page_title: Taxonomy of Allium
section_title: Section Bromatorrhiza
hierarchical_section_title: Taxonomy of Allium / Subdivision / Evolutionary lines and subgenera / First evolutionary line / Subgenus Amerallium / Section Bromatorrhiza
caption_attribution_description: English: Allium wallichii in Gothenburg Botanical Garden. Plant id: 1993-0934 s Z -- Drake (CLD 1500)
context_page_description: The precise taxonomy of the genus Allium is still poorly understood with incorrect descriptions being widespread. With over 850 species distributed over the Northern hemisphere Allium is the sole genus in the Allieae, one of four tribes of subfamily Allioideae. New species continue to be described and Allium is both highly variable and 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. 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 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.
context_section_description: Section Bromatorrhiza Ekberg
  Allium hookeri Thwaites
  Allium macranthum Baker (Syn. Allium oviflorum Regel)
  Allium pendulinum Ten.
  Allium wallichii Kunth (Syn. Allium polyastrum Diels, Allium wallichianum Steud. nom. nud.) Type
caption: Bromatorrhiza: A. wallichii
exif: {"Image Make": "Canon", "Image Model": "Canon EOS 6D", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "Picasa", "Image DateTime": "2015:10:18 11:00:49", "Image Artist": "Picasa", "Image YCbCrPositioning": "Centered", "Image ExifOffset": "218", "GPS GPSVersionID": "[2, 3, 0, 0]", "GPS GPSLatitudeRef": "N", "GPS GPSLatitude": "[57, 40, 10383/250]", "GPS GPSLongitudeRef": "E", "GPS GPSLongitude": "[11, 57, 8349/500]", "GPS GPSAltitudeRef": "0", "GPS GPSAltitude": "379/5", "GPS GPSTimeStamp": "[12, 38, 28]", "GPS GPSSatellites": "12", "GPS GPSStatus": "A", "GPS GPSMeasureMode": "3", "GPS GPSDOP": "3", "GPS GPSMapDatum": "WGS-84", "GPS GPSDate": "2015:08:30", "Image GPSInfo": "8708", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "9084", "Thumbnail JPEGInterchangeFormatLength": "4714", "EXIF ExposureTime": "1/200", "EXIF FNumber": "8", "EXIF ExposureProgram": "Aperture Priority", "EXIF ISOSpeedRatings": "400", "EXIF SensitivityType": "Recommended Exposure Index", "EXIF RecommendedExposureIndex": "400", "EXIF ExifVersion": "0230", "EXIF DateTimeOriginal": "2015:08:30 14:38:34", "EXIF DateTimeDigitized": "2015:08:30 14:38:34", "EXIF ComponentsConfiguration": "YCbCr", "EXIF ShutterSpeedValue": "12927/1696", "EXIF ApertureValue": "6", "EXIF ExposureBiasValue": "0", "EXIF MeteringMode": "Pattern", "EXIF Flash": "Flash did not fire, compulsory flash mode", "EXIF FocalLength": "100", "EXIF SubSecTime": "00", "EXIF SubSecTimeOriginal": "00", "EXIF SubSecTimeDigitized": "00", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "5496", "EXIF ExifImageLength": "3670", "Interoperability InteroperabilityIndex": "R98", "Interoperability InteroperabilityVersion": "[48, 49, 48, 48]", "Interoperability RelatedImageWidth": "5496", "Interoperability RelatedImageLength": "3670", "EXIF InteroperabilityOffset": "8654", "EXIF FocalPlaneXResolution": "1368000/359", "EXIF FocalPlaneYResolution": "912000/239", "EXIF FocalPlaneResolutionUnit": "2", "EXIF CustomRendered": "Normal", "EXIF ExposureMode": "Auto Exposure", "EXIF WhiteBalance": "Auto", "EXIF FocalLengthIn35mmFilm": "99", "EXIF SceneCaptureType": "Standard", "EXIF ImageUniqueID": "4c1126adf005cd950bdc357afbe4b7eb", "EXIF CameraOwnerName": "", "EXIF BodySerialNumber": "183020004530", "EXIF LensSpecification": "[100, 100, 0, 0]", "EXIF LensModel": "EF100mm f/2.8 Macro USM", "EXIF LensSerialNumber": "0000000000"}