Contains 3 accepted taxa overall.
Characteristics
Classification
Citation
CERATOPHYLLUM Linnaeus, Sp. Pl. 992. 1753.
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TYPE: Ceratophyllum demersum Linnaeus
Species
| Scientific Name | Common Name | Herbarium Specimens | Status | Photos |
|---|---|---|---|---|
| Ceratophyllum australe | PRICKLY HORNWORT | Native OBL (NWPL) | ||
| Ceratophyllum demersum | COONTAIL | Native OBL (NWPL) | ||
| Ceratophyllum echinatum | SPINY HORNWORT | Native OBL (NWPL) |
Identification Key
1. Forking of largest leaves 1st or 2nd order (rarely 3rd order); leaves coarse-textured, marginal denticles usually strongly raised on broad base of green tissue; achene margin wingless, with 2 basal spines or tubercles, without marginal spines
1. Forking of largest leaves 3rd or 4th order; leaves fine-textured, marginal denticles not raised on broad base of green tissue, sometimes nearly absent; achene margin winged, with 2 basal spines (rarely absent), with (0)2-20 marginal spines
2
2. First leaves of plumule simple; achene body (excluding terminal spine) 3-4.5 mm
2. First leaves of plumule forked; achene body (excluding terminal spine) 4.5-6 mm
Genus Synonyms
| Synonym | Full Citation | Basionym | Type |
|---|---|---|---|
| Dichotophyllum | Dichotophyllum Moench, Methodus 345. 1794. | TYPE: = Ceratophyllum Linnaeus 1753. | |
| Hydroceratophyllon | Hydroceratophyllon Seguier, Pl. Veron. 3: 62. 1754. | TYPE: = Ceratophyllum Linnaeus 1753. | |
| Revatophyllum | Revatophyllum Roehling, Deutschl. Fl., ed. 2. 2: 514. 1812. | TYPE: = Ceratophyllum Linnaeus 1753. |