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Adiantum aleuticum

Higher Taxonomy
Family: PteridaceaeView DescriptionDichotomous Key

Habit: Perennial herb, in soil or on or among rocks; rhizome creeping to erect, scaly. Leaf: generally all +- alike (or of 2 kinds, fertile, sterile), generally < 50 cm, often < 25 cm; stipe generally thin, wiry, often dark, ×-section with vascular strands generally 1--3, less often many in circle; blade generally pinnate or +- palmate-pinnate (see Adiantum), often >= 2-compound, abaxially often with glands, +- powdery exudate, hairs, or scales; segments round, oblong, fan-shaped, or other, veins generally free. Sporangia: in sori or not, marginal, submarginal, or along veins, covered by recurved, often modified segment margins (false indusia) or not; true indusia 0; spores spheric, sides flat or not, scar with 3 radiating branches.
Genera In Family: +- 40 genera, 500 species: worldwide, especially dry areas. Note: CA members of Cheilanthes moved to the distantly related Myriopteris; Pellaea breweri to be moved as well, from a to-be-redefined Pellaea; traditional, often untenable limits of genera outside CA also being clarified using molecular phylogenetics.
eFlora Treatment Author: Ruth E.B. Kirkpatrick, Alan R. Smith & Thomas Lemieux, except as noted
Scientific Editor: Alan R. Smith, Thomas J. Rosatti.
Genus: AdiantumView DescriptionDichotomous Key

Habit: Plant in soil or rock crevices; rhizome short-creeping, scales variously colored. Leaf: < +- 1 m; stipe cylindric, generally dark red-brown to +- black, shiny, +- scaly at base; blade 2--3-pinnate or +- palmate-pinnate (1st division +- palmate, subsequent ones pinnate), pinnae stalked, fan-shaped or oblong, generally lobed, toothed, or both; axes, blades lacking colored exudate. Sporangia: borne along veins on and covered by highly modified, recurved part of segment margin, appearing to run together at maturity; false indusia +- semicircular to linear; spores generally smooth, tan.
Species In Genus: +- 200 species: tropics, temperate. Etymology: (Greek: unwettable) Note: Widely cultivated.

Adiantum aleuticum (Rupr.) C.A. Paris
Leaf: 20--75(100+) cm; stipe red-brown to +- black; blade +- palmate-pinnate; pinnules cut or lobed generally < 1/2 way to midrib, often with > 4 regular lobes, margins at base converging at 45--90°, stipe color extending gradually into base, midvein generally part way along 1 margin. Sporangia: sori (and false indusia) generally 4--6 per pinnule, generally < 3 mm. Chromosomes: 2n=58.
Ecology: Shady, moist banks, streamsides, serpentine; Elevation: < 3400 m. Bioregional Distribution: NW, CaR, SNH, CCo, SnFrB, SCoRO, n ChI, TR, SnJt; Distribution Outside California: to Alaska, western Canada, Montana, Colorado, New Mexico; eastern United States, adjacent Can, northwestern Mexico. Note: Sterile hybrids with Adiantum jordanii (Adiantum ×tracyi W.H. Wagner).
Synonyms: Adiantum pedatum L. subsp. calderi Cody; Adiantum pedatum var. subpumilum W.H. Wagner; Adiantum boreale C. Presl nom. nud.; Adiantum pedatum var. aleuticum Rupr.
eFlora Treatment Author: Ruth E.B. Kirkpatrick, Alan R. Smith & Thomas Lemieux
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botanical illustration including Adiantum aleuticum


Citation for this treatment: Ruth E.B. Kirkpatrick, Alan R. Smith & Thomas Lemieux 2016. Adiantum aleuticum, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 01, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on May 01, 2016.

Adiantum aleuticum
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© 2008 Keir Morse
Adiantum aleuticum
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© 2015 Aaron E. Sims and CNPS
Adiantum aleuticum
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© 2015 Barry Breckling
Adiantum aleuticum
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© 2013 Julie Kierstead Nelson
Adiantum aleuticum
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© 2002 California Academy of Sciences
Adiantum aleuticum
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© 2015 Aaron E. Sims and CNPS

More photos of Adiantum aleuticum in CalPhotos

Geographic subdivisions for Adiantum aleuticum:
NW, CaR, SNH, CCo, SnFrB, SCoRO, n ChI, TR, SnJt;
Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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.