Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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Robert F. Thorne

Perennial, glabrous, submersed marine aquatic, rhizomed, monoecious or dioecious
Stem flat, leafy, creeping or short with wide, thick base
Leaves alternate, 2-ranked or tufted; sheath open or closed; ligule present; blade long, linear, ribbon-like, tip entire to notched
Inflorescence: spike, axillary, flattened, enclosed by membranous, leaf-like bract; flowers many, 2-rowed on 1 side of axis, each enclosed by translucent, scale-like bractlets or not
Staminate flower: perianth 0; stamen 1, anther 2-chambered; pollen thread-like, < 2 mm
Pistillate flower: perianth 0; ovary 1, chamber 1, ovule 1, style 1, stigmas 2
Fruit: drupe or nutlet
Genera in family: 3 genera, ± 18 species: seacoasts, worldwide except tropical; some species source of food for marine animals, some aboriginal humans.



Monoecious; rhizomes creeping, slender
Stem < 300 cm, leafy
Leaves 30–150 cm, alternate, cauline; blade with 3–7 parallel veins
Inflorescence enclosed by sheath of subtending leaf; staminate flowers alternating with pistillate flowers
Staminate flower: anther sessile
Pistillate flower: ovary tapered to short style
Fruit: nutlet, flask-like, wall translucent
Seed ± 3 mm, 1 mm diam, ± 20-ribbed or smooth, base truncate
Species in genus: 12 species: temp to cold marine waters worldwide
Etymology: (Greek: from ribbon-like leaves)
Reference: [Phillips & Echeverria 1990 Pacific Science 44:130–134]
Important food source for marine animals, some aboriginal humans.


Z. marina L.

Leaf 1.5–12 mm wide; tip generally obtuse
Seed: surface with ± 20–25 longitudinal ridges
Chromosomes: n=6
Ecology: Common. Shallow water, bays, estuaries
Elevation: 0–2 m below mean low tide.
Bioregional distribution: North Coast, Central Coast, South Coast, Channel Islands
Distribution outside California: to Alaska, Baja California
Synonyms: var. latifolia Morong

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bioregional map for ZOSTERA%20marina being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Zostera marina
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Overlay Consortium of California Herbaria specimen data by county on this map
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