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Scientific name: Ceratophyllum demersum L.
Name acc. to:Gubanov 1996
Herbar:list records    scans available    
Description:Submerged free-floating aquatic herb with slender stem strongly branched in upper part and whorls of finely divided linear leaves. Leaves filiform, 1-2 times dichotomously dissected into sparsely dentate lobes, whorled, 4-12 at a node. Flowers small, solitary, about 2 mm long. Fruit oval, smooth, 4-5 mm long, mostly with 3 long spines.
Comments:Cosmopolitan species distinguished from other subaquatic plants by the whorled, bifid leaves. The species of genus Ceratophyllum are very variable and taxonomically difficult (Cook et al. 1974).
Link to Flora of China:
open map in a new windowtaxon distribution for Ceratophyllum demersum acc. to Geobotanical Regions of Mongolia by Grubov (1955)
Habitat:Lakes, old river beds, river backwaters (Grubov 2001).
Habit (i)general appearance of a plant
Growth form: (i)Herb, shrub, tree or climber.herb (i)Herbaceous, erect plant, up to 2m high, mostly with a leafy shoot; if perennial, shoots die to the ground each season, shoots are not woody
example: Artemisia pectinata

perennial (i)Living for several to many years, as opposed to annual and biennial
Parasite status: (i)Is the plant a half- or full parasite?no parasite/saprophyte (i)Plant fully autonomous, leaves with chlorophyll
example: Most plants, Ranunculus
inherited by family Ceratophyllaceae: no parasite/saprophyte
Water or terrestrial plant: (i)Where do the plants grow?aquatic, submerged (i)Completely submerged water plant, onlys flowers may appear at the surface
example: Zannichellia
inherited by order Ceratophyllales: aquatic, submerged
Leaf (i)expanded, usually photosynthetic organ of a plant (including phylloclades)
Simple or divided leaves: (i)Are the leaves simple or completely divided in several parts? Blade of the leaf entire or (more or less) deeply dissected. Attention: There are various appearances of the leaf margin (from entire to toothed and lobed). Here, we ignore this and ask only for dissections that separate the leaf for more than one third of its length or width, whatever is smaller. Sometimes, it is difficult to tell apart compound leaves from a shoot system with simple leaves: look for stipulae and/or axillary buds at the ground of the leaves: if only some possess these structures, the others are most likely leaflets of a compound leaf.compound (i)Composed of several similar parts
Leaf veination: (i)Arrangement of the main veins of a leaf.pinnate (i)One main vein, several side veins, sometimes inconspicuous
example: Cicerbita
inherited by family Ceratophyllaceae: pinnate
Flower (i)reproductive portion of the plant, consisting of sepals, petals, stamens, and pistils
Flower appearance and pollination: (i)General appearance of the flower.not attractive, wind-pollinated or some water plants (i)Small, colourless or green flowers
example: Betula, grasslike plants: Carex, Setaria, Juncus
inherited by family Ceratophyllaceae: not attractive, wind-pollinated or some water plants
Spur: (i)A hollow, slender, sac-like appendage of the perianth leaves, storing spur (i)Flower without appendage
example: Peganum
inherited by family Ceratophyllaceae: no spur
Root / shoot below ground (i)plant part below ground (in most cases), including below ground shoots, without leaves
Root type: (i)Organisation of the roots.allorhizous (i)Plant with a conspicuous tap root, one larger tap root with side roots
example: Dicotyledonae
inherited by order Ceratophyllales: allorhizous
Distribution (i)region where the plant is likely to be found
Distribution (Veg. Zones): (i)acc. to Grubov 1952Mongol-Daurian (i)In distribution data often named as '4'
Depression of Great Lakes (i)In distribution data often named as '10'
Dzungarian Gobi (i)In distribution data often named as '14'
Distribution Khangay: (i)acc. Flora Khangaya 1989V