Table 1. Morphological comparisons among Isotrema brevilimbum, I. ovatifolium and I in Taxonomic studies on the genus Isotrema (Aristolochiaceae) from China: II. I. brevilimbum (Aristolochiaceae), a new species from Guizhou, China

Table 1. Morphological comparisons among Isotrema brevilimbum, I. ovatifolium and I. wardianum. These characters were based on field observation, related specimens and literatures (Hwang 1981; Ma 1989a; Huang et al. 2003). CharactersI. brevilimbumI. ovatifoliumI. wardianumLaminalong ovate, 5-13 × 2.5-3.5 cm, abaxially densely villous, base cordateovate, 5-13 × 4-8 cm, abaxially densely villous, base cordatelanceolate, 12-16 × 3-4 cm, abaxially subglabrous or glabrous, base auriculatePerianth limbshort cylinder, forming right angle with upper tube, length nearly equal to width, apex dark purple, opened, ca. 7 mm wide at mouthcylinder, straightly extended from upper tube, length significantly longer than width, apex dark purple, constricted, ca. 1 mm wide at mouthcylinder, forming obtuse angle with upper tube, length significantly longer than width, apex light yellow, constricted, ca. 3 mm wide at mouthPerianth throatca. 4 mm wideca. 2.5 mm wideca. 2 mm wideAnthersca. 1.5 mm longca. 1.5 mm longca. 2 mm longGynostemiumca. 3 mm longca. 3.5 mm longca. 3.5 mm longCapsuleca. 4.5 × 2 cmca. 6 × 2 cmunknownDistributionChina (Guizhou)China (Guizhou, Sichuan, Yunnan)China, Myanmar, India