Sparganium glomeratum

(Beurling ex Laestadius) L. M. Neuman in C. J. Hartman et al.
in C. J. Hartman et al.,Handb. Skand. Fl., ed. 12: 111. 1889.
Common names: Rubanier aggloméré
Basionym: Sparganium erectum var. glomeratum Beurling ex Laestadius Bihang till Wikström’s Årberättelse, 1850Årsberäatt. Bot. Arbeten Upptäckter 1850(bihang 2): 2. 1853 or 1854
Treatment appears in FNA Volume 22. Treatment on page 275.

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.

Phenology: Flowering summer (Jul–Aug).
Habitat: shallow, quiet, neutral, mesotrophic waters
Elevation: 0–1000 m


V22 491-distribution-map.jpg

Alta., B.C., Nfld. and Labr. (Labr.), Ont., Que., Sask., Minn., Wis., circumboreal.


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).

Selected References


Lower Taxa


... more about "Sparganium glomeratum"
Robert B. Kaul +
(Beurling ex Laestadius) L. M. Neuman in C. J. Hartman et al. +
Sparganium erectum var. glomeratum +
Rubanier aggloméré +
Alta. +, B.C. +, Nfld. and Labr. (Labr.) +, Ont. +, Que. +, Sask. +, Minn. +, Wis. +  and circumboreal. +
0–1000 m +
shallow, quiet, neutral, mesotrophic waters +
Flowering summer (Jul–Aug). +
in C. J. Hartman et al.,Handb. Skand. Fl., ed. +
Sparganium glomeratum +
Sparganium +
species +