No.21 Lan-Ying Su, Bo Pan, Xin Hong, Zhi-Guo Zhao, Long-Fei Fu, Fang Wen, Stephen Maciejewski

Petrocodon jiangxiensis, a new species of Gesneriaceae from the Karst Area of Jiangxi, China

AnnBot  vol. 56 (1-3)

Abstract

Based on morphological, cytological and molecular evidence, a new species of Gesneriaceae, Petrocodon jiangxiensis F.Wen, L.F.Fu & L.Y.Su, is described and illustrated here. This species was discovered from Jiangxi Province, China. Molecular evidence indicates that it most resembles P. asterocalyx, which is congruent with the morphological characters that both of them are similar on axillary cymes, actinomorphic calyx and corolla shape, but can be easily distinguished by leaf blades ovate-elliptic to broadly ovate, bracts 3 and bract margin crenulate to serrate, smaller calyx lobes 5--6 × ca. 1 mm, smaller corolla 1.7--2.3 cm long, and anthers glabrous. P. jiangxiensis has a 2n = 36 somatic chromosome number. 

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Notes: Only ABSTRACT and the first page of article are available at present.

Fig. 1. Somatic chromosomes at metaphase of Petrocodon jiangxiensis (2n = 36). — A, B and C are from different cells.

Fig. 2. Strict consensus tree resulted from a Maximum-parsimony (MP) analysis based on combined trnL-F and ITS sequences of 26 species. Bootstrap values > 50% by MP analysis are shown around the corresponding nodes. The star indicates the new species.

Fig. 3. Petrocodon jiangxiensis. — A and B: Habit of flowering plant in native habitat. — C: Fruits. — D: Bracts. — E: Adaxial leaf surface. — F: Abaxial leaf surface. — G: Inflorescence. — H: Stamens. — I: Calyx and pistil. — J: Opened corolla for showing stamens and staminode. — K: Flower in lateral view. — L: Flower in front view.