Jepson eFlora: Taxon page
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Thelypteris nevadensis

Higher Taxonomy
Family: ThelypteridaceaeView Description 

Habit: Plants generally in soil; rhizome short- to long-creeping, prostrate to erect, [trunk-like], scales generally hairy, +- brown. Leaf: stipe ×-section at base with 2 crescent-shaped vascular strands fusing into 1 U-shaped strand distally; blade 1[2]-pinnate, generally with needle-like, clear hairs on axes and/or between veins; rachis, costae generally grooved adaxially except between axes; veins free or in regular, net-like pattern. Sporangia: sori on veins, generally round; indusia reniform or round-reniform [0]; stalk cells in 3 rows; spores generally elliptic, scar generally linear.
Genera In Family: 1 genus (5--32 genera), +- 1000 species: worldwide, especially tropics; several cultivated.
eFlora Treatment Author: John C. Game, Alan R. Smith & Thomas Lemieux
Scientific Editor: Alan R. Smith, Thomas J. Rosatti.
Genus: ThelypterisView DescriptionDichotomous Key

Leaf: pinnae entire to generally deeply lobed, veins generally not forked.
Etymology: (Greek: female fern; ancient name for delicate fern)

Thelypteris nevadensis (Baker) C.V. Morton
Habit: Rhizome creeping, 1.5--3 mm wide; generally dormant in winter. Leaf: densely clustered, generally 40--100 cm, 8--15 cm wide; stipe scales ovate, tan, persistent; blade thin, abaxially with many short-stalked or sessile, resinous glands between and on veins, nonglandular hairs sparse on axes, veins, 0 between veins; pinnae deeply lobed, lobes +- oblong, entire to shallowly crenate. Sporangia: sori small, round; indusia hairs 0 or sparse.
Ecology: Springy hillsides, seepage areas; Elevation: 365--1700 m. Bioregional Distribution: KR, NCoRO, n SNH; Distribution Outside California: to British Columbia, Idaho. Note: Locally forming large colonies. Differs from Athyrium filix-femina in having longer, thinner rhizome, thinner leaves, more numerous reduced proximal pinnae, more entire lobes, rounder sori.
Synonyms: Lastrea oregana (C. Chr.) Copel.; Parathelypteris nevadensis (Baker) Holttum
eFlora Treatment Author: John C. Game, Alan R. Smith & Thomas Lemieux
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botanical illustration including Thelypteris nevadensis


Citation for this treatment: John C. Game, Alan R. Smith & Thomas Lemieux 2017. Thelypteris nevadensis, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 25, 2017.

Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora,, accessed on May 25, 2017.

Geographic subdivisions for Thelypteris nevadensis:
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.