Jepson eFlora: Taxon page
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Isoetes orcuttii

Higher Taxonomy
Family: IsoetaceaeView Description 

Habit: Perennial herb, aquatic to terrestrial. Stem: buried, corm-like, 2--3-lobed, corky, brown. Leaf: simple, in grass-like tufts, spirally arranged on stem top, erect to spreading, < 30 cm, linear above base.
Genera In Family: 1 genus, 200+ species: worldwide.
eFlora Treatment Author: W. Carl Taylor & Jon E. Keeley
Scientific Editor: Alan R. Smith, Thomas J. Rosatti.
Genus: IsoetesView DescriptionDichotomous Key

Common Name: QUILLWORT

Etymology: (Greek: evergreen, from habit of some species) Note: Perhaps most poorly known lycophyte genus. Mature female spores, found in decaying leaf bases or soil, critical for identification, as are hand lens for texture when dry, microscope with micrometer for size. Hybrids (spores of variable size, shape) common between aquatic species, making them less distinct.

Isoetes orcuttii A.A. Eaton
Habit: Plant becoming terrestrial. Leaf: deciduous, generally < 8 cm, < 1 mm wide at middle, soft, flexible, tapered to tip, bright green; base white to +- brown, outermost fertile, often surrounded by several black scales. Chromosomes: 2n=22.
Ecology: Vernal pools; Elevation: < 1700 m. Bioregional Distribution: NCoRI, (Howell Mtn, Napa Co.), CaR, n&c SNF, SNH, GV, CCo, SnFrB, SCo, PR; Distribution Outside California: southwestern Oregon; Baja California. Note: Spores mature spring.
eFlora Treatment Author: W. Carl Taylor & Jon E. Keeley
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Citation for this treatment: W. Carl Taylor & Jon E. Keeley 2012, Isoetes orcuttii, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on December 17, 2017.

Citation for the whole project: Jepson Flora Project (eds.) 2017, Jepson eFlora,, accessed on December 17, 2017.

Isoetes orcuttii
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© 2004 Carol W. Witham
Isoetes orcuttii
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© 2012 Gary A. Monroe

More photos of Isoetes orcuttii in CalPhotos

Geographic subdivisions for Isoetes orcuttii:
NCoRI, (Howell Mtn, Napa Co.), CaR, n&c SNF, SNH, GV, CCo, SnFrB, SCo, PR;
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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).

View elevation by latitude chart
Data provided by the participants of the Consortium of California Herbaria.
View all CCH records

CCH collections by month

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