|University of California, Berkeley|
|Jepson eFlora: Taxon page
Key to families | Table of families and genera
Index to accepted names and synonyms:
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|Family: Dryopteridaceae||View Description||Dichotomous Key|
|Genus: Dryopteris||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Dryopteris expansa (C. Presl) Fraser-Jenk. & Jermy
Leaf: 30--80(100+) cm, 10--30(40) cm wide; stipe generally darker abaxially, scales generally with a dark central stripe; blade broadly deltate, +- 3-pinnate, proximal pinnae > others, sides strongly unequal, basiscopic pinnules > 2 × acroscopic on same pinna, segments deeply pinnately lobed, teeth with bristle-like tips or not, veins generally not into teeth; longest pinnae near base. Chromosomes: 2n=82.
Ecology: Caves, shaded, wooded areas, especially banks of streams; Elevation: < 500 m (1300 m in MP). Bioregional Distribution: NCo, NCoRO, CCo, MP (caves in Lava Beds National Monument); Distribution Outside California: to Alaska, Canada, Rocky Mountains.
Synonyms: Dryopteris assimilis S. Walker
eFlora Treatment Author: Alan R. Smith
Jepson Online Interchange
Previous taxon: Dryopteris arguta
Next taxon: Dryopteris filix-mas
Citation for this treatment: Alan R. Smith 2017. Dryopteris expansa, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=23542, accessed on March 24, 2017.
Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on March 24, 2017.