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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. palustris L. MARSH ARROW-GRASS
NATIVE
Perennial 1–3(5.5) dm, tufted; rhizomes ascending, ± stout.
Leaf: 5–30 cm, 0.5–2 mm wide, ± elliptic in ×-section; ligule 0.5–1.5 mm, tip generally deep-2-lobed.
Inflorescence: aerial raceme, generally 1–2 per plant, generally > leaves; pedicels generally 4–6 mm in fruit, erect.
Flower: perianth parts generally 6, 1.5–2 mm; stamens 6; fertile carpels 3.
Fruit: mericarps 3, 5–7(9) mm, distally clinging to fruit axis, abaxially weak-ridged.
2n=24. Wet meadows, wet flats, stream and lake margins; 2100–3450 m. c&s High Sierra Nevada; circumboreal, South America, New Zealand. Jul–Aug [Online Interchange] {CNPS list}

Previous taxon: Triglochin maritima
Next taxon: Triglochin scilloides

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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 occursRed area (if present) is the part of the bioregion lying between the upper and lower elevation limits of the taxon;
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 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.
Map made in collaboration with Scott Loarie. 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.