Jepson eFlora: Taxon page
Vascular Plants of California
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Najas marina
HOLLY-LEAVED WATER-NYMPH


Higher Taxonomy
Family: HydrocharitaceaeView DescriptionDichotomous Key
Common Name: WATERWEED FAMILY
Habit: Annual, perennial herb, aquatic, freshwater or marine, glabrous or hairy; monoecious, dioecious, or flowers bisexual. Leaf: basal, alternate, opposite, or whorled, generally sessile, generally +- sheathing at base. Inflorescence: axillary, terminal, or scapose, cyme or flowers 1, subtended by +- sheathing, entire or lobed bract; staminate flowers sometimes deciduous, free-floating. Flower: generally radial; perianth 0 or tube 0 or elongate, peduncle-like in flower; sepals (0)3(4), green; petals (0)3(4), white or not; stamens (0)2--many, generally in 1+ series; ovary inferior, chamber 1 or falsely 6--9, placentas parietal, ovules 1--many, style lobes generally 3, linear, lobed or notched. Fruit: achene or berry-like and dehiscing irregularly, linear to spheric, submersed.
Genera In Family: +- 17 genera, +- 130 species: worldwide; some cultivated for aquaria, others noxious weeds. Note: Ottelia alismoides (L.) Pers. is a possibly extirpated alien.
eFlora Treatment Author: Robert F. Thorne, C. Barre Hellquist & Robert R. Haynes
Scientific Editor: Thomas J. Rosatti.
Genus: NajasView DescriptionDichotomous Key


Habit: Annual, aquatic, submersed, mat-like or not; monoecious or dioecious. Stem: several, often much-branched, slender. Leaf: simple, cauline, +- opposite to +- whorled, sessile; sheath generally wider than, expanded abruptly at junction with blade; blade generally linear, margin entire to coarsely spine-toothed. Inflorescence: axillary; flowers 1--few, clustered, inconspicuous. Staminate Flower: subtended by (0)2 minute involucres, inner membranous, flask-shaped, outer cup-like, tubular, or with free scales; perianth 0; stamen 1, anther opening irregularly, subsessile. Pistillate Flower: generally not subtended by involucres; perianth 0; ovary 1, chamber 1, ovule 1, style short, generally terminal (from center of ovary, fruit top), stigma 2--4-lobed. Fruit: achene-like, fusiform; outer wall thin, +- translucent.
Species In Genus: +- 50 species: +- worldwide. Etymology: (Greek: water nymph) Note: Najas graminea Delile is an agricultural weed.
Reference: Haynes 2000 FNANM 22:77--83
Unabridged Reference: Shaffer-Fehre 1991 Bot J Linn Soc 107:189--209; Haynes 2000 FNANM 22:77--83
Najas marina L.
NATIVE
Habit: Dioecious. Stem: internodes generally prickled. Leaf: margin teeth 8--13 per side, tip acute, with 1 tooth; sheath tip acute. Staminate Flower: 1.7--3 mm; anther chambers 4. Pistillate Flower: 2.5--5.7 mm; stigma 3-lobed. Seed: 1.2--2.2 mm wide, ovate, coat pitted, dull. Chromosomes: 2n=12.
Ecology: Ponds, lakes, marshes, rivers; Elevation: < 1000 m. Bioregional Distribution: NCoR, s SNF, CCo, SCoR, SCo, SnBr, PR, D; Distribution Outside California: to north-central United States, Baja California; Eurasia, Pacific islands. Flowering Time: Jul--Aug
Jepson eFlora Author: Robert F. Thorne, C. Barre Hellquist & Robert R. Haynes
Reference: Haynes 2000 FNANM 22:77--83
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Previous taxon: Najas guadalupensis subsp. guadalupensis
Next taxon: Ottelia

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Botanical illustration including Najas marina

botanical illustration including Najas marina

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Citation for this treatment: Robert F. Thorne, C. Barre Hellquist & Robert R. Haynes 2012, Najas marina, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=34357, accessed on October 18, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on October 18, 2019.

Najas marina
click for enlargement
© 2009 Neal Kramer
Najas marina
click for enlargement
© 2009 Neal Kramer
Najas marina
click for enlargement
© 2009 Neal Kramer

More photos of Najas marina in CalPhotos



Geographic subdivisions for Najas marina:
NCoR, s SNF, CCo, SCoR, SCo, SnBr, PR, D
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).





 

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Data provided by the participants of the  Consortium of California Herbaria.
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All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time.