Jepson Flora Project: Jepson Interchange    

link to manual TREATMENT FROM THE JEPSON MANUAL (1993) previous taxon | next taxon
Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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Alan R. Smith and Thomas Lemieux

Perennial, in soil or on or among rocks; rhizome creeping to erect, scaly
Leaves generally all ± alike (or of 2 kinds, fertile and sterile), generally < 50 cm, often < 25 cm; petiole generally thin, wiry, often dark, in transverse section with vascular strands generally 1–3, less often many in a circle; blade generally pinnate or ± palmate-pinnate (see Adiantum ), often 2 or more compound, lower surface often with glands, ± powdery exudate, hairs, or scales; segments round, oblong, fan-shaped, or otherwise, veins generally free
Sporangia in sori or not, marginal, submarginal, or along veins, sometimes covered by recurved, often modified segment margins (false indusia); true indusia 0; spores spheric, sides sometimes flat, scar with 3 radiating branches
Genera in family: ± 40 genera, 500 species: worldwide, especially dry areas. Definition of Cheilanthes and related genera problematic; traditional limits often untenable.


Plant in soil or rock crevices; rhizome short-creeping, scales variously colored
Leaf < ± 1 m; petiole cylindric, generally dark reddish brown to blackish, shiny, ± scaly at base; blade 2–3-pinnate or ± palmate-pinnate (1st division ± palmate, subsequent ones pinnate), segments 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 ± semi-circular to linear; spores generally smooth, tan
Species in genus: ± 200 species: tropical, temp
Etymology: (Greek: unwettable)
Widely cultivated.


A. jordanii Müll. Hal.


Leaf 20–50 (70+) cm; petiole reddish brown to blackish; blade 2–3-pinnate; segments cut or lobed often < 1/4 way to base, generally with < 4 ± irregular lobes, margins at base converging at 90–180°, rarely to 240°, stalk color often ending ± abruptly at base, midvein forked into ± equal branches, not extending along margin
Sporangia: sori and false indusia 1–3, rarely to 5 per segment, generally > 5 mm
Chromosomes: 2n=60
Ecology: Shaded hillsides, moist woods
Elevation: < 1200 m.
Bioregional distribution: California Floristic Province (except uncommon or absent >1200 m in Cascade Range, High Sierra Nevada)
Distribution outside California: Oregon
Cult; forms sterile hybrids with A. aleuticum (A. X tracyi W. Wagner)
Horticultural information: SHD, DRN, DRY: 7, 9, 14, 15, 16, 17; DFCLT.

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bioregional map for ADIANTUM%20jordanii being generated
N.B. The distribution depicted here differs from that given in The Jepson Manual (1993)
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Adiantum jordanii
Retrieve dichotomous key for Adiantum
Overlay Consortium of California Herbaria specimen data by county on this map
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