TREATMENT FROM THE JEPSON MANUAL (1993) |
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©Copyright 1993 by the Regents of the University of California
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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]