from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of several submerged plants of the genus Ceratophyllum, forming branched masses in quiet water and having finely dissected, whorled leaves and minute unisexual flowers.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A bryophyte with a leafless thallus characterized by a dominant gametophyte stage of the life cycle and a sporophyte stage shaped like a horn.
from the GNU version of the Collaborative International Dictionary of English
- n. An aquatic plant (Ceratophyllum), with finely divided leaves.
from The Century Dictionary and Cyclopedia
- n. An aquatic plant of the genus Ceratophyllum, the single species of which, C. demersum, is common in ponds and slow streams in most parts of the world. See cut under Ceratophyllaceæ.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. liverworts with slender hornlike capsules
- n. any aquatic plant of the genus Ceratophyllum; forms submerged masses in ponds and slow-flowing streams
Even so, I bought the hornwort and three white clouds and went home.
Other good kinds are hornwort, water starwort, tape grass, water poppy, milfoil, willow moss, and floating plants like duckweed.
In quiet fresh-water streams, and especially in ponds, there are _Myriophyllums_ (or water-milfoil), _Ceratophyllums_ (or hornwort), the aquatic
Grass, milfoil, water crowfoot, hornwort, starwort, horsetail, and a dozen other delicate plants, form one tangled forest, denser than those of the Amazon, and more densely peopled likewise.
In B we find remains of some of the same plants which were enumerated as common in the ancient lignite in 3 prime, such as the yellow water-lily and hornwort, together with some freshwater shells which occur in the same fluvio-marine series 3 prime.
Weed fragments were found by NIWA staff in March last year and said they were likely to have arrived on a vessel used in nearby hornwort-infested lakes.
In some anthoceros, the hornwort presents pores in the capsule walls or lacks them.
In a hornwort the sporophytes are erect and needle-like.
Anthocerotales by the U.S. Department of Agriculture Survey of hornwort populations in selected arable fields in the Swiss Plateau Irene Bisang, Luc Lienhard und Ariel Bergamini, unknown publisher, July 2008.
The hornwort plant, is very distinctive and similar to many other bryophyte plants in the way they reproduce.