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| April 2007 at Tsukuba Botanical Garden |
| Family | Dryopteridaceae |
| Scientific name | Polystichum tripteron (Kunze) C. Presl |
| Synonyms | Aspidium tripteron Kunze; Dryoteris triptera (Kunze) O. Kuntze; Ptilopteris triptera (Kunze) Hayata; Polystichum tripteron (Kunze) C. Presl forma subbipinnatum H. Ito; Polystichum tripteron (Kunze) C. Presl forma pedatiforme Akasawa; Polystichum tripteron (Kunze) C. Presl var. simplicissimum Tagawa |
| Common name | (Japanese common name) jyumonji shida [cross-shaped fern] |
| (English common name) trifid holly fern | |
| Distribution | (Japan) Hokkaido, Honshu, Shikoku, Kyushu |
| (Other nations) Russia, Korea, China | |
| Chromosomal number | n=41 (2x) |
| Description | Leaves 20-50cm length. Evergreen or summer green. Perennial plants. |
| Reference | Polystichum tripteron (Kunze) C. Presl |
| Polystichum tripteron (Kunze) C. Presl |
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| April 2007 at Tsukuba Botanical Garden |
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| May 2007 at Ibaraki Prefecture Botanical Garden |
May 2007 at Ibaraki Prefecture Botanical Garden |
May 2007 at Ibaraki Prefecture Botanical Garden |
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| May 2007 at Ibaraki Prefecture Botanical Garden |
May 2007 at Ibaraki Prefecture Botanical Garden |
May 2007 at Ibaraki Prefecture Botanical Garden |
