Allium is a genus of monocotyledonous flowering plants that includes hundreds of species, including the cultivated onion, garlic, scallion, shallot, leek, and chives. The generic name Allium is the Latin word for garlic, and the type species for the genus is Allium sativum which means "cultivated garlic".
1–3: see text
Linnaeus first described the genus Allium in 1753. Some sources refer to Greek αλεω (aleo, to avoid) by reason of the smell of garlic. Various Allium have been cultivated from the earliest times, and about a dozen species are economically important as crops, or garden vegetables, and an increasing number of species are important as ornamental plants.
Allium species occur in temperate climates of the Northern Hemisphere, except for a few species occurring in Chile (such as A. juncifolium), Brazil (A. sellovianum), and tropical Africa (A. spathaceum). They vary in height between 5 cm and 150 cm. The flowers form an umbel at the top of a leafless stalk. The bulbs vary in size between species, from small (around 2–3 mm in diameter) to rather large (8–10 cm). Some species (such as Welsh onion A. fistulosum) develop thickened leaf-bases rather than forming bulbs as such.
Plants of the genus Allium produce chemical compounds, mostly derived from cysteine sulfoxides, that give them a characteristic onion, or garlic, taste and odor. Many are used as food plants, though not all members of the genus are equally flavorful. In most cases, both bulb and leaves are edible. The cooking and consumption of parts of the plants is due to the large variety of textures, and flavours, which may be strong or weak, that they can impart to the dish they are used in. The characteristic Allium flavor depends on the sulfate content of the soil the plant grows in. In the rare occurrence of sulfur-free growth conditions, all Allium species completely lose their usual pungency.
In the APG III classification system, Allium is placed in the family Amaryllidaceae, subfamily Allioideae (formerly the family Alliaceae). In some of the older classification systems, Allium was placed in Liliaceae. Molecular phylogenetic studies have shown this circumscription of Liliaceae is not monophyletic.
Allium is one of about fifty-seven genera of flowering plants with more than 500 species. It is by far the largest genus in the Amaryllidaceae, and also in the Alliaceae in classification systems in which that family is recognized as separate.
The bulbs are solitary or clustered and tunicate and the plants are perennialized by the bulbs reforming annually from the base of the old bulbs, or are produced on the ends of rhizomes or, in a few species, at the ends of stolons. A small number of species have tuberous roots. The bulbs' outer coats are commonly brown or grey, with a smooth texture, and are fibrous, or with cellular reticulation. The inner coats of the bulbs are membranous.
Many alliums have basal leaves that commonly wither away from the tips downward before or while the plants flower, but some species have persistent foliage. Plants produce from one to 12 leaves, most species having linear, channeled or flat leaf blades. The leaf blades are straight or variously coiled, but some species have broad leaves, including A. victorialis and A. tricoccum. The leaves are sessile, and very rarely narrowed into a petiole.
The flowers, which are produced on scapes are erect or in some species pendent, having six petal-like tepals produced in two whorls. The flowers have one style and six epipetalous stamens; the anthers and pollen can vary in color depending on the species. The ovaries are superior, and three-lobed with three locules.
The terete or flattened flowering scapes are normally persistent. The inflorescences are umbels, in which the outside flowers bloom first and flowering progresses to the inside. Some species produce bulbils within the umbels, and in some species, such as Allium paradoxum, the bulbils replace some or all the flowers. The umbels are subtended by noticeable spathe bracts, which are commonly fused and normally have around three veins.
Some bulbous alliums increase by forming little bulbs or "offsets" around the old one, as well as by seed. Several species can form many bulbils in the flowerhead; in the so-called "tree onion" or Egyptian onion (A. × proliferum) the bulbils are few, but large enough to be pickled.
Many of the species of Allium have been used as food items throughout their ranges. There are several poisonous species that are somewhat similar in appearance (e.g. in North America, death camas, Toxicoscordion venenosum), but none of these has the distinctive scent of onions or garlic.
With over 850 species Allium is the sole genus in the Allieae, one of four tribes of subfamily Allioideae (Amaryllidaceae). New species continue to be described and Allium is one of the largest monocotyledonous genera, but the precise taxonomy of Allium is poorly understood, with incorrect descriptions being widespread. The difficulties arise from the fact that the genus displays considerable polymorphism and has adapted to a wide variety of habitats. Furthermore, traditional classications had been based on homoplasious characteristics (the independent evolution of similar features in species of different lineages). However, the genus has been shown to be monophyletic, containing three major clades, although some proposed subgenera are not. Some progress is being made using molecular phylogenetic methods, and the internal transcribed spacer (ITS) region, including the 5.8S rDNA and the two spacers ITS1 and ITS2, is one of the more commonly used markers in the study of the differentiation of the Allium species.
Allium includes a number of taxonomic groupings previously considered separate genera (Caloscordum Herb., Milula Prain and Nectaroscordum Lindl.) Allium spicatum had been treated by many authors as Milula spicata, the only species in the monospecific genus Milula. In 2000, it was shown to be embedded in Allium.
|Amaryllidaceae: Subfamily Allioideae||
When Linnaeus formerly described the genus Allium in his Species Plantarum (1753), there were thirty species with this name. He placed Allium in a grouping he referred to as Hexandria monogynia (i.e. six stamens and one pistil) containing 51 genera in all.
Linnaeus originally grouped his 30 species into three alliances, e.g. Foliis caulinis planis. Since then, many attempts have been made to divide the growing number of recognised species into infrageneric subgroupings, initially as sections, and then as subgenera further divided into sections. For a brief history, see Li et al. (2010) The modern era of phylogenetic analysis dates to 1996. In 2006 Friesen, Fritsch, and Blattner described a new classification with 15 subgenera, 56 sections, and about 780 species based on the nuclear ribosomal gene internal transcribed spacers. Some of the subgenera correspond to the once separate genera (Caloscordum, Milula, Nectaroscordum) included in the Gilliesieae. The terminology has varied with some authors subdividing subgenera into Sections and others Alliances. The term Alliance has also been used for subgroupings within species, e.g. Allium nigrum, and for subsections.
Subsequent molecular phylogenetic studies have shown the 2006 classification is a considerable improvement over previous classifications, but some of its subgenera and sections are probably not monophyletic. Meanwhile, the number of new species continued to increase, reaching 800 by 2009, and the pace of discovery has not decreased. Detailed studies have focused on a number of subgenera, including Amerallium. Amerallium is strongly supported as monophyletic. Subgenus Melanocrommyum has also been the subject of considerable study (see below), while work on subgenus Allium has focussed on section Allium, including Allium ampeloprasum, although sampling was not sufficient to test the monophyly of the section.
The major evolutionary lineages or lines correspond to the three major clades. Line one (the oldest) with three subgenera is predominantly bulbous, the second, with five subgenera and the third with seven subgenera contain both bulbous and rhizomatous taxa.
Evolutionary lines and subgeneraEdit
|Cladogram of evolutionary lines in Allium|
- First evolutionary line
- Second evolutionary line
- Caloscordum (Herb.) R. M. Fritsch Type: Allium neriniflorum (1/3)
- Anguinum (G. Don ex Koch) N. Friesen Type: Allium victorialis (1/12)
- Porphyroprason (Ekberg) R. M. Fritsch Type: Allium oreophilum (1/1)
- Vvedenskya (Kamelin) R. M. Fritsch Type: Allium kujukense (1/1)
- Melanocrommyum (Webb et Berthel.) Rouy Type: Allium nigrum (20/160)
- Third evolutionary line
- Butomissa (Salisb.) N. Friesen Type: Allium ramosum (2/4) fragrant garlic
- Cyathophora R. M. Fritsch Type: Allium cyathophorum (3/5)
- Rhizirideum (G. Don ex Koch) Wendelbo s.s Type: Allium senescens (5/37)
- Allium L. Type: Allium sativum (15/300) garlic
- Reticulatobulbosa (Kamelin) N. Friesen Type: Allium lineare (5/80)
- Polyprason Radic Type: Allium moschatum (4/50)
- Cepa (Mill.) Radic ́ Type: Allium cepa (5/30) onion, garden onion, bulb onion, common onion
First evolutionary lineEdit
Although this lineage consists of three subgenera, nearly all the species are attributed to subgenus Amerallium, the third largest subgenus of Allium. The lineage is considered to represent the most ancient line within Allium, and to be the only lineage that is purely bulbous, the other two having both bulbous and rhizomatous taxa. Within the lineage Amerallium is a sister group to the other two subgenera (Microscordum+Nectaroscordum).
Second evolutionary lineEdit
Nearly all the species in this lineage of five subgenera are accounted for by subgenus Melanocrommyum, which is most closely associated with subgenera Vvedenskya and Porphyroprason, phylogenetically. These three genera are late-branching whereas the remaining two subgenera, Caloscordum and Anguinum, are early branching.
Third evolutionary lineEdit
The third evolutionary line contains the most number of sections (seven) and also the largest subgenus of the genus Allium, subgenus Allium which includes the type species of the genus, Allium sativum. This subgenus also contains the majority of the species in the line. Within the lineage the phylogeny is complex. Two small subgenera Butomissa and Cyathophora form a sister clade to the remaining five subgenera, with Butomissa as the first branching group. Amongst the remaining five subgenera, Rhizirideum forms a medium-sized subgenus that is the sister to the other four larger subgenera. However, they may not be monophyletic.
Distribution and habitatEdit
The majority of Allium species are native to the Northern Hemisphere, being spread throughout the holarctic region, from dry subtropics to the boreal zone, but predominantly in Asia. Of the latter 138 species occur in China, about a sixth of all species, representing five subgenera. A few species are native to Africa and Central and South America. A single known exception, Allium dregeanum occurs in the Southern Hemisphere (South Africa). There are two centres of diversity, a major one from the Mediterranean Basin to Central Asia and Pakistan, while a minor one is found in western North America. The genus is especially diverse in the eastern Mediterranean.
Species grow in various conditions from dry, well-drained mineral-based soils to moist, organic soils; most grow in sunny locations, but a number also grow in forests (e.g., A. ursinum), or even in swamps or water.
Various Allium species are used as food plants by the larvae of the leek moth and onion fly as well as some Lepidoptera including cabbage moth, common swift moth (recorded on garlic), garden dart moth, large yellow underwing moth, nutmeg moth, setaceous Hebrew character moth, turnip moth and Schinia rosea, a moth that feeds exclusively on Allium species.
Many Allium species and hybrids are cultivated as ornamentals. These include A. cristophii and A. giganteum, which are used as border plants for their ornamental flowers, and their "architectural" qualities. Several hybrids have been bred, or selected, with rich purple flowers. A. hollandicum 'Purple Sensation' is one of the most popular and has been given an Award of Garden Merit (H4). These ornamental onions produce spherical umbels on single stalks in spring and summer, in a wide variety of sizes and colours, ranging from white (Allium 'Mont Blanc'), blue (A. caeruleum), to yellow (A. flavum) and purple (A. giganteum). By contrast, other species (such as invasive A. triquetrum and A. ursinum) can become troublesome garden weeds.
The genus includes many economically important species. These include onions (A. cepa), French shallots (A. oschaninii), leeks (A. ampeloprasum), scallions (various Allium species), and herbs such as garlic (A. sativum) and chives (A. schoenoprasum). Some have been used as traditional medicines.
- "1793 illustration from William Woodville: "Medical botany", London, James Phillips, 1793, Vol. 3, Plate 168: Allium sativum (Garlic). Hand-coloured engraving". Archived from the original on 2011-02-17. Retrieved 2015-04-07.
- Linnaeus 1753, Allium I pp. 294–301
- Kew World Checklist of Selected Plant Families
- Quattrocchi 1999, vol. 1 p. 91.
- Gledhill, David (2008). "The Names of Plants". Cambridge University Press. ISBN 9780521866453 (hardback), ISBN 9780521685535 (paperback). pp 43
- Allium In: Index Nominum Genericorum. In: Regnum Vegetabile (see External links below).
- Eric Block (2010). Garlic and Other Alliums: The Lore and the Science. Royal Society of Chemistry. ISBN 978-0-85404-190-9.
- Dilys Davies (1992). Alliums: The Ornamental Onions. Timber Press. ISBN 0-88192-241-2.
- Knud Rahn. 1998. "Alliaceae" pages 70-78. In: Klaus Kubitzki (editor). The Families and Genera of Vascular Plants volume III. Springer-Verlag: Berlin;Heidelberg, Germany. ISBN 978-3-540-64060-8
- The Plant List, for genus Allium
- Chase, M.W.; Reveal, J.L. & Fay, M.F. (2009). "A subfamilial classification for the expanded asparagalean families Amaryllidaceae, Asparagaceae and Xanthorrhoeaceae". Botanical Journal of the Linnean Society. 161 (2): 132–136. doi:10.1111/j.1095-8339.2009.00999.x.
- James L. Brewster, "Onions and Other Alliums" (Wallingford: CABI Publishing, 2008)
- Haim D. Rabinowitch, Leslie Currah, "Allium Crop Sciences: Recent Advances" (Wallingford: CABI Publishing, 2002)
- Penny Woodward, "Garlic and Friends: The History, Growth and Use of Edible Alliums" (South Melbourne: Hyland House, 1996)
- Frodin, David G. (2004). "History and concepts of big plant genera". Taxon. 53 (3): 753–776. doi:10.2307/4135449.
- Wheeler et al 2013.
- "Allium in Flora of China @". Efloras.org. Retrieved 2012-12-11.
- "Allium in Flora of North America @". Efloras.org. Retrieved 2012-12-11.
- Peterson, R.P. 1982. A Field Guide to Edible Wild Plants: Eastern and central North America. Houghton Mifflin, Boston.
- Gibbons, E. 1962. Stalking the wild asparagus. David McKay, New York.
- Deniz et al 2015.
- Li et al. 2010.
- Friesen et al 2000.
- Linnaeus Sexual System 2015.
- Linnaeus 1753, Hexandria monogynia I pp. 285–332.
- von Berg et al 1996.
- Friesen, Fritsch & Blattner 2006.
- Sykorova 2006.
- Fritsch et al 2010.
- Nguyen et al 2008.
- Hirschegger et al 2010.
- Tzanoudakis & Trigas 2015.
- Gualtiero Simonetti (1990). Stanley Schuler, ed. Simon & Schuster's Guide to Herbs and Spices. Simon & Schuster, Inc. ISBN 0-671-73489-X.
- Anthony Huxley, Mark Griffiths, and Margot Levy (1992). The New Royal Horticultural Society Dictionary of Gardening. The Macmillan Press,Limited: London. The Stockton Press: New York. ISBN 978-0-333-47494-5 (set).
- Brickell, Christopher (Editor-in-chief),The Royal Horticultural Society A–Z Encyclopedia of Garden Plants, p.95, Dorling Kindersley, London, 1996, ISBN 0-7513-0303-8
- RHS Plant Finder 2009–2010, p68, Dorling Kindersley, London, 2009, ISBN 978-1-4053-4176-9
- Lloyd, Christopher & Rice, Graham, (1991) Garden Flowers From Seed, p45, Viking, ISBN 0-670-82455-0
- "RHS Plantfinder - Allium 'Ambassador'". Royal Horticultural Society. 2016. Retrieved 5 January 2018.
- "RHS Plantfinder - Allium 'Beau Regard'". Royal Horticultural Society. 1995. Retrieved 5 January 2018.
- "RHS Plantfinder - Allium 'Gladiator'". Royal Horticultural Society. 1995. Retrieved 5 January 2018.
- "RHS Plantfinder - Allium 'Globemaster'". Royal Horticultural Society. 1995. Retrieved 5 January 2018.
- "RHS Plantfinder - Allium 'Round and Purple'". Royal Horticultural Society. 2016. Retrieved 5 January 2018.
- Cope RB. Toxicology Brief: Allium species poisoning in dogs and cats. Veterinary Medicine 2005
- Block, Eric (2009). Garlic and other alliums: the lore and the science. Cambridge: Royal Society of Chemistry. ISBN 978-0-85404-190-9.
- Brewster, J. L. (2008). Onions and Other Alliums. CABI Publishing. ISBN 978-1-84593-399-9.
- Davies, D. (1992). Alliums: The Ornamental Onions. Timber Press. ISBN 0-88192-241-2.
- Linnaeus, C. (1753). Species Plantarum: exhibentes plantas rite cognitas, ad genera relatas, cum differentiis specificis, nominibus trivialibus, synonymis selectis, locis natalibus, secundum systema sexuale digestas. Stockholm: Impensis Laurentii Salvii. Retrieved 27 September 2016.
- Rabinowitch, H. D.; Currah, L. (2002). Allium Crop Sciences: Recent Advances. CABI Publishing. ISBN 0-85199-510-1.
- Quattrocchi, Umberto (1999). CRC world dictionary of plant names: common names, scientific names, eponyms, synonyms, and etymology. Boca Raton, FL: CRC Press. ISBN 978-0-8493-2673-8.
- Woodward, P. (1996). Garlic and Friends: The History, Growth and Use of Edible Alliums. Hyland House. ISBN 1-86447-009-7.
- Fritsch, RM; Friesen, N. Evolution, domestication and taxonomy (PDF). pp. 5–30., in Rabinowitch & Currah (2002)
- Banfi, Enrico; Galasso, Gabriele; Soldano, Adriano (1 September 2011). "Notes on systematics and taxonomy for the Italian vascular flora. 2". Natural History Sciences (Milan). 152 (2): 85–106. doi:10.4081/nhs.2011.85.
- von Berg, Gerlinde Linne; Samoylov, Alexander; Klaas, Manfred; Hanelt, Peter (September 1996). "Chloroplast DNA restriction analysis and the infrageneric grouping of Allium (Alliaceae)". Plant Systematics and Evolution. 200 (3–4): 253–261. doi:10.1007/bf00984939.
- Choi, Hyeok Jae; Giussani, Liliana M.; Jang, Chang Gee; Oh, Byoung Un; Cota-Sánchez, J. Hugo (June 2012). "Systematics of disjunct northeastern Asian and northern North American Allium (Amaryllidaceae)". Botany. 90 (6): 491–508. doi:10.1139/b2012-031.
- Deniz, İsmail Gökhan; Genç, İlker; Sarı, Duygu (9 June 2015). "Morphological and molecular data reveal a new species of Allium (Amaryllidaceae) from SW Anatolia, Turkey". Phytotaxa. 212 (4): 283–292. doi:10.11646/phytotaxa.212.4.4.
- Dubouzet, J. G.; Shinoda, K.; Murata, N. (17 December 1997). "Phylogeny of Allium L. subgenus Rhizirideum (G. Don ex Koch) Wendelbo according to dot blot hybridization with randomly amplified DNA probes". TAG Theoretical and Applied Genetics. 95 (8): 1223–1228. doi:10.1007/s001220050685.
- Fragman-Sapir, Ori; Fritsch, Reinhard M. (2011). "New species of Allium sect. Melanocrommyum from the eastern Mediterranean" (PDF). Herbertia. 65: 31–50.
- N. Friesen, R. Fritsch and K. Bachmann. Hybrid origin of some ornamentals of Allium subgenus Melanocrommyum verified with GISH and RAPD. TAG Theoretical and Applied Genetics. Volume 95, Number 8, December, 1997
- Friesen, Nikolai; Fritsch, Reinhard M.; Pollner, Sven; Blattner, Frank R. (2000). "Molecular and Morphological Evidence for an Origin of the Aberrant Genus Milula within Himalayan Species of Allium (Alliacae)". Molecular Phylogenetics and Evolution. 17 (2): 209–218. doi:10.1006/mpev.2000.0844. PMID 11083935.
- Friesen, N; Fritsch, RM; Blattner, Frank R (2006). "Phylogeny and new intrageneric classification of Allium (Alliaceae) based on nuclear ribosomal DNA ITS sequences" (PDF). Aliso. 22: 372–395. Retrieved 13 October 2015.
- Fritsch, RM; Gurushidze, M; Jedelská, J; Keusgen, M (2006). "More than a pretty face - ornamental "drumstick onions" of Allium subg. Melanocrommyum are also potential medicinal plants". Herbertia. 60: 26–59.
- Fritsch, RM; Blattner, FR; Gurushidze, M (2010). "New classification of Allium L. subg. Melanocrommyum (Webb & Berthel) Rouy (Alliaceae) based on molecular and morphological characters". Phyton. 49: 145–220. Retrieved 13 October 2015.
- Gurushidze, Maia; Fuchs, Jörg; Blattner, Frank R. (1 March 2012). "The Evolution of Genome Size Variation in Drumstick Onions (Allium subgenus Melanocrommyum)". Systematic Botany. 37 (1): 96–104. doi:10.1600/036364412X616675.
- Hirschegger, Pablo; Jaške, Jernej; Trontelj, Peter; Bohanec, Borut (2010). "Origins of Allium ampeloprasum horticultural groups and a molecular phylogeny of the section Allium (Allium; Alliaceae)"". Molecular Phylogenetics and Evolution. 54 (2): 488–497. doi:10.1016/j.ympev.2009.08.030. PMID 19733249.
- Huang, De-Qing; Yang, Jing-Tian; Zhou, Chun-Jing; Zhou, Song-Dong; He, Xing-Jin (21 December 2013). "Phylogenetic reappraisal of Allium subgenus Cyathophora (Amaryllidaceae) and related taxa, with a proposal of two new sections". Journal of Plant Research. 127 (2): 275–286. doi:10.1007/s10265-013-0617-8.
- İpek, Meryem; İpek, Ahmet; SIMON, Philipp W. (2014). "Testing the utility of matK and ITS DNA regions for discrimination of Allium species". Turkish Journal of Botany. 38: 203–212. doi:10.3906/bot-1308-46.
- Li, R. J.; Shang, Z. Y.; Cui, T. C.; Xu, J. M. (1996). "Studies on karyotypes and phylogenetic relationship of Allium sect. Caloscordum (Liliaceae) from China". Acta Phytotax. Sin. 34: 288–295. [In Chinese.]
- Li, Q.-Q.; Zhou, S.-D.; He, X.-J.; Yu, Y.; Zhang, Y.-C.; Wei, X.-Q. (21 October 2010). "Phylogeny and biogeography of Allium (Amaryllidaceae: Allieae) based on nuclear ribosomal internal transcribed spacer and chloroplast rps16 sequences, focusing on the inclusion of species endemic to China". Annals of Botany. 106 (5): 709–733. doi:10.1093/aob/mcq177. PMC 2958792. PMID 20966186.
- Nguyen, Nhu H.; Driscoll, Heather E.; Specht, Chelsea D. (2008). "A molecular phylogeny of the wild onions (Allium; Alliaceae) with a focus on the western North American center of diversity". Molecular Phylogenetics and Evolution. 47 (3): 1157–1172. doi:10.1016/j.ympev.2007.12.006. PMID 18226928.
- A. Samoylov, N. Friesen, S. Pollner, P. Hanelt. Use of chloroplast DNA polymorphisms for the phylogenetic study of Allium subgenus Amerallium and subgenus Bromatorrhiza (Alliaceae) II. Feddes Repertorium Volume 110 Issue 1–2, Pages 103–109, 1999
- Seregin, Alexey P.; Anačkov, Goran; Friesen, Nikolai (May 2015). "Molecular and morphological revision of the Allium saxatile group (Amaryllidaceae): geographical isolation as the driving force of underestimated speciation". Botanical Journal of the Linnean Society. 178 (1): 67–101. doi:10.1111/boj.12269.
- Sykorova, E.; Fajkus, J.; Meznikova, M.; Lim, K. Y.; Neplechova, K.; Blattner, F. R.; Chase, M. W.; Leitch, A. R. (1 June 2006). "Minisatellite telomeres occur in the family Alliaceae but are lost in Allium". American Journal of Botany. 93 (6): 814–823. doi:10.3732/ajb.93.6.814. PMID 21642143. Retrieved 8 January 2015.
- Tzanoudakis, Dimitris; Trigas, Panayiotis (12 March 2015). "Allium occultum, a new species of A. sect. Codonoprasum (Amaryllidaceae) from Skiros Island (W Aegean, Greece)". Phytotaxa. 202 (2): 135. doi:10.11646/phytotaxa.202.2.5.
- Wheeler, E. J.; Mashayekhi, S.; McNeal, D. W.; Columbus, J. T.; Pires, J. C. (26 March 2013). "Molecular systematics of Allium subgenus Amerallium (Amaryllidaceae) in North America". American Journal of Botany. 100 (4): 701–711. doi:10.3732/ajb.1200641.
- Zubaida Yousaf; Zabta Khan Shinwari; Rizwana ALEEM Qureshi; Mir Ajab Khan; Syed Shahinshah Gilani (2004). "Can complexity of the genus Allium L., be resolved through some numerical techniques?" (PDF). Pak. J. Bot. 36 (3): 487–501. Retrieved 28 January 2015.
- "Linnaeus Sexual System". CronkLab. Biodiversity Research Centre, University of British Columbia. Retrieved 26 January 2015.
- "Allium". World Checklist of Selected Plant Families. Royal Botanic Gardens, Kew. Retrieved 9 January 2017.
- Pacific Bulb Society: Allium
|Wikimedia Commons has media related to Allium.|
|Wikispecies has information related to Allium|