Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora.



Alan R. Smith and Thomas Lemieux

Plant generally aquatic, generally rooted in, often stranded on mud; rhizome creeping, slender, branched
Leaves floating, emergent, or out of water, ± alike; blade 1-palmate or 0, << petiole; veins not or repeatedly forked, free or netted
Sporangia in stalked, spheric or ± flat-ovoid, hard cases of 1 kind, near petiole base
Spores large (female) and small (male), in separate sporangia
Genera in family: 3 genera, ± 70 species: especially temp.


Leaf grass-like; blade 0
Sporangium case fused only to stalk tip, spheric, hairy; teeth 0
Species in genus: ± 6 species: generally temp
Etymology: (Latin: little ball, from sporangium case)


P. americana A. Braun

Leaves generally 2–6(11) cm
Sporangium case ± 2–3 mm diam
Chromosomes: 2n=20
Ecology: Vernal pools, mud flats, lake margins, reservoirs, etc.
Elevation: < 1500 m.
Bioregional distribution: Inner North Coast Ranges, Cascade Range, n&c Sierra Nevada Foothills, n High Sierra Nevada, Great Central Valley, San Francisco Bay Area, South Coast Ranges, South Coast, Western Transverse Ranges, Peninsular Ranges
Distribution outside California: Oregon, Baja California; also scattered c&se US, S.America
Poorly collected, often overlooked due to its small, grass-like appearance
Horticultural information: TRY.

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bioregional map for PILULARIA%20americana 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 Pilularia americana
Retrieve dichotomous key for Pilularia
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
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