Polystichum sect. Cyrtogonellum

Chen, Xiao-Hua, Shu, Jiang-Ping, Xu, Yi-Da, Liu, Hong-Mei, Chen, Li-Jun, He, Jiao, Zheng, Xi-Long & Gu, Yu-Feng, 2025, Polystichum cretaceum (Polystichum sect. Cyrtogonellum, Dryopteridaceae), a new fern from Guangxi, China, Phytotaxa 690 (2), pp. 276-284 : 282

publication ID

https://doi.org/10.11646/phytotaxa.690.2.8

persistent identifier

https://treatment.plazi.org/id/F11787D0-FFBB-0C1D-FF57-FB6CFA7C1A19

treatment provided by

Felipe

scientific name

Polystichum sect. Cyrtogonellum
status

 

Key to species of Polystichum sect. Cyrtogonellum in China

1a Lamina imparipinnate and with apical pinna .....................................................................................................................................2

1b Lamina pinnate and with pinnatifid apex ...........................................................................................................................................4

2a Apical pinna of different shape as lateral pinnae ............................................................................................................ P. cretaceum View in CoL

2b Apical pinna of same shape as lateral pinnae.....................................................................................................................................3

3a Veins free; pinnae 13–24 pairs, obliquely ovate................................................................................................................ P. minimum View in CoL

3b Veins with few areoles along midrib; pinnae fewer than 8(–10) pairs, lanceolate........................................................ P. fraxinellum View in CoL

4a Veins with few areoles along midrib .............................................................................................................................. P. × rupestris

4b Veins free ............................................................................................................................................................................................5

5a Pinnae narrowly lanceolate, symmetrical or nearly symmetrical at base............................................................................. P. tenuius View in CoL

5b Pinnae obliquely deltoid-falcate or falcate-lanceolate, obviously asymmetrical at base ...................................................................6

6a Pinnae fewer than 20 pairs, falcate-lanceolate ....................................................................................................................... P. simile View in CoL

6b Pinnae ca. 30 pairs, obliquely deltoid-falcate................................................................................................................. P. xichouense View in CoL

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