Etymology Glycyrrhiza comes from the Greek glykys meaning sweet + rhiza a root. The rhizome is licorice flavored. The licorice of commerce comes from Glycyrrhiza glabra, a flowering plant.

Description Rhizome: creeping, branching, slender, to 6 mm diam., licorice flavored, scales lanceolate, brown.
Frond: 75 cm high by 16 cm wide, evergreen, monomorphic, blade/stipe ratio: 2:1.
Stipe: jointed at base, straw-colored, glabrous or scattered with thin light-brown scales, vascular bundles: 3.
Blade: pinnatifid, lanceolate, usually widest near middle, occasionally at or near base, herbaceous, rachis with a row of hairs above, a diagnotic feature, also on the pinnae midrib.
Pinnae: 10 to 20 pair, linear with a long-acuminate tip, to 8 cm, is the most common form, but rounder tips also found; margins fiely serrate or crenate; veins free.
Sori: round, discrete, midway between margin and midrib to nearly marginal; on all but the lowest pinnae of fertile fronds, indusium: absent, sporangia: yellow to brown at maturity, maturity: late fall to spring.

Culture Habitat: cliffs and rocky slopes along coasts, often epiphytic. Distribution: Kamchatka, north to the Aleutians, south to California, disjunct in Idaho. Hardy to -25°C, USDA Zone 5.

Distinctive Characteristics Hairs on the upper side of the rachis are a unique character; no diagnostic photo could be found. P. hesperium is reported as having variable-tasting, but sometimes sweet-tasting rhizomes. P. glycyrrhiza is generally a larger plant than the other two listed western North American species, but this is not a completely reliable character. So, too, with the long-pointed pinnae; when present they are likely diagnostic, but shorter, more rounded apices are also reported.

Synonyms
Polypodium aleuticum A. E. Bobrov
Polypodium falcatum Kellogg
Polypodium occidentale (Hooker) Maxon
Polypodium vulgare Linnaeus subsp. occidentale (Hooker) Hultén
Polypodium vulgare var. falcatum (Kellogg) H. Christ
Polypodium vulgare var. occidentale Hooker