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Answer for the clue "Constituting the family Ceratophyllaceae hornworts ", 13 letters:
ceratophyllum

Word definitions for ceratophyllum in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Ceratophyllum \Ceratophyllum\ n. the sole genus constituting the family Ceratophyllaceae ; the hornworts. Syn: genus Ceratophyllum .

Wikipedia Word definitions in Wikipedia
Ceratophyllum is a cosmopolitan genus of flowering plants including four accepted species in 2016, commonly found in ponds, marshes, and quiet streams in tropical and in temperate regions. It is the only genus in the family Ceratophyllaceae , itself the ...

Usage examples of ceratophyllum.

From the particulars above given, and remembering in the case of twining plants and of tendrils, how difficult it is not to mistake their bending to all points of the compass for true torsion, we are led to believe that the stems of this Ceratophyllum circumnutate, probably in the shape of narrow ellipses, each completed in about 26 h.

Centrosema, 365 Ceratophyllum demersum, movements of stem, 211 Cereus Landbeckii, its rudimentary cotyledons, 97 -- speciossimus, circumnutation of stem, 206, 207 Cerinthe major, circumnutation of hypocotyl, 49 --, of cotyledons, 49 --, ellipses described by hypocotyls when erect, 107 -- effect of darkness, 124 Chatin, M.