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Chenopodium is a genus of numerous species of perennial or annual herbaceous flowering plants known as the goosefoots, which occur almost anywhere in the world. It is placed in the family Amaranthaceae in the APG II system; older classification systems, notably the widely used Cronquist system, separate it and its relatives as Chenopodiaceae, but this leaves the rest of the Amaranthaceae polyphyletic. However, among the Amaranthaceae, the genus Chenopodium is the namesake member of the subfamily Chenopodioideae.
The species of Chenopodium (s.str., description according to Fuentes et al. 2012) are annual or perennial herbs, shrubs or small trees. They generally rely on alkaline soil. They are nonaromatic, but sometimes fetid. The young stems and leaves are often densely covered by vesicular globose hairs, thus looking farinose. Characteristically, these trichomes persist, collapsing later and becoming cup-shaped. The branched stems grow erect, ascending, prostrate or scrambling. Lateral branches are alternate (the lowermost ones can be nearly opposite). The alternate or opposite leaves are petiolate. Their thin or slightly fleshy leaf blade is linear, rhombic or triangular-hastate, with entire or dentate or lobed margins.
Inflorescences are standing terminal and lateral. They consist of spicately or paniculately arranged glomerules of flowers. Plants are monoecious (rarely dioecious). In monoecious plants flowers are dimorphic or pistillate. Flowers consist of (4–) 5 perianth segments connate, basally or close to the middle, usually membranous margined and with a roundish to keeled back; almost always 5 stamens, and one ovary with 2 stigmas.
In fruit, perianth segments become sometimes coloured, but mostly keep unchanged, somewhat closing over or spreading from the fruit. The pericarp is membranous or sometimes succulent, adherent to or loosely covering the seed. The horizontally oriented seeds are depressed-globular to lenticular, with rounded to subacute margin. The black seed coat is almost smooth to finely striate, rugulose or pitted.
Uses and human importance
The genus Chenopodium contains several plants of minor to moderate importance as food crops as leaf vegetables – used like the closely related spinach (Spinacia oleracea) and similar plants called quelite in Mexico – and pseudocereals. These include white goosefoot (C. album), kañiwa (C. pallidicaule) and quinoa (C. quinoa). On the Greek island of Crete, tender shoots and leaves of a species called krouvida (κρουβίδα) or psarovlito (ψαρόβλητο) are eaten by the locals, boiled or steamed. As studied by Bruce D. Smith, Kristen Gremillion and others, goosefoots have a history of culinary use dating back to 4000 BC or earlier, when pitseed goosefoot (C. berlandieri) was a staple crop in the Native American Eastern Agricultural Complex, and white goosefoot was apparently used by the Ertebølle culture of Europe. Members of the eastern Yamnaya culture also harvested white goosefoot as an apparent cereal substitute to round out an otherwise mostly meat and dairy diet c. 3500–2500 BC.
There is increased interest in particular in goosefoot seeds today, which are suitable as part of a gluten-free diet. Quinoa oil, extracted from the seeds of C. quinoa, has similar properties, but is superior in quality, to corn oil. Oil of chenopodium is extracted from the seeds of epazote, which is not in this genus anymore. Shagreen leather was produced in the past using the small, hard goosefoot seeds. C. album was one of the main model organisms for the molecular biological study of chlorophyllase.
Goosefoot pollen, in particular of the widespread and usually abundant C. album, is an allergen to many people and a common cause of hay fever. The same species, as well as some others, have seeds which are able to persist for years in the soil seed bank. Many goosefoot species are thus significant weeds, and some have become invasive species.
In Australia, the larger Chenopodium species are among the plants called "bluebushes". According to the 1889 book The Useful Native Plants of Australia, Chenopodium auricomum "is another of the salt-bushes, which, besides being invaluable food for stock, can be eaten by man. All plants of the Natural Order Chenopodiaceae (Salsolacese) are more or less useful in this respect." The book goes on to give the following account from the Journal de la Ferme et des Maisons de campagne:
We have recently gathered an abundant harvest of leaves from two or three plants growing in our garden. These leaves were put into boiling water to blanch them, and they were then cooked as an ordinary dish of spinach, with this difference in favour of the new plant, that there was no occasion to take away the threads which are so disagreeable in chicory, sorrel, and ordinary spinach. We partook of this dish with relish—the flavour—analogous to spinach, had something in it more refined, less grassy in taste. The cultivation is easy: sow the seed in April (October) in a well-manured bed, for the plant is greedy; water it. The leaves may be gathered from the time the plant attains 50 centimetres (say 20 inches) in height. They grow up again quickly. In less than eight days afterwards another gathering may take place, and so on to the end of the year.
Certain species grow in large thickets, providing cover for small animals. Goosefoot foliage is used as food by the caterpillars of certain Lepidoptera. The seeds are eaten by many birds, such as the yellowhammer (Emberiza citrinella) of Europe or the white-winged fairy-wren (Malurus leucopterus) of Australia. Goosefoot pathogens include the positive-sense ssRNA viruses – apple stem grooving virus, sowbane mosaic virus and tobacco necrosis virus.
The genus Chenopodium was described by Carl Linnaeus in 1753 (In: Species Plantarum, Vol. 1, p. 218–222). Type species is Chenopodium album. This generic name is derived from the particular shape of the leaf, which is similar to a goose's foot: from Greek χήν (chen), "goose" and πούς (pous), "foot" or ποδίον (podion), "little foot".
In its traditional circumscription, Chenopodium comprised about 170 species. Phylogenetic research revealed, that the genus was highly polyphyletic and did not reflect how species were naturally related. Therefore, a new classification was necessary. Mosyakin & Clemants (2002, 2008) separated the glandular species as genus Dysphania (which includes epazote) and Teloxys in tribe Dysphanieae. Fuentes-Bazan et al. (2012) separated many species to genera Blitum (in tribe Anserineae), Chenopodiastrum, Lipandra, and Oxybasis (like Chenopodium in tribe Atripliceae). They included Rhagodia and Einadia in Chenopodium.
Selected species
- Chenopodium acicularis
- Chenopodium acuminatum Willd.
- Chenopodium albescens
- Chenopodium album – white goosefoot, nickel greens, dungweed, bathua, chandali, chandaliya, fat hen, lamb's quarters, pigweed
- Chenopodium album ssp. amaranticolor
- Chenopodium allanii
- Chenopodium arizonicum – Arizona goosefoot
- Chenopodium atrovirens – dark goosefoot, pinyon goosefoot
- Chenopodium aureum – golden goosefoot
- Chenopodium auricomiforme
- Chenopodium auricomum – Queensland bluebush
- Chenopodium baccatum (Syn. Rhagodia baccata)
- Chenopodium benthamii (Syn.: Rhagodia latifolia)
- Chenopodium berlandieri – pitseed goosefoot, southern huauzontle, lambsquarters
- Chenopodium berlandieri ssp. nuttalliae (Saff.) H.D.Wilson & Heiser
- Chenopodium berlandieri var. bushianum
- Chenopodium berlandieri var. zschackii
- Chenopodium brandegeeae – Brandegee's goosefoot
- Chenopodium bryoniifolium Bunge – Korean goosefoot
- Chenopodium bushianum – village goosefoot
- Chenopodium candolleanum (Syn.: Rhagodia candolleana)
- Chenopodium curvispicatum
- Chenopodium cycloides – sandhill goosefoot
- Chenopodium desertorum – desert goosefoot
- Chenopodium desertorum ssp. anidiophyllum
- Chenopodium desertorum ssp. desertorum
- Chenopodium desertorum ssp. microphyllum
- Chenopodium desertorum ssp. rectum
- Chenopodium desertorum ssp. virosum
- Chenopodium desiccatum – narrowleaf goosefoot
- Chenopodium detestans – New Zealand fish-guts plant
- Chenopodium drummondii (Syn.: Rhagodia drummondii)
- Chenopodium eastwoodiae – Eastwood's goosefoot
- Chenopodium eremaea (Syn.: Rhagodia eremaea)
- Chenopodium erosum R.Br.
- Chenopodium ficifolium – fig-leaved goosefoot, small goosefoot
- Chenopodium flabellifolium – San Martin Island goosefoot, flabelliform goosefoot
- Chenopodium foggii – Fogg's goosefoot
- Chenopodium formosanum – red quinoa, djulis
- Chenopodium fremontii – Fremont's goosefoot
- Chenopodium giganteum D.Don – tree spinach
- Chenopodium gigantospermum
- Chenopodium hians
- Chenopodium howellii – Howell's goosefoot
- Chenopodium iljinii
- Chenopodium incanum – mealy goosefoot
- Chenopodium incognitum
- Chenopodium lenticulare
- Chenopodium leptophyllum – narrowleaf goosefoot
- Chenopodium lineatum – Mono goosefoot
- Chenopodium littoreum – coastal goosefoot
- Chenopodium luteum – yellow goosefoot
- Chenopodium missouriense – Missouri goosefoot (sometimes considered a variety of C. album)
- Chenopodium neomexicanum – New Mexico goosefoot
- Chenopodium nevadense – Nevada goosefoot
- Chenopodium nitrariaceum (F.Muell.) F.Muell. ex Benth. – nitre goosefoot
- Chenopodium nitens – shiny goosefoot
- Chenopodium nutans (Syn.: Rhagodia nutans)
- Chenopodium nuttalliae – huauzontle, chia roja, quelite
- Chenopodium oahuense – ʻĀheahea (Hawaiʻi)
- Chenopodium obscurum
- Chenopodium opulifolium Schrad. ex W.D.J.Koch – grey goosefoot
- Chenopodium pallescens – pallid goosefoot
- Chenopodium pallidicaule – kañiwa, "cañahua"
- Chenopodium palmeri – Palmer's goosefoot
- Chenopodium pamiricum
- Chenopodium parabolicum (Syn.: Rhagodia parabolica)
- Chenopodium parryi – Parry's goosefoot
- Chenopodium petiolare
- Chenopodium polygonoides
- Chenopodium pratericola Rydb. – pale goosefoot, desert goosefoot, narrowleaf goosefoot
- Chenopodium preissii (Syn. Rhagodia preissii)
- Chenopodium probstii Aellen
- Chenopodium purpurascens – purple goosefoot
- Chenopodium quinoa – quinoa
- Chenopodium retusum
- Chenopodium robertianum (Syn.: Rhagodia hastata)
- Chenopodium salinum – Rocky Mountain goosefoot
- Chenopodium sandersii – Sander's goosefoot
- Chenopodium simpsonii – Simpson's goosefoot
- Chenopodium sonorense – Sonoran goosefoot
- Chenopodium spinescens (Syn. Rhagodia spinescens)
- Chenopodium standleyanum – Standley's goosefoot
- Chenopodium strictum Roth
- Chenopodium subglabrum – smooth arid goosefoot, smooth goosefoot
- Chenopodium suecicum – green goosefoot
- Chenopodium triandrum (Syn.: Rhagodia triandra)
- Chenopodium trigonon (Syn.: Einadia trigonos)
- Chenopodium truncatum
- Chenopodium twisselmannii – Twisselmann's goosefoot, high meadow goosefoot
- Chenopodium ulicinum
- Chenopodium × variabile (C. album × C. berlandieri)
- Chenopodium vulvaria – stinking goosefoot, notchweed
- Chenopodium wahlii – Wahl's goosefoot
- Chenopodium watsonii – Watson's goosefoot
- Chenopodium wilsonii (Syn.: Rhagodia crassifolia)
- Blitum (12 species):
- Blitum bonus-henricus – Good King Henry, perennial goosefoot, poor-man's asparagus, Lincolnshire spinach, markery
- Blitum californicum – California goosefoot, Indian lettuce
- Blitum capitatum – strawberry blite, blite goosefoot, strawberry goosefoot, strawberry spinach, Indian paint, Indian ink
- Blitum virgatum (Syn. Chenopodium foliosum) – leafy goosefoot
- Chenopodiastrum (5 species):
- Dysphania (about 43 glandular species, as C. botrys, C. carinatum, C. cristatum, C. melanocarpum, C. multifidium, C. pumilio and more)
- Lipandra (one species):
- Lipandra polysperma – many-seeded goosefoot
- Oxybasis (5 species):
- Teloxys (one species):
- Teloxys aristata
- Suaeda australis – austral seablite (as C. australe, C. insulare)
- Susy Fuentes-Bazan, Pertti Uotila, Thomas Borsch: A novel phylogeny-based generic classification for Chenopodium sensu lato, and a tribal rearrangement of Chenopodioideae (Chenopodiaceae). In: Willdenowia. Vol. 42, No. 1, 2012, p. 5-24.
- Gelin Zhu, Sergei L. Mosyakin & Steven E. Clemants: Chenopodium - In: Wu Zhengyi, Peter H. Raven, Deyuan Hong (Hrsg.): Flora of China. Volume 5: Ulmaceae through Basellaceae. Science Press/Missouri Botanical Garden Press, Beijing/St. Louis 2003, ISBN 1-930723-27-X, p. 378-.
- Chisholm, Hugh, ed. (1911). Encyclopædia Britannica. Vol. 6 (11th ed.). Cambridge University Press. p. 80. .
- Taylor, Ronald J. (1994) . Sagebrush Country: A Wildflower Sanctuary (rev. ed.). Missoula, MT: Mountain Press Pub. Co. p. 64. ISBN 0-87842-280-3. OCLC 25708726.
- Anthony, David (2007). The horse, the wheel, and language. Princeton university press. pp. 302–303.
- "Amaranthus and Chenopodium". alabamaallergy.com. 2017-10-13. Retrieved 2021-03-03.
- J. H. Maiden (1889). The useful native plants of Australia : Including Tasmania. Turner and Henderson, Sydney. pp. 15–16.
- English Names for Korean Native Plants (PDF). Pocheon: Korea National Arboretum. 2015. p. 407. ISBN 978-89-97450-98-5. Archived from the original (PDF) on 25 May 2017. Retrieved 24 December 2016 – via Korea Forest Service.
- The floral change in the tertiary of the Rhön mountains (Germany) by Dieter Hans Mai - Acta Paleobotanica 47(1): 135-143, 2007.
- Sukhorukov, Alexander P.; Zhang, Mingli (2013). "Fruit and Seed Anatomy of Chenopodium and Related Genera (Chenopodioideae, Chenopodiaceae/Amaranthaceae): Implications for Evolution and Taxonomy". PLOS ONE. 8 (4): e61906. Bibcode:2013PLoSO...861906S. doi:10.1371/journal.pone.0061906. PMC 3633980. PMID 23626750.