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• Physical Description
• Distribution
• Growth
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Taxonomy

Physical Description

Family Liliaceae:

Herbs perennial, with a rhizome, bulb, or corm, rarely shrubby or treelike. Leaves basal and/or cauline, alternate, opposite, or whorled, parallel or rarely reticulate veined. Inflorescence a raceme, panicle, spike, umbel, reduced panicle, or other, or flowers solitary. Flowers bisexual, rarely unisexual, actinomorphic, rarely zygomorphic; bracts present or absent; bracteoles present or absent. Perianth usually corollalike, 6-merous, rarely 4- or 8-merous, in 2 whorls; segments free (tepals) or united. Stamens 6, rarely 3, 4, or 8, inserted opposite perianth segments; filaments free or adnate to perianth, rarely connate into a corona; anthers usually 2-loculed, basifixed or dorsifixed and versatile, introrse, latrorse, or extrorse, dehiscing usually by vertical slits. Carpels usually connate for most or all of their length, rarely only at base; ovary superior, rarely semi-inferior, 3-loculed, rarely 2- or 4-loculed, with axile placentae, or rarely 1-loculed with a parietal placenta; ovules usually anatropous. Nectaries septal, perigonal, or absent. Fruit a capsule or berry. Seeds with abundant endosperm and small embryo.

About 250 genera and 3500 species: worldwide, especially in temperate and subtropical regions; 57 genera (three endemic, two introduced) and 726 species (379 endemic, 11 introduced) in China.^[1]

Genus Allium:

Herbs, perennial, scapose, from tunicate bulbs, with onion odor and taste. Bulbs solitary or clustered, dividing at base, or on rhizomes, reforming annually; outer coats generally brown or gray, smooth, fibrous, or with cellular reticulation (generally important in identification) ; inner coats membranous. Leaves generally withering from tip by anthesis, usually persistent, 1-12, basal; blade usually linear, terete, channeled, or flat (carinate in A. sativum, A. praecox, A. tuberosum, A. rotundum, A. neapolitanum, A. triquetrum, A. unifolium, and A. lacunosum), straight or ± falcate (coiled or circinate in A. nevadense and A. atrorubens), broader in A. victorialis and A. tricoccum, not petiolate (except in A. tricoccum and A. victorialis) . Scape usually persistent, terete or flattened. Inflorescences umbellate, flowering centripetally (centrifugally in A. schoenoprasum), sometimes replaced totally or partially by bulbils, subtended by spathe bracts; bracts conspicuous, ± fused, usually 3+-veined, equaling pedicel except in some introduced species, membranous. Flowers erect (pendent in A. triquetrum) ; tepals 6, in 2 similar whorls, ± distinct, petallike, usually becoming becoming dry and persisting; stamens 6, epipetalous; filaments in all but 1 native species broad at base, fused into ring (some introduced species and A. victorialis appendaged), linear, generally glabrous (A. rotundum and A. hoffmanii papillose to ciliate proximally) ; anthers and pollen variously colored; ovary superior, 3-lobed, sometimes crested with processes, 3-locular, usually 2 ovules per locule (6-8 in A. nigrum), crest processes 3 or 6, smooth except in A. haematochiton, A. sharsmithiae, and A. lacunosum; style 1; stigma capitate to ± 3-lobed; pedicel erect or spreading (lax in A. triquetrum) . Fruits capsular, dehiscence loculicidal. Seeds black, obovoid, finely cellular-reticulate, cells smooth or minutely roughened, with 1-8 papillae, without caruncle except in A. triquetrum. x = 7, 8, 9.

Species 550-700: mostly Northern Hemisphere.

As with many other genera in the Liliaceae sensu lato, Allium has been segregated into a separate family, Alliaceae, by most recent authors (R. Dahlgren et al. 1985; K. Rahn 1998; A. L. Takhtajan 1997; R. F. Thorne 1992) .Old World species of Allium are generally placed in subgenera and sections. Attempts to treat New World species similarly have gained less acceptance. H. P. Traub (1972) recognized subg. Amerallium, encompassing all of the x = 7 North American members of the genus.

P. Hanelt (1992) placed the Old World x = 7 species also in that subgenus, which includes all but three of the North American species (A. schoenoprasum, A. tricoccum, and A. victorialis), which have x = 8. These latter species have been placed in subg. Rhizirideum (P. Hanelt 1992) . Resolution of the problematic subgeneric and sectional relationships among Old and New World species will require much more extensive molecular and phylogenetic analysis of the genus. The characters used in the construction of the following key are the best that have been discovered for this purpose. Many of these are subject to sometimes rather wide variation. It is anticipated, therefore, that it can be used successfully only with considerable understanding of the natural units involved, their distribution, and comparison with descriptions and accurately named specimens. The Allium bulb consists of a series of leaf bases, some with blades, others without, surrounding an apical meristem. The leaf bases are replaced annually as the meristem forms a new (renewal) bulb. Often the meristem will branch, resulting in two or more bulbs being formed from a single parent bulb (increase bulbs) . In addition several types of rhizomes are formed in Allium. In some cases (e.g., A. validum) bulbs form atop a thick, iris-like rhizome that produces new bulbs in succeeding years. In other cases (e.g., A. bolanderi, A. campanulatum, and A. unifolium) each bulb produces one or more rhizomes that in turn produce a terminal renewal or increase bulb. There is variation even in this type of rhizome. In some species (e.g., A. bolanderi and A. unifolium) the bulb producing the rhizomes disappears during the development of the rhizomes and new bulbs except for the roots, which remain active until the new bulbs mature and become dormant. In others (e.g., A. campanulatum) the bulb produces a number of very short rhizomes around the roots, each of which develops a very small terminal bulbel. At the same time, the parent bulb remains intact and produces a renewal bulb, or may divide to produce two or more large increase bulbs. As a result, specimens with this type of rhizome will have one or more large bulbs with a number of much smaller bulbels among the roots. The underground parts of Allium are often critical for successful identification, and every effort should always be made to collect them. The €œdirty€� brown or gray coats surrounding the bulbs are the only source for the cellular-reticulation patterns referred to in the key. These should be carefully collected and preserved as part of any specimen. Several Old World species (Allium ampeloprasum Linnaeus, A. cepa Linnaeus, A. oleraceum Linnaeus, A. sativum Linnaeus, A. nigrum Linnaeus), grown as foodstuffs or ornamentals, may be encountered and are certainly represented in North American herbaria. For this reason, these species have been included in the key. Some do not reproduce by seeds and probably should not be considered as truly naturalized in our flora, although they may persist for long periods at or near places where they have been planted. Additionally, over 52 species contained in this treatment are considered choice garden plants and are readily available through catalogues and garden centers. Locally, these species and possibly others grown as garden plants may escape and become established. It is inevitable, therefore, that numerous specimens of these escapees will be represented in North American herbaria and may muddy the boundaries of what is regarded to be the natural distribution. We have attempted in all cases to map what we consider to be the natural ranges of these species, based on the specimens examined over the years. Material falling outside these ranges may include these escapees and should be suspect.^[2]

Flowers: Bloom Period: June. • Flower Color: purple

Distribution

Growth

Culture: Space 9-12" apart.

Soil: Minimum pH: 6.6 • Maximum pH: 7.5

Sunlight: Sun Exposure: Full Sun.

Temperature: Cold Hardiness: 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b. (map)

Similar Species

Members of the genus Allium:

There are approximately 2,789 species, subspecies, varieties, forms, and cultivars in this genus. Here are just 100 of them: A. canadense ecristatum · A. fimbriatum mohavense · A. fimbriatum parryi · A. geyeri tenerum · A. roseum bulbiferum · A. sanbornii intactum · A. vineale compactum · A. 'Akbulak' · A. 'Ambassador' · A. 'Atlas' · A. 'Beau Regard' · A. 'Cristo' · A. 'Early Emperor' · A. 'Early Wight' · A. 'Fireworks Mix' (Ornamental Allium) · A. 'Firmament' (Ornamental Onion) · A. 'Gladiator' (Ornamental Onion) · A. 'Globemaster' (Allium) · A. 'Globus' · A. 'Guna' · A. 'Hair' (Hair Allium Allium) · A. 'His Excellency' · A. 'Laxton Sunset' · A. 'Lucy Ball' (Giant Allium) · A. 'Macropetalum' · A. 'Mars' (Ornamental Allium) · A. 'Moly' · A. 'Mont Blanc' · A. 'Mount Everest' (Flowering Onion) · A. 'Pinball Wizard' · A. 'Purple Giant' · A. 'Purple Pride' · A. 'Purple Surprise' · A. 'Purple Wight' · A. 'Renaissance' · A. 'Rien Poortvliet' · A. 'Round and Purple' · A. 'Silver Spring' (Drumstick Allium) · A. 'Sprint' · A. 'Stratos' (Flowering Onion) · A. 'Sugar Melt' (Ornamental Onion) · A. 'Summer Beauty' · A. 'Sweet Discovery' · A. 'Universe' · A. 'Valerie Finnis' · A. 'Violet Beauty' · A. 'White Giant' · A. 'World Cup' · A. a-bolosii · A. a-bolosii subsp. eivissanum · A. aaseae (Aase Onion) · A. abdelkaderi · A. ablyanthum · A. ablyanthum var. striolatum · A. abramsii (Abrams' Allium) · A. acetabulum 'Shinners' · A. acetabulum var. lavendulare · A. achaium · A. acidoides · A. aciphyllum · A. acre · A. acuminatum (Taper-Tip Onion) · A. acuminatum 'Album' · A. acutangulum · A. acutiflorum · A. acutum · A. adzharicum · A. aegaeum · A. aegilicum · A. aemulans · A. aestivale · A. aethusanum · A. aff. elburzense · A. affine · A. afghanicum · A. aflatuence · A. aflatunense (Flowering Onion) · A. aflatunense 'Alba' · A. aflatunense 'Purple Sensation' (Persian Flowering Onion) · A. afrum · A. agrigentinum · A. aitchisonii · A. akaka · A. akaka haemanthoides · A. alabasicum · A. alaicum · A. alaschanicum · A. alataviense · A. alatum · A. albanum · A. alberti · A. albescens · A. albidum · A. albidum caucasicum · A. albiflorum · A. albopilosum · A. Albopilosum 'Star of Persia' · A. albostellerianum · A. albotunicatum · A. albotunicatum albotunicatum

Bibliography

• Cronquist, A. and M. Ownbey. 1977. Allium. In: A. Cronquist et al. 1972+. Intermountain Flora. Vascular Plants of the Intermountain West, U.S.A. 5+ vols. New York and London. Vol. 6, pp. 508522. New York.
• Davies, D. 1992. Alliums, the Ornamental Onions. Portland.
• Denison, S. S. and D. W. McNeal Jr. 1989. A reevaluation of the Allium sanbornii (Alliaceae) complex.
• Hanelt, P. 1992. Infrageneric grouping of AlliumThe Gatersleban approach. In: P. Hanelt et al., eds. 1992. The Genus Allium: Taxonomic Problems and Genetic Resources.Gatersleben. Pp. 107123.
• Jacobsen, T. D. 1978. A Comparative Study of Three Alliances of the Genus Allium. Ph.D. thesis. Washington State University.
• Madroño 29: 7986. McNeal, D. W. Jr. 1992. A revision of the Allium fimbriatum (Alliaceae) complex. Aliso 13: 411426.
• Madroño 36: 122130. Gregory, M. et al. 1998. Nomenclator Alliorum: Allium Names and Synonyms, a World Guide. Kew.
• Mathew, B. 1996. A Review of Allium sect. Allium. Kew. McNeal, D. W. Jr. 1970. Comparative Studies of the Allium acuminatum Alliance. Ph.D. thesis. Washington State University.
• McNeal, D. W. Jr. 1982. Taxonomy of the Allium lacunosum complex (Liliaceae).
• McNeal, D. W. Jr. 1992b. A reappraisal of Allium cristatum (Alliaceae) and its allies. Madroño 39: 8389.
• Mingrone, L. V. 1968. A Comparative Study of the Allium falcifolium Alliance. Ph.D. thesis. Washington State University.
• Mortola, W. R. and D. W. McNeal Jr. 1985. Taxonomy of the Allium tribracteatum (Alliaceae) complex. Aliso 11: 2735.
• Ownbey, M. 1947. The genus Allium in Arizona. Res. Stud. State Coll. Wash. 15: 211232.
• Ownbey, M. 1950. The genus Allium in Idaho. Res. Stud. State Coll. Wash. 18: 339.
• Ownbey, M. 1950b. The genus Allium in Texas. Res. Stud. State Coll. Wash. 18: 181222.
• Ownbey, M. 1969b. Allium. In: C. L. Hitchcock et al. 19551969. Vascular Plants of the Pacific Northwest. 5 vols. Seattle. Vol. 1, pp. 739760.
• Ownbey, M. and H. C. Aase. 1955. Cytotaxonomic studies in Allium. I. The Allium canadense alliance. Res. Stud. State Coll. Wash., suppl. 1: 1106.
• Peterson, P. M., C. R. Annable, and L. H. Rieseberg. 1988. Systematic relationships and nomenclatural changes in the Allium douglasii complex (Alliaceae). Syst. Bot. 13: 207214.
• Wang Fa-tsuan & Tang Tsin, eds. 1978; 1980. Liliaceae. Fl. Reipubl. Popularis Sin. 15: 1--280; 14: 1--308.

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Notes

Contributors:

• Brands, S.J. (comp.) 1989-2006. Systema Naturae 2000. The Taxonomicon. Universal Taxonomic Services, Amsterdam, The Netherlands. Accessed April 19, 2007.

Identifiers:

• Zipcode Zoo Species Identifier: 1014585

Footnotes:

1. Xinqi Chen, Prof. Song-Yun Liang, Jie-mei Xu, David E. Boufford, Michael G. Gilbert, Rudolf V. Kamelin, Shoichi Kawano, Tetsuo Koyama, Elena V. Mordak, Junko Noguchi, Victor G. Soukup, Hiroshi Takahashi, Kamilla G. Tamanian, Minoru N. Tamura & Nicholas J. Turland "Liliaceae". in Flora of China Vol. 24 Page 73. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org.
2. Dale W. McNeal Jr. & T. D. Jacobsen "Allium". in Flora of North America Vol. 26 Page 53, 55, 224, 225, 259, 334, 336. Oxford University Press. Online at EFloras.org.