| TREATMENT FROM THE JEPSON MANUAL (1993) |
previous taxon |
next taxon
Jepson Interchange (more information) |
|
|
©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 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.
Perennial from tough rhizomes, emergent or terrestrial, colonial, glabrous, monoecious
Stems erect, simple, hard
Leaf: sheath open; blade linear, C-shaped in X -section below, flat above
Inflorescence spike-like, terminal, cylindric; staminate flowers above, pistillate flowers below; flowers 1000+, staminate mixed with many papery scales; pistillate pedicels clustered on short, peg-like stalk
Staminate flower: perianth 0; stamens 2–7 on slender stalk; filaments slender, generally deciduous in fruit
Pistillate flowers fertile and sterile; perianth 0; pedicel slender, long-hairy; ovary 1-chambered, ovule 1, style long, thread-like, stigma 1; sterile ovary truncate to rounded
Fruit minute, fusiform, falling with pedicel and hairs; wall thin, splitting in water
Species in genus: ± 8–13 species: worldwide. Rhizomes, pollen of some species used for food; leaves used for caning
Etymology: (Greek: ancient name)
Reference: [Smith 1987 Arch Hydrobiol Beih 27:129–138]
All North America species hybridize.
| Native |
Plants 15–30 dm
Leaf: sheath tapered to blade or shouldered; blade 10–29 mm wide when fresh, (5)10–20 mm wide when dry, glands 0
Inflorescence ± = leaves; naked axis between staminate and pistillate flowers 0 (sometimes 4–8 cm); staminate bractlets simple, hair-like, whitish; pistillate stalk 1.5–3 mm, hair-like, spike 5–25 cm, 28–36 mm wide in fruit, green when fresh, brown in fruit, bractlets 0
Staminate flower: pollen grains in groups of 4
Pistillate flower: stigma widely lanceolate; sterile ovary rounded, << pedicel hairs, hair tips whitish
Chromosomes: n=15
Ecology: Common. Marshes, ponds, lakes
Elevation: < 2000 m.
Bioregional distribution: California
Distribution outside California: temperate N.America, C.America, Eurasia, Africa
Flowering time: Jun–Jul