Common name: Hornwort
Ceratophyllum demersum L. APNI*
Description: Submerged unattached, or rarely loosely attached to the sediment, herb with no true roots.
Leaves 1–4 cm long, dissected, usually 2–4 times, the ultimate segments ± cylindrical with small teeth.
Involucral bracts 8–12, linear, 1.5–2 mm long.
Fruit black, 4.5 mm long (excluding spines) with 1 terminal and 2 laterally separated basal spines longer than the fruit; one or both of the basal spines may only partially develop.
Distribution and occurrence: Widespread, in water to 10 m deep, tolerant of low light levels.
NSW subdivisions: NC, CC, *SC, SWS, SWP, SFWP
Other Australian states: Qld Vic. W.A. N.T.
Text by S. W. L. Jacobs
Taxon concept: Flora of NSW 1 (1990)
APNI* Provides a link to the Australian Plant Name Index (hosted by the Australian National Botanic Gardens) for comprehensive bibliographic data
***The AVH map option provides a detailed interactive Australia wide distribution map drawn from collections held by all major Australian herbaria participating in the Australian Virtual Herbarium project.