taxonID	type	description	language	source
1294CE8B7EAE5CB4B27D6D6E5CF76C2D.taxon	materials_examined	Type. China. Guizhou: Weining County, Jinzhong Town, 2226 m alt., 5 Aug 2018, X. X. Zhu et al. ZXX 18217 (holotype: CSH- 0172289!; isotypes: CSH!, KUN!).	en	Wang, Jun, Ya, Ji-Dong, Liu, Cheng, Liu, Guang, Cao, Feng, Ma, Jin-Shuang, Zhu, Xin-Xin (2020): Taxonomic studies on the genus Isotrema (Aristolochiaceae) from China: II. I. brevilimbum (Aristolochiaceae), a new species from Guizhou, China. PhytoKeys 152: 15-25, DOI: http://dx.doi.org/10.3897/phytokeys.152.51760, URL: http://dx.doi.org/10.3897/phytokeys.152.51760
1294CE8B7EAE5CB4B27D6D6E5CF76C2D.taxon	diagnosis	Diagnosis. Isotrema brevilimbum is morphologically similar to I. ovatifolium (S. M. Hwang) X. X. Zhu, S. Liao & J. S. Ma and I. wardianum (J. S. Ma) X. X. Zhu, S. Liao & J. S. Ma, but differs from the former in its lamina long ovate (vs. lamina ovate in I. ovatifolium), perianth limb forming right angle with upper tube, length nearly equal to width, and apex dark purple and opened (vs. limb straightly extended from upper tube, length significantly longer than width, and apex dark purple and constricted in I. ovatifolium), differs from the latter in its lamina long ovate and abaxially densely villous (vs. lamina lanceolate and abaxially subglabrous or glabrous in I. wardianum), perianth limb forming right angle with upper tube, length nearly equal to width, and apex dark purple and opened (vs. limb forming obtuse angle with upper tube, length significantly longer than width, and apex light yellow and constricted in I. wardianum).	en	Wang, Jun, Ya, Ji-Dong, Liu, Cheng, Liu, Guang, Cao, Feng, Ma, Jin-Shuang, Zhu, Xin-Xin (2020): Taxonomic studies on the genus Isotrema (Aristolochiaceae) from China: II. I. brevilimbum (Aristolochiaceae), a new species from Guizhou, China. PhytoKeys 152: 15-25, DOI: http://dx.doi.org/10.3897/phytokeys.152.51760, URL: http://dx.doi.org/10.3897/phytokeys.152.51760
1294CE8B7EAE5CB4B27D6D6E5CF76C2D.taxon	description	Description. Climbing shrubs. Stems terete, densely villous when young, old branchlets glabrous. Petioles 1 - 4 cm long, densely villous; laminas long ovate, 5 - 13 x 2.5 - 3.5 cm, adaxially appressed villous, abaxially densely villous, base cordate, margin entire, apex acute; basal veins palmate, 2 - 3 pairs from base, lateral veins 4 - 6 - paired. Flowers axillary or lateral on young stems, solitary, rarely paired. Pedicels pendulous, 1.5 - 3 cm long, densely villous; bracteole ovate, conduplicate, ca. 2 x 1 mm, abaxially densely villous, adaxially smooth, inserted on lower part of pedicel. Perianth tube geniculately curved, abaxially villous; basal tube ca. 1 cm long, inside dark red, upper tube ca. 1.5 cm long, inside red; limb short cylinder, length nearly equal to width, ca. 7 x 8 mm, forming right angle with upper tube, apex dark purple, opened, ca. 7 mm wide at mouth, inside dark red with densely tiny dark-purple papillae; throat subcircular, ca. 4 mm wide. Anthers 6, oblong, ca. 1.5 mm long, adnate in 3 pairs to base of gynostemium, opposite to lobes. Gynostemium ca. 3 mm long, 3 - lobed. Ovary terete, ca. 8 mm long, densely villous. Capsule cylindric, abaxially densely villous, ca. 4.5 x 2 cm. Seeds ovate, 4 - 5 x 3 - 3.5 mm, concave-convex.	en	Wang, Jun, Ya, Ji-Dong, Liu, Cheng, Liu, Guang, Cao, Feng, Ma, Jin-Shuang, Zhu, Xin-Xin (2020): Taxonomic studies on the genus Isotrema (Aristolochiaceae) from China: II. I. brevilimbum (Aristolochiaceae), a new species from Guizhou, China. PhytoKeys 152: 15-25, DOI: http://dx.doi.org/10.3897/phytokeys.152.51760, URL: http://dx.doi.org/10.3897/phytokeys.152.51760
1294CE8B7EAE5CB4B27D6D6E5CF76C2D.taxon	etymology	Etymology. The specific epithet refers to the short cylinder perianth limb of the new species. The " brevi " means " short ", " limbum " means " limb ", so the new species is named Isotrema brevilimbum.	en	Wang, Jun, Ya, Ji-Dong, Liu, Cheng, Liu, Guang, Cao, Feng, Ma, Jin-Shuang, Zhu, Xin-Xin (2020): Taxonomic studies on the genus Isotrema (Aristolochiaceae) from China: II. I. brevilimbum (Aristolochiaceae), a new species from Guizhou, China. PhytoKeys 152: 15-25, DOI: http://dx.doi.org/10.3897/phytokeys.152.51760, URL: http://dx.doi.org/10.3897/phytokeys.152.51760
1294CE8B7EAE5CB4B27D6D6E5CF76C2D.taxon	distribution	Distribution and habitat. The new species is currently only known from Weining County of Guizhou, China. It grows by the roadside of farmland at an altitude of ca. 2200 m.	en	Wang, Jun, Ya, Ji-Dong, Liu, Cheng, Liu, Guang, Cao, Feng, Ma, Jin-Shuang, Zhu, Xin-Xin (2020): Taxonomic studies on the genus Isotrema (Aristolochiaceae) from China: II. I. brevilimbum (Aristolochiaceae), a new species from Guizhou, China. PhytoKeys 152: 15-25, DOI: http://dx.doi.org/10.3897/phytokeys.152.51760, URL: http://dx.doi.org/10.3897/phytokeys.152.51760
