TREATMENT FROM THE JEPSON MANUAL (1993) |
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©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora. |
AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY |
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 16 and scale-like; stamens 18
Pistillate flower: perianth parts 0 or 16 and flattened; ovary 1, chambers 12(3), ovules 12(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.
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 16, scale-like; stamens 18, filaments free or fused at base
Pistillate flower: perianth parts 16, oblanceolate to spoon-like, greenish, persistent in fruit; ovary superior, chambers 12(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 19867, Bot Helv 96:213267;97:144]
Native |
Plant emergent (sometimes submersed); rhizomes corm-like
Stem 515(26) dm, erect, ± stiff; branches below inflorescence 25
Leaf 510(26) dm, 620 mm wide, ± keeled at base, flat above
Staminate inflorescences 614, well separated
Pistillate inflorescences 12, 2035 mm diam in fruit
Fruit 610 mm, 68 mm wide, wedge-shaped to obconic, ± abruptly narrowed and 3-angled below middle, light brown, sessile; top truncate to low-rounded; beak 24 mm
Chromosomes: 2n=30
Ecology: Pond and lake margins, marshes, streams
Elevation: < 1400 m.
Bioregional distribution: Inner North Coast Ranges, s Sierra Nevada Foothills, Great Central Valley, Central Coast, San Francisco Bay Area, Inner South Coast Ranges, Modoc Plateau
Distribution outside California: to British Columbia, e&s US
Another subsp. in Eurasia