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20. Polystichum sect. Cyrtogonellum (Ching) Li Bing Zhang
[comb. et stat. nov.]
柳叶耳蕨组 liu ye er jue zu
Basionym: Cyrtogonellum Ching, Bull. Fan Mem. Inst. Biol., Bot. 8: 327. 1938.
Plants medium-sized. Lamina leathery, 1-pinnate. Rachis without proliferous bulbils. Pinnae falcate-lanceolate or obliquely oblong, length more than 3 × width or only ca. 1.5 × width, symmetrical or nearly symmetrical, rarely asymmetrical at base. Venation free, rarely anastomosing to form 1 or 2 rows of areoles. Sori in 1 row on each side of midrib.
About five species and one hybrid: S China and N Vietnam; five species and one hybrid (three species and one hybrid endemic) in China.
Polystichum sect. Cyrtogonellum is defined based on morphology but is possibly not monophyletic (Zhang & He, Syst. Bot. 35: 13-19. 2010).
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| 1 |
Lamina imparipinnate and with apical pinna of same shape as lateral pinnae |
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(2) |
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Lamina pinnate and with pinnatifid apex |
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(3) |
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| 2 (1) |
Pinnae 13-24 pairs, obliquely ovate; veins free. |
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147 P. minimum |
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Pinnae fewer than 8(-10) pairs, lanceolate; veins with few areoles along midrib. |
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148 P. fraxinellum |
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| 3 (1) |
Pinnae fewer than 8 pairs; veins with few areoles along midrib. |
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149 Polystichum ×rupestris |
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Pinnae obviously more than 10 pairs; veins free |
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(4) |
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| 4 (3) |
Pinnae narrowly lanceolate, symmetrical or nearly symmetrical at base. |
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150 P. tenuius |
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Pinnae obliquely deltoid-falcate or falcate-lanceolate, obviously asymmetrical at base |
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(5) |
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| 5 (4) |
Pinnae fewer than 20 pairs, falcate-lanceolate, 3.5-5 cm. |
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151 P. simile |
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Pinnae ca. 30 pairs, obliquely deltoid-falcate, shorter than 2.5 cm. |
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152 P. xichouense |
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Lower Taxa
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