Allium amplectens, or the narrowleaf onion, is a flowering plant of the Liliaceae family.
- Allium acuminatum Hook. var. gracile
- Allium attenuifolium Kellogg
- Allium attenuifolium Kellogg var. monospermum
- Allium monospermum Jepson
- Allium occidentale Gray
- Allium serratum S. Watson
- Kingdom Plantae – Plants
- Subkingdom Tracheobionta – Vascular plants
- Superdivision Spermatophyta – Seed plants
- Division Magnoliophyta – Flowering plants
- Class Liliopsida – Monocotyledons
- Subclass - Liliidae
- Order - Liliales
- Family Liliaceae – Lily family
- Genus Allium L. – onion
- Species Allium amplectens Hook. – narrowleaf onion
Perennial growing from bulbs sometimes clustered. Stem somewhat cylindrical, 15-50 cm tall. 2-4 slender leaves growing from the scape. Almost spherical umbels of many white or pink flowers. Tepals 6; pedicals slender 1-2 times length of tepals. Stamens 6 and as long as the tepals.  
California, Oregon, Washington, and British Columbia.
Open or wooded with clay soils http://ucjeps.berkeley.edu/cgi-bin/get_JM_treatment.pl?8349,8354,8357
Seed sample from: 2011
Average Measurement: 2.1 x 1.7 x 1.7
Measurement Range: L: 1.8 - 2.5, W: 1.5 - 1.8, D: 1.3 - 1.75
Shape: Seeds narrow at hilum end, broadening at opposite apex.
Color: Seeds black. Hilum beige to white.
Surface: Seed’s most distinct feature is extreme puckering or wrinkling. Some seeds have concave pitting, ridging, or some net veined patterns. Seeds roughly textured and matte.
Basic Explanations and Assumptions:
The dimensions for the seeds are length x width x depth. The location of the hilum is used as the base of the seed, and the length is measured from hilum to the opposite apex. Where a style is present, the length is measured from the hilum to the bottom of the style. Width is measured at a right angle to the length at the widest part. Depth is measured at a right angle to the intersection of height and width lines.
Measurements included are the mean average for each measurement of ten separate seeds.
All measurements in millimeters unless otherwise noted.