Jepson eFlora: Taxon page    
    Vascular Plants of California
Key to families | Table of families and genera
Previous taxon Index to accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
Next taxon
Schoenoplectus triqueter

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: SchoenoplectusView DescriptionDichotomous Key

Habit: Generally perennial herb, generally erect, generally with long, scaly rhizomes; stem, leaf generally with air cavities. Stem: simple, smooth, (wiry). Leaf: generally all basal, whorled or 3-ranked; blade generally present, at least on distal sheath, smooth, or margin minute-scabrous; sheath closed, long; ligule glabrous. Inflorescence: terminal, branch stems often scabrous, main inflorescence bract like leaf blade; spikelets ovate, not +- flat, many-flowered; flower bracts spiraled, each with 1 flower in axil, ovate, 1-veined, brown to straw, dull, often fine-lined-spotted, membranous, generally +- scabrous, tip generally notched, generally with short awn. Flower: bisexual; perianth bristles +- straight, +- <= fruit, generally brown, reflexed-barbed (or with soft hairs) [(smooth)]; stamens generally 3; style 1, thread-like, base not enlarged, stigmas 2--3. Fruit: generally obovate, brown, generally smooth, mucronate; tubercle 0.
Species In Genus: +- 77 species: temperate, subtropics, worldwide. Etymology: (Greek, schoenos, a rush, reed, and plectos, plaited, twisted, woven, in reference to the use of stems in making useful objects)
eFlora Treatment Author: S. Galen Smith
Reference: Smith 2002 FNANM 23:44--60

Schoenoplectus triqueter (L.) Palla
Habit: Perennial herb 0.5--1.5 m; rhizome long, 2--10 mm diam. Stem: 2--4 mm diam, sharp-3-sided. Leaf: sheath fibers 0; blades 1--2, <= sheath, flat or V-shaped in ×-section. Inflorescence: panicle-, often head-like, inflorescence bract generally erect, 2--7 cm; spikelets 1--35, in clusters of 1--few, 5--12 mm, 2--4 mm wide; flower bract 3--3.5 mm, midrib, awn distally scabrous, tip notch 0.3 mm, awn to +- 0.3 mm. Flower: perianth bristles 4--6, <= fruit, barbed; stigmas 2. Fruit: 2--2.5 mm, 1.5--2 mm wide, 2-sided, smooth. Chromosomes: 2n=68.
Ecology: Fresh water marshes, shores; Elevation: +- 50 m. Bioregional Distribution: ScV; Distribution Outside California: to Washington; Eurasia. Flowering Time: Summer Note: Inclusion of Schoenoplectus triqueter based on 1 California collection: Sutter National Wildlife Refuge, 1954, D.B. Marshall s.n. (UC, CAS/DS, DAV); site since extensively bulldozed and otherwise changed by management. Before Smith was aware of presence in North America of naturalized Schoenoplectus triqueter, he identified the DAV specimen as possibly Schoenoplectus americanus × acutus or Schoenoplectus tabernaemontani × Schoenoplectus californicus, but in 2002 he identified the CAS/DS duplicate as Schoenoplectus triqueter, and in 2005 and 2006 he re-identified the DAV and UC duplicates as Schoenoplectus triqueter.
Synonyms: Scirpus triqueter L.;
eFlora Treatment Author: S. Galen Smith
Reference: Smith 2002 FNANM 23:44--60
Jepson Online Interchange

Previous taxon: Schoenoplectus tabernaemontani
Next taxon: Schoenus

Name Search


Citation for this treatment: S. Galen Smith 2012, Schoenoplectus triqueter, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on July 19, 2018.

Citation for the whole project: Jepson Flora Project (eds.) 2018, Jepson eFlora,, accessed on July 19, 2018.

Geographic subdivisions for Schoenoplectus triqueter:
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, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time.