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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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TYPHACEAE

CATTAIL FAMILY

Perennial from long rhizomes, colonial, glabrous, generally aquatic (submersed to emergent), monoecious
Stem erect and stiff or submersed and floating above, cylindric, solid
Leaves basal and cauline, alternate, ± 2-ranked, spongy or stiff; sheath open; blade linear, flat, keeled, or triangular in X -section, spongy
Inflorescence spike-like (cylindric, dense) or head-like (spheric), terminal or axillary; staminate above pistillate, generally on same axis; flowers subtended by 1, minute bract
Staminate flower: perianth parts 0 or 1–6 and scale-like; stamens 1–8
Pistillate flower: perianth parts 0 or 1–6 and flattened; ovary 1, chambers 1–2(3), ovules 1–2(3)
Fruit: achene; wall thin, splitting in water
Genera in family: 2 genera, ± 25 species: worldwide. Sparganium formerly treated in Sparganiaceae. Family description and key to genera by R.F. Thorne.

SPARGANIUM

BUR-REED

Robert F. Thorne

Perennial from slender or corm-like rhizomes, glabrous, aquatic (submersed or emergent)
Stem slender, cylindric, solid; upper part erect or floating
Leaf: blade long, flat, keeled, or triangular, sometimes floating, spongy
Inflorescence head-like, spheric, axillary and terminal, sessile or short-peduncled; bracts leaf-like, gradually reduced upward; flowers sessile, each generally subtended by 1 bractlet
Staminate flower: perianth parts 1–6, scale-like; stamens 1–8, filaments free or fused at base
Pistillate flower: perianth parts 1–6, oblanceolate to spoon-like, greenish, persistent in fruit; ovary superior, chambers 1–2(3), ovule 1 per chamber, styles 1 or deeply 2(3)-lobed
Fruit fusiform to obconic, sessile or stalked; top tapered, truncate, or dome-like, beaked or not
Species in genus: 14 species: n temp, se Asia, sw Pacific
Etymology: (Greek: swaddling band, from long, narrow leaves)
Reference: [Cook & Nicholls 1986–7, Bot Helv 96:213–267;97:1–44]

Native

S. emersum Rehmann subsp. emersum

Plant generally emergent
Stem 2–5(8) dm, erect, simple
Leaf 2–6(8) dm, 4–10 mm wide, keeled or triangular below middle (submersed leaves < 22 dm, < 18 mm wide, flat or slightly keeled)
Staminate inflorescences generally 4–7, well separated
Pistillate inflorescences generally 3–4, 12–20(25) mm diam in fruit; lowest on separate peduncle
Fruit 3.5–5.5 mm, ± 2–2.5 mm wide, fusiform, slightly narrowed at middle, brown, shiny
Chromosomes: 2n=30
Ecology: Lakes, ponds, marshes, streams
Elevation: < 2600 m.
Bioregional distribution: North Coast, Klamath Ranges, Outer North Coast Ranges, High Cascade Range, High Sierra Nevada, San Bernardino Mountains, Modoc Plateau
Distribution outside California: to Alaska, Canada
Another subsp. in Eurasia
Synonyms: S. multipedunculatum (Morong) Rydb.; S. simplex Huds

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bioregional map for SPARGANIUM%20emersum%20subsp.%20emersum being generated
 
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Retrieve Jepson Interchange Index to Plant Names entry for Sparganium emersum subsp. emersum
Retrieve dichotomous key for Sparganium
Overlay Consortium of California Herbaria specimen data by county on this map
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