Giant bur reed (Sparganium stoloniferum stoloniferum)
Description
Stems emersed, erect, robust, 70-120 cm tall or more. Leaves (20-)40-90 cm � 7-16 mm, upper flattened, lower keeled or trigonous on abaxial side. Panicles (8-)20-60 cm, with 3-7 lateral branches, each with (1 or)7-11 male heads and 1 or 2 female heads; main axis consisting of 3-5 or more male heads. Male flowers: perianth segments spatulate, lobate at apex; filaments ca. 3 mm; anthers obconic, (0.5-)1-1.2 � ca. 0.5 mm. Female flowers: perianth segments 5-7 � 1-1.5 mm; ovary sessile; styles forked or simple, ca. 1.5 mm; stigmas 3-4 mm. Fruit obconic, (3.5-)6-9 mm, ribbed. Fl. and fr. May-Oct.
Taxonomic tree
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Domain: Eukarya
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Kingdom: Plantae
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Phylum:
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Class: Liliopsida
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Order: Poales
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Family: Typhaceae
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Genus: Sparganium
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