Allium sanbornii explained

Allium sanbornii is a North American species of wild onion known by the common name Sanborn's onion.^[1] It is native to northern California and southwestern Oregon.^[2] It grows in the serpentine soils of the southern Cascade Range and northern Sierra Nevada foothills.^{[3] [4]}

Allium sanbornii produces a reddish-brown bulb up to about 2.50NaN0 long. Scape up to 60cm (20inches) 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.^{[4] [5] [6]}

Varieties^{[1] [7]}

• 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 included^{[1] [8]}

• 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

Notes and References

1. http://apps.kew.org/wcsp/namedetail.do?name_id=296488 Kew World Checklist of Selected Plant Families
2. http://bonap.net/MapGallery/County/Allium%20sanbornii.png Biota of North America Program 2014 county distribution map
3. http://plants.usda.gov/java/profile?symbol=ALSA USDA Plants Profile
4. http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=242101398 Flora of North America, Allium sanbornii
5. http://ucjeps.berkeley.edu/cgi-bin/get_JM_treatment.pl?8349,8354,8411 Jepson Manual Treatment
6. 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.
7. http://www.calflora.org/cgi-bin/species_query.cgi?where-calrecnum=229 Calflora Taxon Report 229, Allium sanbornii Alph. Wood, Sanborn's onion
8. Denison, S.S. & McNeal, Dale W. 1989. Madroño 36(2): 127-128