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Key to families | Table of families and genera

Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.

 

ZOSTERACEAE EEL-GRASS FAMILY

Robert F. Thorne, Robert R. Haynes, C. Barre Hellquist & Gordon Leppig


Perennial herb (annual), submersed marine aquatic, rhizomed, glabrous; monoecious or dioecious. Stem: flat, leafy, creeping or short with wide, thick base. Leaf: alternate, 2-ranked or tufted, < 2 m; sheath open or closed; blade linear, ribbon-like, tip entire to notched; stipules 0. Inflorescence: axillary or terminal spike, of limited distribution on plant, ± flat, enclosed by membranous, leaf-like bract in flower, also in fruit or not; flowers many, 2-rowed on 1 side of axis, each embedded in axis, enclosed by translucent, scale-like bract or not; peduncle not elongating. Staminate flower: perianth 0; stamen 1, anther generally sessile, 2-chambered; pollen thread-like, < 2 mm. Pistillate flower: perianth 0; ovary 1, chamber 1, ovule 1, style 1, stigmas 2. Fruit: ± achene.
3 genera, ± 18 species: seacoasts, worldwide; some species, especially Zostera marina, source of food for marine animals, some aboriginal humans. [Haynes 2000 FNANM 22:90–94] —Scientific Editor: Thomas J. Rosatti.

Key to Zosteraceae

1. Dioecious; attached by short, tuber-like rhizomes; to coastal, wave-swept rocks; leaves generally tufted on rhizomes at nodes; fruit beaked, base with 2 horn-like lobes ..... PHYLLOSPADIX

1' Monoecious; attached by long, slender, creeping rhizomes to bottoms of bays, estuaries, generally deep waters below wave action; leaves not tufted on rhizomes; fruit ± not beaked, base ± truncate, unlobed ..... ZOSTERA

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Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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