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Pilularia americana

Higher Taxonomy
Family: MarsileaceaeView DescriptionDichotomous Key

Common Name: MARSILEA FAMILY
Habit: Plant generally aquatic or in perennially wet areas, generally rooted in mud; rhizome creeping, slender, branched. Leaf: floating, emergent, or out of water, +- alike; blade 1-palmate or 0, << stipe; veins not or repeatedly forked, free or netted. Sporangia: in stalked, spheric or +- flat-ovoid, hard cases of 1 kind, attached near stipe base. Spores: large megaspores (female) and small microspores (male), in separate sporangia.
Genera In Family: 3 genera, +- 70 species: especially temperate.
eFlora Treatment Author: Andy Murdock, Alan R. Smith & Thomas Lemieux
Scientific Editor: Alan R. Smith, Bruce G. Baldwin.
Genus: PilulariaView Description 

Habit: Aquatic, submerged or in mud, forming dense clumps. Sporangium Case: subterranean, fused to stalk tip, spheric, hairy; teeth 0.
Species In Genus: +- 6 species: generally temperate. Etymology: (Latin: little ball, from sporangium case)

Pilularia americana A. Braun
NATIVE
Leaf: generally 2--6(11) cm. Sporangium Case: +- 2--3 mm diam; stalk 1--3 mm. Chromosomes: 2n=20.
Ecology: Vernal pools, mud flats, lake margins; Elevation: < 2000 m. Bioregional Distribution: NCoRI, CaR, SNF, n SNH, GV, CCo, SnFrB, SCoR, SCo, WTR, PR, MP; Distribution Outside California: Oregon, Baja California; also scattered central and southeastern United States, South America. Note: Poorly collected, often overlooked due to its small, grass-like appearance.
eFlora Treatment Author: Andy Murdock, Alan R. Smith & Thomas Lemieux
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botanical illustration including Pilularia americana

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Citation for this treatment: Andy Murdock, Alan R. Smith & Thomas Lemieux 2016. Pilularia americana, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=38232, accessed on May 01, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 01, 2016.


Pilularia americana
click for enlargement
© 2004 Carol W. Witham
Pilularia americana
click for enlargement
© 2004 Carol W. Witham
Pilularia americana
click for enlargement
© 2004 Carol W. Witham
Pilularia americana
click for enlargement
© 2007 Carol W. Witham
Pilularia americana
click for enlargement
© 2004 Carol W. Witham

More photos of Pilularia americana in CalPhotos


Geographic subdivisions for Pilularia americana:
NCoRI, CaR, SNF, n SNH, GV, CCo, SnFrB, SCoR, SCo, WTR, PR, MP;
Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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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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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.