Sparganium emersum
Simple bur-reed ( Sparganium emersum )
The Simple bur-reed ( Sparganium emersum ) is an aquatic plant of the family of cattail plants ( Typhaceae ). The mature seeds form a ball with outwardly peaks. From this seed arrangement, the term " bur reed " is derived.
- 4.1 Literature
- 4.2 Single Sources
Synonyms
Synonyms are:
- Sparganium emersum ssp. fluitans ( Grenier & Godron ) Oberdorfer, nom. inval.
- Sparganium longissimum ( E.M.Fries ) K.Fritsch
- Sparganium simplex W.Hudson, nom. illeg.
- Sparganium simplex var longissimum E.M.Fries
- Sparganium acaule ( Beeby ex Macoun ) Rydb.
- Sparganium chlorocarpum Rydb.
- Sparganium chlorocarpum Rydb. var acaule ( Beeby ex Macoun ) remote.
Description
The Simple bur-reed is a perennial herbaceous plant, usually at the base roots of shallow waters and spreads with a creeping rhizome. Stems and leaves of aquatic plant ( hydrophyte ) grow upright, rarely flutend. The flower stems reach heights of growth between 20 and 50 centimeters. The most basic form of divorce widened and provided with three -edged leaf sheath and distinctly keeled on the back up to the top leaves grow upright stiff. The basal leaves measure up to 50 centimeters in length and 3 to 10 mm width. The soft floating leaves carry on the upper side a projecting median nerve. The leaves are made of a spongy tissue collapsible swimming ( aerenchyma ).
The Simple bur reed is monoecious getrenntgeschlechtig ( monoecious ). The unbranched, rarely provided with a side branch inflorescences bear up four to eight male, including two to five female standing away, globular flower heads in racemose - ähriger arrangement. The inflorescences are interspersed with bright yellow - green bracts. The ovary wear long thread-like scars. Pollination is by wind ( anemophily ), also self-pollination occurs. Blooms from June to July.
The chromosome number is 2n = 30,
Similar Species
Often Sp is emersum with the narrow-leaved bur-reed ( Sp angustifolium Michx. ) Confused. This species has ungekielte, mostly flooding leaves. It has only one to three female and one male to six flower heads. It grows in nutrient-poor bog waters and mountain lakes.
Distribution and location
The Simple bur reed is spread from Europe to Siberia. After he was introduced to North America. He comes from the flat to the hill country before (planar to collin ).
He settled mainly the banks of slow-flowing waters but also standing waters such as ditches and ponds on base-and more or less nitrate-rich, often calcareous, well - poor, humus-rich mud or Muddeböden. Sparganium emersum is a Kennart the plant community ( association ) of the arrowhead - reeds ( Sagittario Sparganietum emersi ).