube, colour of the limb and throat. A table and a key to distinguish the new species from other morphologically similar Aristolochia species are also provided.

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DOI: 10.3897/phytokeys.152.51760

Authors: Jun Wang, Ji-Dong Ya, Cheng Liu, Guang Liu, Feng Cao, Jin-Shuang Ma, Xin-Xin Zhu

Abstract: A new species of Isotrema was recently discovered from Guizhou, China and is here named as I. brevilimbum. It is most similar to I. ovatifolium and I. wardianum, but differs in the morphology of leaves and flowers. A detailed description for the new species, along with line drawings, photographs, as well as morphological comparisons with similar species, are provided. In addition, the distribution of I. wardianum in China is here confirmed.

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DOI: 10.3897/phytokeys.134.37243

Authors: Xin Xin Zhu, Hai Lei Zheng, Jun Wang, Yong Qian Gao, Jin Shuang Ma

Abstract: Isotrema cangshanense X.X.Zhu, H.L.Zheng & J.S.Ma, a new species from western Yunnan, China, is described and illustrated here. It is similar to I. utriforme, I. forrestianum, I. cucurbitoides and I. obliquum The major differences between them are outlined and discussed. A detailed description, along with line drawings, photographs, habitat and distribution, as well as a comparison to morphologically similar species, is also provided. Meanwhile, the new taxon is assessed as Vulnerable (VU D2), according to the IUCN Red List criteria.

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DOI: 10.3897/phytokeys.130.33933

Authors: Xinxin Zhu, Xiaoqin Li, Shuai Liao, Guodong Li, Jinshuang Ma

Abstract: Aristolochia pseudoutriformis X.X.Zhu & J.S.Ma, sp. nov. and A. yangii X.X.Zhu & J.S.Ma, sp. nov., two new species from Yunnan, China, are described and illustrated here. The former is morphologically similar to A. utriformis and A. forrestiana and the latter is similar to A. cucurbitoides and A. forrestiana. According to Ma’s (1989a) classification, both new species belong to Aristolochia subgenus Siphisia on the basis of the 3-lobed gynostemium and oblong anthers that are adnate in pairs, opposite the gynostemium lobes. Meanwhile, the two new species are assessed as Vulnerable (VU D2) according to IUCN Red List criteria.

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DOI: 10.3897/phytokeys.128.35042

Authors: Rongtao Li, Zhiwei Wang, Jun Wang, Xinxin Zhu, Han Xu

Abstract: Isotrema sanyaense R.T.Li, X.X.Zhu & Z.W.Wang, sp. nov., a new species from Hainan island, China, is described and illustrated here. It is morphologically most similar to I. ledongense (Han Xu, Y.D.Li & H.J.Yang) X.X.Zhu, S.Liao & J.S.Ma and I. jianfenglingense (Han Xu, Y.D.Li & H.Q.Chen) X.X.Zhu, S.Liao & J.S.Ma in the shape of leaf, flower, and the yellow to brown villous indumentum of the pedicel, ovary and calyx. However, I. sanyaense can be easily distinguished from the latter two species by its 1–5-flowered cymes, in hanging clusters of 1 to numerous branches, upper calyx tube obviously longer than basal calyx tube, calyx limb discoid, yellow inside, with purple-red stripes and spots, about 13–18 mm in diameter, glabrous, and a throat dark red without spots, 4–6 mm wide.

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DOI: 10.3897/phytokeys.94.21557

Authors: Bin Yang, Hong-Bo Ding, Shi-Shun Zhou, Xinxin Zhu, Ren Li, Mya Bhone Maw, Yun-Hong Tan

Abstract: Aristolochia sinoburmanica Y.H.Tan & B.Yang, a new species of Aristolochiaceae from Putao, Kachin State, Myanmar, is described and illustrated. According to morphology (strongly curved perianth, 3-lobed limb, as well as 3-lobed gynostemium, anthers 6, adnate in 3 pairs to the base of gynostemium, opposite to the lobes), the species belongs to Aristolochia subgenus Siphisia. It is morphologically similar to A. faviogonzalezii, A. hainanensis, A. tonkinensis, A. saccata and A. xuanlienensis. The major differences between them are outlined and discussed. A detailed description, along with line drawings, photographs, habitat, distribution and conservation status, as well as a comparison to morphologically similar species, are also provided.

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