''Sparganium emersum'' is a species of flowering plant in the
cat-tail family known by the common names European bur-reed
and unbranched bur-reed.
It has a
circumboreal distribution, occurring throughout the northern latitudes of Eurasia and North America. It is an
aquatic plant, growing in shallow water bodies such as ponds and streams. It can become abundant at times. It is a perennial herb producing a floating stem up to 2 meters long. The leaves may be limp and floating or stiff and erect, emerging above the water surface. The leaves are flat and straplike, sometimes with a triangular, keeled base that can help distinguish it from the similar ''
Sparganium angustifolium''. It is
monoecious, individual plants bearing both male and female
inflorescence
An inflorescence is a group or cluster of flowers arranged on a Plant stem, stem that is composed of a main branch or a complicated arrangement of branches. Morphology (biology), Morphologically, it is the modified part of the shoot of sperma ...
s. These are spherical, the male inflorescence a ball of
stamens and the female inflorescence a ball of developing fruits growing beneath the male spheres.
References
External links
Jepson Manual Treatment: ssp. ''emersum''Washington Burke MuseumUBC Botany Photo of the DayPhoto gallery
emersum
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