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JUNCAGINACEAE ARROW-GRASS FAMILY

David J. Keil

Annual, perennial herb, rhizomed or dense-tufted, terrestrial or aquatic.
Leaf: generally ± basal, alternate, ± flat to narrow- cylindric; sheath open, generally liguled.
Inflorescence: spike or generally ± scapose raceme; bracts 0.
Flower: generally bisexual; perianth parts generally 6 in 2 whorls (0, 1) [3, 4], free, ± green or tinged ± red-purple; stamens 0, 1, 3, or 6, filaments short, ± fused to perianth; pistil 1, carpels 1, 6 [3, 4], ± fused, separating in fruit [or not], each with 1 chamber and 1 ovule or 3 carpels fertile, 3 sterile, placentas basal, stigmas generally ± sessile.
Fruit: achene or generally mericarps.
3 genera, 30 species: temperate, circumboreal, Australia, s Africa, South America. [Haynes & Hellquist 2000 FNANM 22:43–46; von Mering & Kadereit 2010 in Seberg (ed.), Diversity, Phylogeny, and Evolution in the Monocotyledons, Aarhus Univ Press] Lilaea included in Triglochin. —Scientific Editor: Thomas J. Rosatti.
Unabridged references: [von Mering, S., Kadereit, J.W. (2010): Phylogeny, systematics and recircumscription of Juncaginaceae - a cosmopolitan wetland family. In Seberg, O. (ed.), Diversity, Phylogeny, and Evolution in the Monocotyledons: Proceedings of the Fourth International Conference on the Comparative Biology of the Monocotyledons. Aarhus University Press.]

TRIGLOCHIN ARROW-GRASS
Plant ± glabrous.
Leaf: basal, ± tufted; sheath membranous; ligule tip entire to 2-lobed [0].
Flower: perianth parts generally adaxially concave; anthers ± sessile; stigma papillate or ± plumose.
Fruit: achene or generally 3, 6 mericarps.
Seed: 1, linear, ± flat or angled.
± 20 species: temperate, circumboreal, Australia, s Africa, South America. (Greek: 3 points, from fruits of some) TOXIC when fresh, from cyanogenic compounds.

Key to Triglochin

T. striata Ruiz & Pav. THREE-RIBBED ARROW-GRASS
NATIVE
Perennial 1–2(4.5) dm, mat-forming; rhizomes spreading to ascending, slender.
Leaf: 5–20(45) cm, 1(2) mm wide, ± elliptic in ×-section; ligule 1–2.5 mm, tip rounded to acuminate.
Inflorescence: aerial raceme, 5–25(32) cm, < to > leaves; pedicels 0.4–2.1(3.5) mm in fruit, spreading to ascending.
Flower: perianth parts (< 6)6, (< 0.6)0.6–1 mm; stamens (< 6)6, often unequal; fertile carpels 3.
Fruit: mericarps 3, 1–1.5 mm, fully separating, abaxially strong-3-keeled.
2n=18,24. Uncommon. Brackish to freshwater coastal marshes, springs; < 30 m. North Coast, Central Coast, n South Coast; to Washington, se United States; Chile, Australasia, Africa, Madagascar, naturalized w Europe. May–Sep [Online Interchange]

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Next taxon: Laxmanniaceae

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Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].

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Bioregions in which taxon occurs 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.
map of distribution 1

Chart based on elevation range in Manual and elevations and coordinates of CCH records.
Data provided by the participants of the Consortium of California Herbaria.
Note: About half of the CCH records include both elevation and coordinates.
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 Manual flowering time.