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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.
± 40 genera, 500 species: worldwide, especially dry areas. [Windham 1993 FNANM 2:122–186] Definition of Cheilanthes, related genera problematic; traditional limits often untenable. —Scientific Editors: Alan R. Smith, Thomas J. Rosatti.
Key to Pteridaceae
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.Key to Adiantum
± 200 species: tropics, temperate. (Greek: unwettable) Widely cultivated.
Leaf: 20–50(70+) cm; stipe red-brown to ± black; blade 2–3-pinnate; pinnules cut or lobed often < 1/4 way to base, generally with < 4 ± irregular lobes, margins at base converging at 90–180(240)°, stipe color often ending ± abruptly at base, midvein forked into ± equal branches, not along margin. Sporangia: sori (and false indusia) 1–3(5) per pinnule, generally > 5 mm.
2n=60. Shaded hillsides, moist woodland; < 1200 m. California Floristic Province (except uncommon or absent > 1200 m Cascade Range, High Sierra Nevada); Oregon, Baja California. Cult; sterile hybrids with Adiantum aleuticum (Adiantum ×tracyi W.H. Wagner). [Online Interchange]
Previous taxon: Adiantum capillus-veneris
Next taxon: Argyrochosma
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Apr 16 2014
Citation for this treatment: [Author of taxon treatment] 2012. Adiantum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=11955, accessed on Apr 16 2014
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