| 词条 | Polypodium hesperium |
| 释义 |
| image = Polypodium hesperium 6329.JPG | genus = Polypodium (plant) | species = hesperium | authority = Maxon | synonyms = Polypodium vulgare var. hesperium (Maxon) A.Nelson & J.F.Macbr. }} Polypodium hesperium is a species of fern known by the common name western polypody. It is native to western North America from British Columbia to California, and the Rocky Mountains to northern Mexico, where it grows in rocky habitat types. This is an allopolyploid species of hybrid origin, its parent species being Polypodium glycyrrhiza and Polypodium amorphum. DescriptionThis polypody anchors with a thin, scaly rhizome. It produces oblong leaves 25 to 35 centimeters in maximum length and 7 in width. Each leaf is made up of many dull-pointed linear or lance-shaped segments which may be thin and membranous or firm and leathery in texture, and smooth or serrated on the edges. The underside of each leaf segment has a few brownish, reddish, or nearly black sori, which contain the spores. External links{{Commons category|Polypodium hesperium}}
14 : Polypodium|Ferns of California|Ferns of Mexico|Ferns of the United States|Flora of Northwestern Mexico|Flora of the Northwestern United States|Flora of the Southwestern United States|Flora of the Klamath Mountains|Flora of the Rocky Mountains|Flora of the Sierra Nevada (U.S.)|Natural history of the California Coast Ranges|Natural history of the Transverse Ranges|Pteridophyta of the Americas|Plants described in 1900 |
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