New Taxa
The newest published taxa and newest record of Gesneriaceae from China before 31 December 2019 (1)


No.1 XIN HONG, Jeremy Keene, ZHI-JING QIU & FANG WEN*

 

Primulina anisocymosa (Gesneriaceae), a new species with a unique inflorescence structure from Guangdong, China

PeerJ 7:e6157 https://doi.org/10.7717/peerj.6157

 


ABSTRACT

A new Primulina species from Guangdong, China with an unusual inflorescence is described here. Primulina anisocymosa is vegetatively most similar to P. bobaiensis. It can be distinguished from all species within Primulina morphologically by its unique zigzag monochasial cyme and infructescence. To confirm the phylogenetic relationships and generic placement of this species, not only morphological anatomical features but also chromosome and DNA sequence data were examined and analysed here. Two samples from different populations identified as Primulina anisocymosa are monophyletic and were nested in a monophyletic clade within Primulina with high branch support. The somatic chromosome number of the new species is also reported (2n D 36), supporting its placement in the genus.

    Original article linkhttps://peerj.com/articles/6157

   

图 1 涉及异序报春苣苔的系统发育树

Figure 1 Molecular result showing two populations ofthis new species was strongly supported in a clade, and fell deeply nested in amonophyletic PrimulinaBayesian inference tree focusing on Primulina inferred fromcombined trnL-FCITS data, Bayesian posterior probabilities values less than 1.00 are labeledalong branches, all other nodes had PP values of 1.00. (GZ: typelocality, Gaozhou city; YC: Yangchun city).




图 2 异序报春苣苔中期体细胞染色体.

Figure 2 Somatic chromosomes at metaphase of PrimulinaanisocymosaSomaticchromosomes at metaphase of Primulina anisocymosa (2D 36, fromthe leaf cuttings). (A–C). Microphotograph from different cells (A, B:Gangzhou, E: Yangchun). D, E: Photomicrographs of mitotic metaphase chromosomes(D: Gaozhou, E: Yangchun). Photos by Ms. Sun-Lan Yin.




图 3 异序报春苣苔墨线图

Figure 3 Line-drawingof Primulina anisocymosaPrimulina anisocymosa F. Wen, Xin Hong & Z.J. Qiu. (A) Plantin flower. (B) Corolla opened showing stamens and staminodes. (C) Calyx andpistil with ovary, style and stigma. (D) Seed. —Drawn by Ms. Xiao-Ming Xu andMs. Wen Ma.



 

图 4自然栖息地中两个种群异序报春苣苔的照片.

Figure 4 Photos of Primulina anisocymosa twopopulations in natural habitat. Primulina anisocymosa F. Wen, Xin Hong & Z.J. Qiu) (A, B) Habitat (A, Gaozhou; B,Yangchun) (C, D) Vegetative part of plants (C, Yangchun; D, Gaozhou) (E)Bracteoles, showing not-paired, aligned on one side at the base of pedicel. (F)Cymule, reduced to the point attachment and forming swollen nodules at thebase. (G) Zigzag monochasial infructescence. Photos by Fang Wen





图 5 异序报春苣苔和博白报春苣苔的对比.

Figure 5 Comparison of Primulinaanisocymosa and P. bobaiensisComparison of Primulina anisocymosa and P. bobaiensis,(A) Habit of P. anisocymosa when in flower. (B) A. Habit of P.bobaiensis when in flower. (C) Adaxial leaf blades (left: P. bobaiensis,right: P. anisocymosa). (D) Abaxial leaf blades (left: P. bobaiensis,right: P. anisocymosa). (E) Cymes (upper: P. anisocymosa, lower: P.bobaiensis). (F) Bracts (left: P. anisocymosa, right: P.bobaiensis). (G) Frontal view of corolla of P. anisocymosa. (H)Frontal view of corolla of P. bobaiensis. (I) Top view of corolla (left:P. anisocymosa, right: P. bobaiensis). (J) Lateral view ofcorolla of P. anisocymosa. (K) Lateral view of corolla of P.bobaiensis. (L) Opened corolla of P. anisocymosa. (M) Opened corollaof P. bobaiensis. (N) Pistils without corolla (left: P. anisocymosa,right: P. bobaiensis). Photoed by Xin Hong and Fang Wen.

 

 


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