Chenopodium berlandieri

Chenopodium berlandieri
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Core eudicots
Order: Caryophyllales
Family: Amaranthaceae
Genus: Chenopodium
Species: berlandieri
Binomial name
Chenopodium berlandieri
Moq.

Chenopodium berlandieri, also known by the common names pitseed goosefoot,[1] huauzontle, and lamb's quarters, is an annual herbaceous plant in the goosefoot family.

The species is widespread in North America, where it is native to Alaska and northern Canada south to Michoacán, Mexico, and including every U.S. state except Hawaii. The fast-growing, upright plant can reach heights of more than 3 m. It can be differentiated from most of the other members of its large genus by its honeycomb-pitted seeds, and further separated by its serrated, more or less evenly lobed lower leaves.[2]

Although widely regarded today as a weed, this species was once one of several plants grown by Native Americans in prehistoric North America as part of the Eastern Agricultural Complex. C. berlandieri was a domesticated pseudocereal crop, similar to the closely related quinoa C. quinoa. It continues to be cultivated in Mexico as a pseudocereal, as a leaf vegetable, and for its broccoli-like flowering shoots.

Taxonomy

The leaf of C. berlandieri

The species includes two subspecies: the type subspecies (i.e. C. b. ssp. berlandieri) and C. b. ssp. nuttalliae.[3] The latter, which also goes by the common names huauzontle, huauthili and Nuttall's goosefoot,[4] is a domesticated line still in cultivation in Mexico, and is distinguished by a substantial reduction in testa thickness.[3]

The type species includes these varieties:[2]

Additionally, the three important cultivars of the C. b. nuttalliae subspecies are:[3][5]

The principal difference between the wild and domesticated chenopodium is the thickness of the seed coat, the testa. In the domestic varieties because of human selection, the testa is less that 20 microns thick; the testa of wild chenopodium is 40 to 60 microns thick.[6] The species is capable of hybridizing with the related introduced European Chenopodium album, which it resembles, giving the hybrid C. × variabile Aellen.[7]

Domestication

C. berlandieri is one of the plants to be domesticated in the prehistoric and Woodland periods in eastern North America, making it a part of the Eastern Agricultural Complex. Archaeological evidence shows the species was extensively foraged as a wild plant in eastern North America as early as 6,500 BC. By 1700 BC, the plant had clearly been domesticated as a pseudocereal crop. A variety of regional cultivars have been recovered from various widely separated sites. The oldest evidence for domestication comes in the form of stashes of thin-testa seeds from rock shelters in eastern Kentucky. The crop ceased to be cultivated in the region by about 1750 AD.[3]

Although cultivation of the species died out in eastern North America, the plant continues to be grown as a domesticated crop in Mexico, though its cultivation has been declining. This cultivated form of the plant is ranked as a subspecies, namely C. b. ssp. nuttalliae. Three varieties of the subspecies are grown as a pseudocereal, as a leaf vegetable, and for its broccoli-like flowering shoots, respectively.[3][5]

Based on similarities between this modern cultivated form and the archaeological specimens from eastern North America, the species was suggested to have been first domesticated in Mexico and later brought to northern North America. Currently, no archaeological evidence supports this position, with some experts even suggesting the crop may have been absent from Mexico until the 16th century. Genetic studies have shown the wild eastern North American plants and the Mexican cultivated forms have considerable genetic distance between them. This has been interpreted as indicating a later, second domestication event in Mexico.[3]

See also

References

  1. ↑ "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-02-25. Retrieved 2014-10-17.
  2. 1 2 Clemants, Steven E.; Mosyakin, Sergei L. (2004), "Chenopodium berlandieri", in Flora of North America Editorial Committee, eds. 1993+, Flora of North America 4, New York & Oxford: Oxford University Press, p. 294
  3. 1 2 3 4 5 6 Smith, Bruce D. (2006). "Eastern North America as an Independent Center of Plant Domestication" (PDF). Proceedings of the National Academy of Sciences of the United States of America. pp. 12223–12228. doi:10.1073/pnas.0604335103. PMC 1567861. PMID 16894156.
  4. ↑ "Chenopodium berlandieri Moq.". Germplasm Resources Information Network (GRIN). Retrieved 2009-01-03.
  5. 1 2 Wilson, Hugh D.; Heiser Jr., Charles B.; Heiser, Charles B (1979), "The Origin and Evolutionary Relationships of 'Huauzontle' (Chenopodium nuttalliae Safford), Domesticated Chenopod of Mexico", American Journal of Botany 66 (2): 198–206, doi:10.2307/2442525, JSTOR 2442525
  6. ↑ Smith, Bruce D. (1995), The Emergence of Agriculture, New York: Scientific American Library, p. 184
  7. ↑ Clemants, Steven E.; Mosyakin, Sergei L. (2004), "Chenopodium album", in Flora of North America Editorial Committee, eds. 1993+, Flora of North America 4, New York & Oxford: Oxford University Press, p. 296

Further reading

External links

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