Flora of North America species comparison

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Sparganium glomeratum

cluster bur-reed, northern bur-reed, rubanier aggloméré
Habit 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.

Sparganium glomeratum
Phenology Flowering summer (Jul–Aug).
Habitat shallow, quiet, neutral, mesotrophic waters
Elevation 0–1000 m (0–3300 ft)
Distribution
from FNA
MN; WI; AB; BC; LB; ON; QC; SK; circumboreal
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Discussion

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).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 22, p. 275.
Parent taxa Sparganiaceae > Sparganium
Sibling taxa
S. americanum, S. androcladum, S. angustifolium, S. emersum, S. eurycarpum, S. fluctuans, S. hyperboreum, S. natans
Synonyms S. erectum var. glomeratum
Name authority (Beurling ex Laestadius) L. M. Neuman: in C. J. Hartman et al., Handb. Skand. Fl., ed. 12: 111. (1889)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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