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Isolepis levynsiana

Higher Taxonomy
Family: CyperaceaeView DescriptionDichotomous Key

Habit: Annual, perennial herb, often rhizomed or stoloned, often of wet open places; roots fibrous; monoecious, dioecious, or flowers bisexual. Stem: generally 3-sided, generally solid. Leaf: generally 3-ranked; base sheathing, sheath generally closed, ligule generally 0; blade (0 or) linear, parallel-veined. Inflorescence: spikelets generally arranged in head-, spike-, raceme-, or panicle-like inflorescences; flower generally sessile in axil of flower bract, enclosed in a sac-like structure (perigynium) or generally not. Flower: unisexual or bisexual, small, generally wind-pollinated; perianth 0 or generally bristle like; stamens generally 3, anthers attached at base, 4 chambered; ovary superior, chamber 1, ovule 1, style 2--3-branched. Fruit: achene, 2--3 sided.
Genera In Family: +- 100 genera, 5000 species: especially temperate. Note: Difficult; taxa differ in technical characters of inflorescence, fruit. In Carex and Kobresia, what appear to be individual pistillate flowers in fact are highly reduced inflorescences (whether or not the same applies to staminate flowers is still under debate). In some other works (e.g., FNANM) these are called spikelets, and they are treated as being arranged in spikes. Here and in TJM (1993), what appear to be individual pistillate flowers are called pistillate flowers in Carex (and they are treated as being arranged in spikelets), but spikelets in Kobresia (and they are treated as being arranged into spikes). Though internally inconsistent, the approach here is consistent with traditional usage, and reflects a preference for character states that may be determined in the field. Molecular, morphological, and embryological evidence indicates that Eriophorum crinigerum is to be segregated to a new genus, as Calliscirpus criniger (A. Gray) C.N. Gilmour et al., along with a second, newly described species, Calliscirpus brachythrix C.N. Gilmour et al. (Gilmour et al. 2013); key to genera modified by Peter W. Ball to include Calliscirpus.
eFlora Treatment Author: S. Galen Smith, except as noted
Scientific Editor: S. Galen Smith, Thomas J. Rosatti, Bruce G. Baldwin.
Genus: IsolepisView DescriptionDichotomous Key

Habit: Annual, perennial herb, cespitose, rhizomed or not. Stem: simple, cylindric, <= 0.5 mm diam, not hollow. Leaf: basal, spiraled, 1--few; blade vestigial to >> sheath, <= 1 mm wide; ligule 0. Inflorescence: terminal, head-like, inflorescence bracts 1--2, 2--33 mm, leaf-like; spikelets 1--3(15), +- ovate, +- flat or not, many-flowered, 1--10 mm, 1--2 mm wide; flower bracts spiraled, each with 1 flower in axil, ovate, membranous, tip entire, generally short-awned. Flower: bisexual; perianth 0; stamens 1--3, anthers >= 0.6 mm; style 1, thread-like, base +- enlarged or not, stigmas 2--3. Fruit: +- wide-obovate, generally +- white to dark brown, minute-papillate, prominent-ridged lengthwise, or smooth, mucronate; tubercle 0.
Species In Genus: 69 species: temperate, subtropics, +- worldwide, especially Africa, Australia. Etymology: (Greek, isos, equal, similar, and lepis a flower bract)
eFlora Treatment Author: S. Galen Smith
Reference: Muasya et al. 2007 Novon 17:59
Unabridged Reference: Muasya et al. 2006 Novon 16:19--20; Smith 2002 FNANM 23:137--140; Musaya & Simpson 2002 Kew Bull 57:257--362

Isolepis levynsiana Muasya & D.A. Simpson
Habit: Annual 1--6 cm. Leaf: few. Inflorescence: inflorescence bracts 1--2, 3--16 mm, +- erect; spikelets 1--3(4), 4--10 mm, linear-oblong, +- flat; flower bracts 1.3--1.6 mm, lance-ovate, dull white tinted +- red or +- yellow, lateral veins 4--5 per side, conspicuous. Flower: stigmas 3. Fruit: 0.9--1 mm, 3-sided, fine-papillate.
Ecology: Damp, mossy openings in coastal forest; Elevation: +- 100 m. Bioregional Distribution: NCo (Mendocino, Sonoma cos.); Distribution Outside California: southern Africa, southern Australia, New Zealand. Flowering Time: Early spring
Synonyms: Cyperus tenellus L. f.; Isolepis tenella (L. f.) Muasya & D.A. Simpson, illeg.
eFlora Treatment Author: S. Galen Smith
Reference: Muasya et al. 2007 Novon 17:59
Unabridged Reference: Muasya et al. 2006 Novon 16:19--20; Smith 2002 FNANM 23:137--140; Musaya & Simpson 2002 Kew Bull 57:257--362
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Citation for this treatment: S. Galen Smith 2012, Isolepis levynsiana, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on December 14, 2017.

Citation for the whole project: Jepson Flora Project (eds.) 2017, Jepson eFlora,, accessed on December 14, 2017.

Geographic subdivisions for Isolepis levynsiana:
NCo (Mendocino, Sonoma cos.);
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).

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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.