Sparganium Erectum L. (S. ramosum Hudson, nom. illeg.)

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Abstract
An account of the ecology of Sparganium erectum is given using the normal Biological Flora format. It is a common British native plant found in or by areas of permanent water and can tolerate oligotrophic waters with conductivities as low as K 20 X 10 6< 200, the whole range of eutrophic waters and the oligohalinous with salinities up to 0.21%. It is wind pollinated and no agamospermous or self-incompatibility mechanisms have been found. The seed is highly impervious and germination appears to be fully dependent on dislodging the micropylar plug. The degree of elongation of the cotyledon stalk is controlled by light and depth of water. Light is necessary for the initiation of a geotropic response in the developing seedling.

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