taxonID	type	description	language	source
170BBC0E92DF58BFAB5C28E83D80401E.taxon	materials_examined	Type. China. Yunnan: Yangbi County, The Cangshan Mountain, Sancha River, 25 ° 41 ' 49 " N, 100 ° 02 ' 55 " E, 2239 m a. s. l., 23 April 2019, X. X. Zhu et al. ZXX 19353 (holotype: CSH [CSH- 0164770!]; isotypes: CSH!, KUN!).	en	Zhu, Xin Xin, Zheng, Hai Lei, Wang, Jun, Gao, Yong Qian, Ma, Jin Shuang (2019): Taxonomic studies on the genus Isotrema (Aristolochiaceae) from China: I. I. cangshanense, a new species from Yunnan. PhytoKeys 134: 115-124, DOI: http://dx.doi.org/10.3897/phytokeys.134.37243, URL: http://dx.doi.org/10.3897/phytokeys.134.37243
170BBC0E92DF58BFAB5C28E83D80401E.taxon	diagnosis	Diagnosis. Isotrema cangshanense is morphologically similar to Isotrema utriforme (S. M. Hwang) X. X. Zhu, S. Liao & J. S. Ma, I. forrestianum (J. S. Ma) X. X. Zhu, S. Liao & J. S. Ma, I. cucurbitoides (C. F. Liang) X. X. Zhu, S. Liao & J. S. Ma and I. obliquum (S. M. Hwang) X. X. Zhu, S. Liao & J. S. Ma (Zhu et al. 2019 a), but is distinguishable from these species by the following diagnostic characters: laminas oblong-lanceolate; calyx outside light yellow; limb narrow-ovoid, 2.4 - 3 x 0.9 - 1 cm, asymmetric, forming an acute angle with the upper part of the tube, 3 - lobed, upper part separated to the middle, lower part shallowly lobed, inside black purple, net-shaped protruding stripes; throat ca. 5 mm in diam. Detailed morphological comparisons are shown in Table 1 and Figure 4.	en	Zhu, Xin Xin, Zheng, Hai Lei, Wang, Jun, Gao, Yong Qian, Ma, Jin Shuang (2019): Taxonomic studies on the genus Isotrema (Aristolochiaceae) from China: I. I. cangshanense, a new species from Yunnan. PhytoKeys 134: 115-124, DOI: http://dx.doi.org/10.3897/phytokeys.134.37243, URL: http://dx.doi.org/10.3897/phytokeys.134.37243
170BBC0E92DF58BFAB5C28E83D80401E.taxon	description	Description. Woody liana. Stems terete, young shoots pubescent. Petioles 0.7 - 3.5 cm long, pubescent to almost glabrous; laminas oblong-lanceolate, 6 - 20 x 1 - 7 cm, adaxially almost glabrous, abaxially villous, base auriculate, sinus 0.7 - 1.8 cm deep, apex acute, margin entire; basal veins 2 - 3 pairs, palmate, 2 - 3 pairs from base, lateral veins 12 - 18 pairs, pinnate. Flowers in axils of leafy shoots or, on older stems, solitary or in fascicles, each fascicle with 2 - 6 flowers; pedicels 1.5 - 4 cm, pubescent partly villous; bracteole 1, lanceolate, 2 - 5 x 1 - 2 mm, adaxially glabrous, abaxially densely villous, inserted below the middle of pedicel. Calyx tube geniculately curved, outside light yellow, abaxially sparsely pubescent partly villous; basal tube 1.8 - 2.5 x 0.5 - 0.6 cm, inside black purple, densely villous at base; upper tube 1.3 - 1.6 x 0.6 - 0.8 cm, inside black purple at base, light yellow towards apex, light red at upper part; limb saccate, narrow-ovoid, asymmetric, forming acute angle with upper part of the tube, 2.5 - 3 x 0.7 - 0.8 cm, 3 - lobed, upper part separated to the middle, lower part shallowly lobed, upper two lobes triangular-lanceolate, 1.2 - 1.5 x 0.4 - 0.5 cm, lower lobe triangle, 0.4 - 0.7 x 0.4 - 0.5 cm, inside black purple, net-shaped protruding stripes; throat ca. 5 mm in diam. Anthers 6, oblong, ca. 1.5 mm long, adnate in 3 pairs to base of gynostemium, opposite to lobes. Gynostemium ca. 2.7 x 2.5 mm, 3 - lobed. Ovary terete, ca. 10 mm long, densely villous. Capsule obovate-elliptic, ca. 4.5 x 2 cm. Seeds obovate-elliptic, ca. 5 x 4 mm, not winged, the adaxial surface deeply concave and the abaxial surface convex, both surfaces glabrous.	en	Zhu, Xin Xin, Zheng, Hai Lei, Wang, Jun, Gao, Yong Qian, Ma, Jin Shuang (2019): Taxonomic studies on the genus Isotrema (Aristolochiaceae) from China: I. I. cangshanense, a new species from Yunnan. PhytoKeys 134: 115-124, DOI: http://dx.doi.org/10.3897/phytokeys.134.37243, URL: http://dx.doi.org/10.3897/phytokeys.134.37243
170BBC0E92DF58BFAB5C28E83D80401E.taxon	etymology	Etymology. The specific epithet derives from the type locality, The Cangshan Mountain, Yangbi County, western Yunnan, south-western China. The Chinese name is given as " 苍山关木通 ".	en	Zhu, Xin Xin, Zheng, Hai Lei, Wang, Jun, Gao, Yong Qian, Ma, Jin Shuang (2019): Taxonomic studies on the genus Isotrema (Aristolochiaceae) from China: I. I. cangshanense, a new species from Yunnan. PhytoKeys 134: 115-124, DOI: http://dx.doi.org/10.3897/phytokeys.134.37243, URL: http://dx.doi.org/10.3897/phytokeys.134.37243
170BBC0E92DF58BFAB5C28E83D80401E.taxon	distribution	Distribution and habitat. The new species is currently known only from the Cangshan Mountain, Yangbi County, Yunnan, China. It grows in forests at an elevation between 2239 m and 2379 m, together with Castanopsis sp. (Fagaceae), Disporum sp. (Colchicaceae), Notochaete hamosa Benth. (Lamiaceae), Photinia Lindl. (Rosaceae), Rubus sp. (Rosaceae) etc.	en	Zhu, Xin Xin, Zheng, Hai Lei, Wang, Jun, Gao, Yong Qian, Ma, Jin Shuang (2019): Taxonomic studies on the genus Isotrema (Aristolochiaceae) from China: I. I. cangshanense, a new species from Yunnan. PhytoKeys 134: 115-124, DOI: http://dx.doi.org/10.3897/phytokeys.134.37243, URL: http://dx.doi.org/10.3897/phytokeys.134.37243
170BBC0E92DF58BFAB5C28E83D80401E.taxon	materials_examined	Specimens examined (Paratypes). China. Yunnan: Yangbi County, The Cangshan Mountain, 2300 m a. s. l., 23 April 2019, X. X. Zhu et al. ZXX 19354 (CSH!); the same location, 2379 m a. s. l., 23 April 2019, X. X. Zhu et al. ZXX 19355 (CSH!).	en	Zhu, Xin Xin, Zheng, Hai Lei, Wang, Jun, Gao, Yong Qian, Ma, Jin Shuang (2019): Taxonomic studies on the genus Isotrema (Aristolochiaceae) from China: I. I. cangshanense, a new species from Yunnan. PhytoKeys 134: 115-124, DOI: http://dx.doi.org/10.3897/phytokeys.134.37243, URL: http://dx.doi.org/10.3897/phytokeys.134.37243
