Zostera japonica Asch. & Graebn.

Dwarf eelgrass (en)

Species

Angiosperms > Alismatales > Zosteraceae > Zostera

Characteristics

Herbs, annual, rarely perennial. Rhizomes 0.5--1.5 mm thick; roots 2 at each node. Leaves: sheath open, persistent, 3--5.5 cm, membranous flaps 2; blade to 15 cm ´ 1--1.5 mm, apex obtuse or retuse; veins 3. Generative shoots lateral, mostly unbranched, with 1--5 spathes. Inflorescence: peduncles with adnate portion 20--90 mm, free portion 1.2--3.1 cm; spathes 2--5, sheath 2--4 cm ´ 2--2.5 mm; blade 5--10 cm; spadix lanceolate; staminate flowers 5--7; pistillate flowers 5--8, apex obtuse. Staminate flowers: bracts subtending every flower; pollen sacs 0.5 ´ 0.7 mm. Pistillate flowers: ovary 1.5--2 mm; style 1--2 mm. Fruits ellipsoid, 2.5 mm, beaked.
More
Rhizomes creeping, 0.5-1.5 mm in diam., internodes 0.5-3 cm. Leaves on non-flowering shoots 2-4, linear, 5-35 × 1-2 mm, 3-veined, apex obtuse or retuse; sheaths open, 2-10 cm, margin membranous; auricle obtuse, ca. 0.5 mm; intravaginal squamules 2, lanceolate. Flowering stems 10-30 cm; spathes with flattened stalk, ca. as broad as or narrower than leaves, apex obtuse, mucronate, rarely retuse; spadix with projections. Anthers ca. 2 mm. Ovary ca. as long as style; stigmas subulate. Fruit ellipsoid to narrowly cylindric, ca. 2 mm. Seeds smooth. Fl. and fr. Jun-Sep. 2n = 12.
Life form perennial
Growth form herb
Growth support aquatic
Foliage retention deciduous
Sexuality monoecy
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Root system rhizome
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OctNovDec
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Environment

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Hardiness (USDA) 6-12

Usage

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Cultivation

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Images

Zostera japonica unspecified picture

Distribution

Zostera japonica world distribution map, present in Canada, China, Japan, Korea (Democratic People's Republic of), Taiwan, Province of China, United States of America, and Viet Nam

Conservation status

Zostera japonica threat status: Least Concern

Identifiers

LSID urn:lsid:ipni.org:names:699880-1
WFO ID wfo-0000752313
COL ID 5D8HR
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Nanozostera japonica Zostera americana Nanozostera americana Zostera japonica Zostera japonica subsp. austroasiatica