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Key to PolypodiumView taxon page for Polypodium
(For a list of species in Polypodium, use the above link.) Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots. 1. Leaf blade  Expanded portion of a leaf, petal, or other structure, generally flat but sometimes rolled, cylindric, wavy, or cupped. midrib adaxially glabrous, blade ± membranous to leathery, not fleshy 2. Leaf segment generally < 2.5 cm, generally < 1 cm wide; leaf  Organ arising from a stem, generally composed of a stalk (petiole) and a flat, expanded, green, photosynthetic area (blade); distinguished from a leaflet by the presence in its axil of a bud, branch, thorn, or flower; sometimes with lateral, basal appendages (stipules); either simple (toothed, lobed, or dissected but not divided into leaflets) or compound (divided into leaflets). blade ± membranous to ± thick, not leathery, ± firm, not brittle; sori 1–2.5 mm ..... P. hesperium 2' Leaf segment 2.5–7(10) cm, 0.9–1.8(2.5) cm wide; leaf blade thick, leathery, firm, brittle; sori 2–6 mm ..... P. scouleri 1' Leaf blade midrib adaxially hairy, if glabrous, blade membranous to fleshy, not leathery, often firm 3' Veins free and fused; sori round to generally ovate  Egg-shaped (i.e., widest below the middle) in two dimensions (i.e., in one plane), as a leaf. or oblong  Longer than wide, with nearly parallel sides; wider than linear. 4. Leaf blade deltate  More or less equilaterally triangular, with the corners rounded or not. to ovate, often ± irregular in outline, lower 1–3 segment pairs often >= those above; sori generally ± sunken, round to generally ovate; CCo, SCoRO, SW ..... P. californicum 4' Leaf blade oblong-ovate, ± regular in outline, lower 1–3 segment pairs generally < those above; sori not sunken, ovate to oblong; NW (except NCoRH), CaRF, SN (except s SNF), GV (rare), CW ..... P. calirhiza
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Citation for the whole project: Jepson Flora Project (eds.) . Jepson eFlora, https://ucjeps.berkeley.edu/eflora/ [accessed on ]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on .
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