Allium sanbornii

{{Short description|Species of flowering plant}}

{{Speciesbox

| taxon = Allium sanbornii

| parent = Allium subg. Amerallium

| image = Allium sanbornii congdonii.jpg

| image_caption = Allium sanbornii var. congdoniiphoto of herbarium specimen at Jepson Herbarium, University of California @ Berkeley, collected in 2005 in Nevada County, California

| authority = Alph.Wood

|name=Allium sanbornii

|synonyms_ref=

|synonyms=

• Allium intactum Jeps.
• Allium sanbornii subsp. intactum (Jeps.) Traub

| status = G3

| status_system = TNC

| status_ref = {{cite web | url=https://explorer.natureserve.org/Taxon/ELEMENT_GLOBAL.2.155699 | title=NatureServe Explorer 2.0 }}

}}

Allium sanbornii is a North American species of wild onion known by the common name Sanborn's onion.[http://apps.kew.org/wcsp/namedetail.do?name_id=296488 Kew World Checklist of Selected Plant Families] It is native to northern California and southwestern Oregon.[http://bonap.net/MapGallery/County/Allium%20sanbornii.png Biota of North America Program 2014 county distribution map] It grows in the serpentine soils of the southern Cascade Range and northern Sierra Nevada foothills.[https://plants.usda.gov/java/profile?symbol=ALSA USDA Plants Profile][http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=242101398 Flora of North America, Allium sanbornii]

Allium sanbornii produces a reddish-brown bulb up to about {{convert|2.5|cm|in|0|abbr=on}} long. Scape up to {{convert|60|cm|in|abbr=on}} long, bearing a single cylindrical leaf which is about the same length. The umbel contains as many as 150 small flowers, each with tepals less than a centimeter long, pink to white with darker red midveins. Anthers are yellow or purple; pollen yellow or white.[http://ucjeps.berkeley.edu/cgi-bin/get_JM_treatment.pl?8349,8354,8411 Jepson Manual Treatment][https://www.biodiversitylibrary.org/page/9768320#page/179/mode/1up Wood, Alphonso. 1868. Proceedings of the Academy of Natural Sciences of Philadelphia 20(6): 171.]

;Varieties[http://www.calflora.org/cgi-bin/species_query.cgi?where-calrecnum=229 Calflora Taxon Report 229, Allium sanbornii Alph. Wood, Sanborn's onion ]

• Allium sanbornii var. congdonii Jeps. - from Nevada County to Mariposa County
• Allium sanbornii var. sanbornii - from Shasta County to Mariposa County in California; Jackson + Josephine Counties in Oregon

;formerly includedDenison, S.S. & McNeal, Dale W. 1989. Madroño 36(2): 127-128

• Allium sanbornii var. jepsonii Ownbey & Aase ex Traub, now called Allium jepsonii (Ownbey & Aase ex Traub) S.S.Denison & McNeal
• Allium sanbornii var. tuolumnense Ownbey & Aase ex Traub, now called Allium tuolumnense (Ownbey & Aase ex Traub) S.S.Denison & McNeal