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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, southern 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, southern 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 herb 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.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Jul 29 2014
Citation for this treatment: [Author of taxon treatment] 2013. Triglochin, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=47200, accessed on Jul 29 2014

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click for enlargement Triglochin palustris
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2006 Dean Wm. Taylor, Ph.D.

Bioregions in which Triglochin palustris 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.
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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.