Sp. Pl.2: 992. 175
Gen. Pl. ed.5, 428. 1754
Useful in identification of species of Ceratophyllum are leaf-forking characteristics. Leaves with no forking are "0-order"; they consist only of a primary segment. Those forking once are "1st-order"; their ultimate segments are secondary. Those in which at least one secondary segment forks are "2d-order"; their ultimate segments are tertiary. Those in which at least one tertiary segment forks are "3d-order"; their ultimate segments are quaternary. Those in which at least one quaternary segment forks are "4th order."
Plumule features used in the key below are observable through dissection of softened (soaked) seeds removed from achenes.
Les, D. H. 1986b. The evolution of achene morphology in Ceratophyllum (Ceratophyllaceae), I. Fruit spine variation and relationships of C. demersum, C. submersum, and C. apiculatum. Syst. Bot. 11: 549-558.
|1||Forking of largest leaves 1st or 2d order (rarely 3d order); leaves coarse-textured, marginal denticles usually strongly raised on broad base of green tissue; achene margin wingless, basal spines or tubercles 2 (rarely absent).||Ceratophyllum demersum|
|1||Forking of largest leaves 3d or 4th order; leaves fine-textured, marginal denticles not raised on broad base of green tissue, sometimes nearly absent; achene margin winged, spines (0–)2–20, 0.1–6.5 mm, basal spines 2 (rarely absent).||> 2|
|2||First leaves of plumule simple; achene body (excluding terminal spine) 3–4.5 mm; Florida, Georgia, North Carolina.||Ceratophyllum muricatum|
|2||First leaves of plumule forked; achene body (excluding terminal spine) 4.5–6 mm; widespread in North America.||Ceratophyllum echinatum|
|Author||Donald H. Les +|
|Common name||Hornwort + and cornifle +|
|Etymology||Greek ceratos, horn, and phyllon, leaf +|
|Illustration copyright||Flora of North America Association +|
|Illustrator||John Myers +|
|Publication title||Sp. Pl. + and Gen. Pl. ed. +|
|Publication year||1754 +|
|Reference||fassett1953b +, herendeen1990a +, jones1931a +, les1985a +, les1986a +, les1986b +, les1988b +, les1988c +, les1989a +, lowden1978a + and muenscher1940a +|
|Source xml||https://firstname.lastname@example.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse grained fna xml/V3/V3 139.xml +|
|Taxon family||Ceratophyllaceae +|
|Taxon name||Ceratophyllum +|
|Taxon parent||Ceratophyllaceae +|
|Taxon rank||genus +|
|Volume||Volume 3 +|