Comments
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Sparganium glomeratum is apparently rare, or perhaps is only rarely collected, in North America, except it is locally common in sedge-marshes and black-ash swamps near the western end of Lake Superior. The species is rather invariable throughout its circumboreal range (C. D. K. Cook and M. S. Nicholls 1986).
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Description
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Plants slender to robust, to 0.4(--0.6) m; at least some leaves and inflorescences emergent, erect. Leaves stiff, weakly keeled, to 50 cm 6 mm. Inflorescences: rachis unbranched, condensed, erect; bracts ascending, somewhat inflated near base; pistillate heads 2--6, mostly supra-axillary, sometimes opposite bract above, upper crowded, sessile, proximal head not contiguous with upperdistal, peduncled, 1.2--1.6(--2) cm diam. and contiguous in fruit; staminate heads 1(--2), contiguous or not with distalmost pistillate head. Flowers: tepals without subapical dark spot, entire to erose; stigma 1, lanceolate. Fruits greenish brown, lustrous, stipitate, fusiform, body not faceted, slightly constricted near equator, 3--6 2--3 mm, tapering to beak; beak straight, 1.5--2 mm; tepals attached at base, reaching 1/3 to 1/2 length of fruit. Seeds 1. 2n = 30.
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Distribution
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Alta., B.C., Nfld. and Labr. (Labr.), Ont., Que., Sask.; Minn., Wis.; circumboreal.
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Flowering/Fruiting
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Flowering summer (Jul--Aug).
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Habitat
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; Sshallow, quiet, neutral, mesotrophic waters; 0--1000m.
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Synonym
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Sparganium erectum Linnaeus var. glomeratum Beurling ex Laestadius, Bihang till Wikström’s Årberättelse, 1850Årsberäatt. Bot. Arbeten Upptäckter 1850(bihang 2): 2. 1853 or 1854
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Sparganium glomeratum: Brief Summary
provided by wikipedia EN
Sparganium glomeratum, the clustered bur-reed, is a species of bur-reed. It is a water plant native to high elevation lakes and marshes of Europe, Asia, and North America. North American populations were doubted as introduced due to its scarce and scattered populations, but a recent herbarium survey found more localities of the species in the central of Canada, concluding the species as circumpolar species.
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