Dactylis glomerata explained

Dactylis glomerata is a species of flowering plant in the grass family Poaceae, known as cock's-foot,[1] also colloquially as orchard grass, or cat grass (due to its popularity for use with domestic cats). It is a cool-season perennial C3 tufted grass native throughout most of Europe, temperate Asia, and northern Africa.[2] [1] [3] [4]

Distribution

Dactylis glomerata occurs from sea level in the north of its range, to as high as 4,000 metres in elevation in the south of its range in Pakistan. It is widely used for hay and forage.[4]

It is a principal species in the widespread National Vegetation Classification habitat community MG1 (Arrhenatherum elatius grassland) in the United Kingdom, and so can be found with Arrhenatherum elatius (false oat grass).[5] It can be found in meadows, pasture, roadsides, and rough grassland.

It has been introduced into North America, New Zealand and Australia, and is now widely naturalised.[6] In some areas, it has become an invasive species.

Description

Cock's-foot grows in dense perennial tussocks to 20cm–140cmcm (10inches–60inchescm) tall, with grey-green leaves 20cm–50cmcm (10inches–20inchescm) long and up to 1.5cm (00.6inches) broad, and a distinctive tufted triangular flowerhead 10cm–50cmcm (00inches–20inchescm) long, which may be either green or red- to purple-tinged (usually green in shade, redder in full sun), turning pale grey-brown at seed maturity. The spikelets are 5mm9mm long, typically containing two to five flowers. It has a characteristic flattened stem base which distinguishes it from many other grasses.[1] [4]

It flowers from June to September.[7]

Taxonomy

Dactylis glomerata is treated as the sole species in the genus Dactylis by some authors,[2] while others include one to four other species.[8] [9] It is commonly divided into several regional subspecies, particularly by those authors accepting only the single species.[2] [8] Plants of the World Online accepts 20 subspecies.

Dactylis glomerata subsp. glomerata and subsp. hispanica are tetraploid forms with 28 chromosomes; some of the other subspecies, including subsp. himalayensis and subsp. lobata are diploid, with 2n = 14. Hexaploid forms with 42 chromosomes are also known, but rare.[10] Tetraploid forms are larger and coarser than diploid forms.[10]

Cultivation and uses

Cock's-foot is widely used as a hay grass and for pastures because of its high yields and sugar content, which makes it sweeter than most other temperate grasses. In dry areas as in much of Australia, Mediterranean subspecies such as subsp. hispanica are preferred for their greater drought tolerance.[11] It requires careful grazing management; if it is undergrazed it becomes coarse and unpalatable.

In some areas to which it has been introduced, cock's-foot has become an invasive weed, notably some areas of the eastern United States.[8]

As with other grasses, the pollen can cause allergic rhinitis (hay fever) in some people.

The grass is popularly grown to satisfy the craving of domestic cats to chew grass, hence its colloquial name cat grass.[12]

The seeds were first collected by Rogers Parker in Hertfordshire; this was then developed by the agricultural reformer Coke of Norfolk.[13] Parker's estate, Munden, near Bricket Wood, was inherited by the botanist George Hibbert.[14]

Butterfly foodplant

The caterpillars of many butterfly species feed on cock's foot, including:[15]

Notes and References

  1. Interactive Flora of NW Europe Dactylis glomerata (Cock's-foot)
  2. Flora Europaea: Dactylis glomerata
  3. USDA Plant Fact Sheet: ORCHARDGRASS
  4. Web site: FAO factsheet: Dactylis glomerata . 2010-10-05 . 2015-09-24 . https://web.archive.org/web/20150924043829/http://www.fao.org/ag/AGP/AGPC/doc/Gbase/DATA/Pf000431.HTM . dead .
  5. Web site: False Oat Grass Description . Botanical Society of Britain & Ireland (BSBI) . https://web.archive.org/web/20110717004923/http://www.bsbi.org.uk/identification.html . 2011-07-17 . 10 December 2010.
  6. Web site: Plants of Hawaii . Dactylis glomerata (cocksfoot) . 2010-10-05 . 2008-10-06 . https://web.archive.org/web/20081006212433/http://www.hear.org/starr/hiplants/images/thumbnails/html/dactylis_glomerata.htm . dead .
  7. Hubbard, C. E. Grasses. Penguin. 1978.
  8. https://www.ars-grin.gov/cgi-bin/npgs/html/splist.pl?3351 Species Records of Dactylis
  9. Web site: Dactylis L. . . . 26 August 2024.
  10. Míka, V., Kohoutek, A., & Odstrèilová, V. (2002). Characteristics of important diploid and tetraploid subspecies of Dactylis from point of view of the forage crop production. Rostlinná Výroba 48 (6): 243–248.
  11. NSW Department of Primary Industries PrimeFacts: Cocksfoot
  12. Victoria Nursery: Catgrass plant
  13. Book: Baxter. The Library of Agricultural and Horticultural Knowledge: With an Appendix on Suspended Animation, Poisons, and the Principal Laws Relating to Farming and Rural Affairs. 1830. 228–229, 523.
  14. Book: Hall. Legacies of British Slave-Ownership: Colonial Slavery and the Formation of Victorian Britain. Cambridge University Press. 221. etal.
  15. Natural England: Cocksfoot - Dactylis glomerata

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