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Tapertip Onion, Hooker's Onion - Allium acuminatum


Family: Amaryllidaceae - Amaryllis family Genus Common Name: Onion Native Status: NativeMonocot Perennial Herb
Allium acuminatum - Tapertip Onion, Hooker's Onion. This is one of the western species in the Allium genus, being found in the 11 westernmost of the lower 48 states. It grows in dry areas at moderate elevations, typically blooming in April thru July. These were photographed along the lower sections of the Kleinschmidt Grade in Idaho.



Found in:
AZ, CA, CO, ID, MT, NM, NV, OR, UT, WA, WY

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Allium acuminatum

Distribution of Allium acuminatum in the United States and Canada:
USDA Plants Distribution Map temporarily unavailable.
Blue=Native; Grey=Introduced

Map from USDA Plants Database:
USDA, NRCS. 2017. The PLANTS Database (http://plants.usda.gov, 15 Dec 2017). National Plant Data Team, Greensboro, NC 27401-4901 USA.

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Site: Kleinschmidt Grade, Adams County, ID Date: 2011-June-18Photographer: Gerald C. Williamson
Nikon D7000
The 10 to 40 flowers form a looser inflorescence than many other Allium species. There are 6 tepals, the outer ones are broader than the inner ones, and are spreading, with the tips usually slightly recurved. The narrower inner tepals have more significantly recurved tips. The tips of especially the outer tepals taper to a long, sharp tip - the source of the Tapertip Onion common name and the accuminatum species epithet. The stamens will rarely extend past the tepals. The flowers are pink to purple, sometimes white.
Allium acuminatum

Site: Kleinschmidt Grade, Adams County, ID Date: 2011-June-18Photographer: Gerald C Williamson
Nikon D7000
The inflorescence of Allium accuminatum is on a single stem up to about 14 inches tall, several inches taller than the 2 or 3 narrow basal leaves. These leaves are “withering from tip by anthesis” according to Efloras.org, and as shown in this picture. I had to look up “anthesis” - time of full flowering.
Click on the photo for a larger image
Allium acuminatum

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All content except USDA Plants Database map Copyright Gerald C. Williamson 2017
Photographs Copyright owned by the named photographer