Allium sanbornii

Allium sanbornii
Allium sanbornii var. congdonii [1]
Conservation status
Vulnerable  (NatureServe) [2]
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Monocots
Order:	Asparagales
Family:	Amaryllidaceae
Subfamily:	Allioideae
Genus:	Allium
Subgenus:	A. subg. Amerallium
Species:	A. sanbornii
Binomial name
Allium sanbornii Alph.Wood
Synonyms [3]
Allium intactum Jeps. Allium sanbornii subsp. intactum(Jeps.) Traub

Allium sanbornii is a North American species of wild onion known by the common name Sanborn's onion. ^[3] It is native to northern California and southwestern Oregon. ^[4] It grows in the serpentine soils of the southern Cascade Range and northern Sierra Nevada foothills. ^{[5] [6]}

Allium sanbornii produces a reddish-brown bulb up to about 2.5 cm (1 in) long. Scape up to 60 cm (24 in) 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. ^{[6] [7] [8]}

Varieties ^{[3] [9]}

• Allium sanbornii var. congdoniiJeps. - 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 ^{[3] [10]}

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

References

1. photo of herbarium specimen at Jepson Herbarium, University of California @ Berkeley, collected in 2005 in Nevada County, California
2. "NatureServe Explorer 2.0".
3. Kew World Checklist of Selected Plant Families
4. Biota of North America Program 2014 county distribution map
5. USDA Plants Profile
6. Flora of North America, Allium sanbornii
7. Jepson Manual Treatment
8. Wood, Alphonso. 1868. Proceedings of the Academy of Natural Sciences of Philadelphia 20(6): 171.
9. Calflora Taxon Report 229, Allium sanbornii Alph. Wood, Sanborn's onion
10. Denison, S.S. & McNeal, Dale W. 1989. Madroño 36(2): 127-128