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From Wikipedia, the free encyclopedia

Arrowgrass
Triglochin palustris
Triglochin calcitrapa
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Alismatales
Family: Juncaginaceae
Genus: Triglochin
L.
Synonyms[1]
  • Juncago Ség.
  • Lilaea Bonpl.
  • Tristemon Raf. 1819 not Raf. 1838 (Juncaceae) nor Klotzsch 1838 (Ericaceae) nor Scheele 1848 (Cucurbitaceae)[2]
  • Abbotia Raf.
  • Heterostylus Hook.
  • Hexaglochin Nieuwl.

Triglochin is a plant genus in the family Juncaginaceae described by Carl Linnaeus in 1753.[3][4] It includes 25 known species. It is very nearly cosmopolitan in distribution, with species on every continent except Antarctica. North America has four accepted species, two of which can also be found in Europe: Triglochin palustris (marsh arrowgrass) and Triglochin maritima (sea arrowgrass).[5][6] Australia has many more.[1][7]

The most widely used common name for the genus is arrowgrass,[8] although these plants are not really grasses. Many of the common names for species make use of the term "arrowgrass", although there are exceptions: T. procera, for example, is commonly known as water ribbons.

Arrowgrasses are used as food plants by the larvae of some Lepidoptera species including the grey chi moth.

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Transcription

Description

This genus contains marsh herbs with flat or cylindrical leaves.[9]

The inflorescences are spikes or racemes. The flowers have two bracts. Each flower has three or six herbaceous and deciduous perianth segments. Three to six stamens are connected at the base of the perianth segments and fall with the perianths. There are three to six carpels with a one chambered ovary containing a single ovule. The styles are short and may be fused at the base. The stigmas are often stalkless and plumose.[9]

The fruits have 3-6 free or fused curved follicles or achenes (small, dry, one seeded fruits with a loose covering)that break away from a persistent three winged axis. The seed is erect with a straight embryo.[9]

Species

The following species are accepted:[1]

formerly included

now in other genera: Bulbine, Cycnogeton and Tetroncium

References

  1. ^ a b c Kew World Checklist of Selected Plant Families
  2. ^ Tropicos search for Tristemon
  3. ^ Linnaeus, Carl von. 1753.  Species Plantarum 1: 338-33* in Latin
  4. ^ Tropicos, Triglochin L.
  5. ^ Flora of North America Vol. 22 Arrow-grass, troscart Triglochin Linnaeus
  6. ^ Altervista Flora Italiana, genere Triglochin includes photos plus European distribution maps
  7. ^ Flora of China Vol. 23 Page 105 水麦冬属 shui mai dong shu Triglochin Linnaeus
  8. ^ USDA, NRCS (n.d.). "Triglochin". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 15 December 2015.
  9. ^ a b c Phillips, Edwin Percy (1951). The genera of South African flowering plants. South Africa: Government Printer.

External links

This page was last edited on 15 October 2023, at 16:53
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