Spreading Woodfern - Dryopteris expansa
State Rank Reason (see State Rank above)
28 collections at MONTU from 9 different counties.
Leaves monomorphic, up to 90 cm long; petiole ca. 1/2 as long as blade. Leaf blade green, narrowly triangular, twice pinnate, glandular or not. Pinnules deeply pinnately lobed, downward pointing ones on lower pinnae longer than those pointing upward. Indusium with or without glands (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
In MT in the western third east to Carbon County; Greenland and Europe, AK to CA, MT and ON to NL (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Observations in Montana Natural Heritage Program Database
Number of Observations:
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(Observations spanning multiple months or years are excluded from time charts)
Mesic, shady forests, often along streams and beneath shrubs; valleys to montane (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
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- Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.