Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

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  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

PTERIDACEAE

BRAKE FAMILY

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.

ADIANTUM

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.

Native

A. jordanii Müll. Hal.

CALIFORNIA MAIDEN-HAIR


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)

Retrieve Jepson Interchange Index to Plant Names entry for Adiantum jordanii
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