According to Kew Species Profiles[KSP]
- General Description
Hierochloe odorata is an aromatic grass native to Europe, Asia and North America, which has been used for incense and basketry by Native Americans.
Hierochloe odorata is a member of the grass family (Poaceae). It is also known by the alternative name Anthoxanthum nitens, as used in the Flora of China and Flora of North America. The common name, sweet grass, refers to the fragrance emitted when fresh plants are crushed or burned to release the vanilla-scented compound coumarin, which it contains. The common name holy grass relates to its use in church festivals by early Europeans.
- Species Profile
Geography and distribution
Native to Europe, Asia and North America, Hierochloe odorata is also widely naturalised. In North America it grows along the eastern coast from Labrador to New England.
Overview: Hierochloe odorata is a perennial, hairless or sparsely hairy, tufted plant with slender, creeping underground stems (rhizomes) and grows up to 55 cm tall.
Leaves: The aromatic leaf blades are 18–30 cm long and 0.04–0.10 cm wide. The edges of the leaf blades are slightly rough.
Flowers: The flowering parts are held in an open panicle (branched flowering structure), which is 4–11 cm long. The fertile spikelets (structures within which the flowers are held) are borne on hairless stems (pedicels) 2–4 mm long. The spikelets are composed of two sterile florets and one fertile floret.
Fruits: The fruit is a small, dry, thin-walled fruit with a single seed fused to the ovary wall (this fused product found in most grass species is termed a caryopsis).
Sweet grass has been used by Native Americans as incense, medicine for colds, analgesic and insecticide and in basketry; they also soaked it in water and used the infusion to wash their hair, skin and eyes.
Strewn on church floors by early Europeans, sweet grass was in some places dedicated to the Virgin Mary. Hierochloe odorata has also been used as an ingredient in strong alcoholic drinks in Eastern Europe. The Swedish botanist Carl Linnaeus reported that it was sold in Sweden to be hung over beds to induce sleep.
The distinctive, sweet scent of H. odorata is due to the presence of the chemical compound coumarin, which is also used to manufacture warfarin, used as a drug in surgery to prevent blood clotting and also as a rat poison.
Mouldy hay containing Hierochloe odorata should not be fed to cattle as Aspergillusspecies (fungi) turn coumarin into dicoumarol, which induces vitamin K deficiency and makes wounded animals more susceptible to bleeding.
Millennium Seed Bank: Saving seeds
The Millennium Seed Bank Partnership aims to save plant life worldwide, focusing on plants under threat and those of most use in the future. Seeds are dried, packaged and stored at a sub-zero temperature in our seed bank vault.
There are six collections of Hierochloe odorata held in Kew’s Millennium Seed Bank based at Wakehurst in West Sussex.
This species at Kew
Hierochloe odorata can be seen growing in the Grass Garden at Kew.
Pressed and dried specimens of sweet grass are held in Kew’s Herbarium, where they are available to researchers by appointment.
A specimen of Hierochloe odorata is held in Kew’s Economic Botany Collection in the Sir Joseph Banks Building, where it is available to researchers by appointment.
Kew at the British Museum - North American Landscape
Sweet grass ( Hierochloe odorata) was one of the 12 star plants featured in the 2012 North American Landscape - the fifth in the series created by Kew for the British Museum’s West Lawn.
North American plants have global ecological and economic importance and have been utilised by native peoples for thousands of years. Many were introduced to Europe following the colonisation of North America in the early 1600s. Grown for their medicinal uses, as food crops and for other economic purposes, some species have also become familiar ornamental garden plants.
The landscape was designed to evolve throughout the seasons - from a carpet of colourful daisies in the summer to spectacular orange and red maple leaves in the autumn. Other plantings included cypress, echinacea and carnivorous pitcher plants.
- Wetlands, mountain slopes, floodplains, marshes and roadsides.
- Not assessed according to IUCN Red List criteria, but considered to be rare in Britain.
Afghanistan, Alaska, Alberta, Aleutian Is., Altay, Arizona, Austria, Baltic States, Belarus, Belgium, British Columbia, Buryatiya, California, Central European Rus, China North-Central, China South-Central, China Southeast, Chita, Colorado, Connecticut, Czechoslovakia, Delaware, Denmark, East European Russia, Finland, France, Germany, Great Britain, Greenland, Iceland, Idaho, Illinois, Indiana, Inner Mongolia, Iowa, Iran, Ireland, Irkutsk, Italy, Kamchatka, Kazakhstan, Khabarovsk, Kirgizstan, Korea, Krasnoyarsk, Labrador, Magadan, Maine, Manchuria, Manitoba, Maryland, Masachusettes, Michigan, Minnesota, Mongolia, Montana, Nebraska, Nepal, Netherlands, Nevada, New Brunswick, New Hampshire, New Jersey, New Mexico, New York, Newfoundland, North Carolina, North Caucasus, North Dakota, North European Russi, Northwest European R, Northwest Territorie, Norway, Nova Scotia, Nunavut, Ohio, Ontario, Oregon, Pennsylvania, Poland, Prince Edward I., Qinghai, Québec, Rhode I., Saskatchewan, South Dakota, South European Russi, Sweden, Switzerland, Tibet, Transcaucasus, Turkey, Tuva, Ukraine, Utah, Vermont, Washington, West Siberia, West Virginia, Wisconsin, Wyoming, Xinjiang, Yakutskiya, Yukon
- Anthoxanthum hirtum subsp. arcticum (J.Presl) G.C.Tucker
- Anthoxanthum nitens subsp. balticum (G.Weim.) G.C.Tucker
- Hierochloe arctica J.Presl
- Hierochloe baltica (G.Weim.) Czerep.
- Hierochloe borealis (Schrad.) Roem. & Schult.
- Hierochloe hirta subsp. arctica (J.Presl) G.Weim.
- Hierochloe hirta subsp. praetermissa G.Weim.
- Hierochloe odorata (L.) P.Beauv.
- Hierochloe odorata f. eamesii Fernald
- Hierochloe odorata subsp. arctica (J.Presl) Tzvelev
- Hierochloe odorata subsp. hirta (Schrank) Tzvelev
- Hierochloe odorata subsp. kolymensis Prob.
- Hierochloe odorata subsp. praetermissa (G.Weim.) B.Walln.
- Hierochloe praetermissa (G.Weim.) Prob. & Tzvelev
- Holcus arcticus Sommerf.
- Holcus borealis Schrad.
- Holcus fragrans Willd.
- Holcus odoratus L.
- Savastana hirta Schrank
- Savastana odorata var. fragrans (Willd.) Farw.
- Torresia odorata (L.) Hitchc.
- Sweet grass
First published in Blumea 30: 348 (1985)
-  Clayton, W.D., Harman, K.T. & Williamson, H. (2006) World Grass Species - Synonymy database . The Board of Trustees of the Royal Botanic Gardens, Kew. [Cited as Hierochloe odorata.]
-  USDA, NRCS (2005- continuously updated) Natural Resources Conservation Services Plant Database . http://plants.usda.gov/cgi_bin/topics.cgi?earl=checklist.html. [Cited as Hierochloe odorata.]
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International Plant Names Index
The International Plant Names Index (2016). Published on the Internet http://www.ipni.org
[A] © Copyright 2016 International Plant Names Index. https://creativecommons.org/licenses/by/3.0
Kew Species Profiles
Kew Species Profiles
World Checklist of Selected Plant Families
World Checklist of Selected Plant Families(2016). Published on the Internet http://apps.kew.org/wcsp/
[D] See http://kew.org/about-kew/website-information/legal-notices/index.htm You may use data on these Terms and Conditions and on further condition that: The data is not used for commercial purposes; You may copy and retain data solely for scholarly, educational or research purposes; You may not publish our data, except for small extracts provided for illustrative purposes and duly acknowledged; You acknowledge the source of the data by the words "With the permission of the Trustees of the Royal Botanic Gardens, Kew" in a position which is reasonably prominent in view of your use of the data; Any other use of data or any other content from this website may only be made with our prior written agreement. http://creativecommons.org/licenses/by-nc-sa/3.0
[E] © Copyright 2016 International Plant Names Index and World Checkist of Selected Plant Families. https://creativecommons.org/licenses/by/3.0
[F] © Copyright 2017 International Plant Names Index and World Checkist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0