Sweet_clover

<i>Melilotus</i>

Melilotus

Genus of flowering plants in the bean family Fabaceae

This article is about the genus of grassland plants. For the moshav, see Mlilot.

Quick Facts Melilotus, Scientific classification ...
Melilotus albus

Melilotus, known as melilot, sweet clover, and kumoniga (from the Cumans),[3] is a genus in the family Fabaceae (the same family that also includes the Trifolium clovers). Members are known as common grassland plants and as weeds of cultivated ground. Originally from Europe and Asia, it is now found worldwide.

This legume is commonly named for its sweet smell, which is due to the presence of coumarin in its tissues. Coumarin, though responsible for the sweet smell of hay and newly mowed grass, has a bitter taste, and, as such, possibly acts as a means for the plant to discourage consumption by animals.[4] Fungi (including Penicillium, Aspergillus, Fusarium, and Mucor[5]) can convert coumarin into dicoumarol, a toxic anticoagulant. Consequently, dicoumarol may be found in decaying sweet-clover, and was the cause of the so-called sweet-clover disease, recognized in cattle in the 1920s.[6] A few varieties of sweet clover have been developed with low coumarin content and are safer for forage and silage.[7]

The name sweet clover varies orthographically (sweet-clover, sweetclover).

Uses

Melilotus species are eaten by the larvae of some Lepidoptera species, such as those of the genus Coleophora, including C. frischella and C. trifolii.

Melilotus, often used as a green manure, can be turned into the soil to increase its nitrogen and organic matter content. It is especially valuable in heavy soils because of its deep rooting. However, it may fail if the soil is too acidic. It should be turned into the soil when 8 to 10 inches tall. Unscarified seed is best sown in spring when the ground is not too dry; scarified seed is better sown in late fall or even in the snow, so it will germinate before competing weeds the following spring.[8]

Melilotus siculus (messina) is notable for its high combined tolerance to salinity and water logging. As of 2019, the "Neptune" variety has the highest tolerance and persistence under salinity among all pasture legumes, according to the Australian Department of Primary Industries and Regional Development. The salt-tolerant symbioant Ensifer medicae SRDI554 is recommended.[9]

Others

Blue melilot (Trigonella caerulea) is not a member of the genus, despite the name.

Species

The genus Melilotus currently has nineteen recognized species:[10]

References

  1. [1]
    "Melilotus Mill. | Plants of the World Online | Kew Science". Plants of the World Online. Retrieved 2020-06-28.
  2. [2]
    Woodgate, Katherine; Maxted, Nigel; Bennett, Sarita Jane (1996). Bennett, Sarita Jane; Cocks, Philip Stanley (eds.). Genetic resources of Mediterranean pasture and forage legumes. Current Plant Science and Biotechnology in Agriculture. Vol. 33. Norwell, MA: Kluwer Academic Publishers. p. 203. ISBN 978-0-7923-5522-9.
  3. [3]
    Bulgarian Folk Customs, Mercia MacDermott, pg 27
  4. [4]
    "Phytochemicals.info:Coumarin". Retrieved 26 November 2011.
  5. [5]
    Edwards WC, Burrows GE, Tyr RJ: 1984, Toxic plants of Oklahoma:clovers. Okla Vet Med Assoc 36:30-32.
  6. [6]
    Behzad Yamini; Robert H. Poppenga; W. Emmett Braselton Jr.; Lawrence J. Judge (1995). "Dicoumarol (moldy sweet clover) toxicosis in a group of Holstein calves". J Vet Diagn Invest. 7 (3): 420–422. doi:10.1177/104063879500700328. PMID 7578469.
  7. [7]
    Christina Curell (July 2, 2013). "Sweet clovers: What is the difference between yellow sweet clover and white sweet clover?". Michigan State University. Retrieved 17 May 2017.
  8. [8]
    Five Acres and Independence by M.G. Kains. 1973.
  9. [9]
    "Neptune messina – a new pasture legume for saline soils prone to waterlogging". www.agric.wa.gov.au.
  10. [10]
    "Species Nomenclature in GRIN". Archived from the original on 14 October 2008. Retrieved 4 August 2010.
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