Plant Index


 
 
 

Allium cernuum

Allium cernuum Roth

nodding onion

Allium cernuum (Nodding Onion)
Image ID: 8024
Image by: Parkins, Grant Morrow
Image Collection: NCBG Digital Library

PLANT INDEX

ID_PLANT: ALCE2
SCIENTIFIC NAME: Allium cernuum
Include in WOTAS: 1
Publish to Web: 1
Last Modified: 2019-01-15

GENUS INDEX

GENUS CODE: ALLIU
GENUS SCIENTIFIC: Allium
GENUS AUTHORITY: L.
GENUS COMMON: Onion
GENUS SUMMARY: A genus of 500-700 species, herbs, of Eurasia, n. Africa, and North America (especially diverse in c. Asia).
GENUS IDENTIFICATION:
GENUS REFERENCES: Mathew (1996)=Z; Rahn in Kubitzki (1998a); McNeal & Jacobsen in FNA (2002a). [also see Nothoscordum]

FAMILY INDEX

FAMILY CODE: ALLIAC
FAMILY SCIENTIFIC: Alliaceae
FAMILY AUTHORITY: Borkhausen 1797
FAMILY COMMON: Onion Family
FAMILY SUMMARY: A family of about 13 genera and 800 species, herbs, especially diverse in South America, n. North America, and n. Eurasia. Although included in Amaryllidaceae by APG III (2009), Seberg et al. (2012) and others make a strong case for the benefits of recognizing smaller families in the Asparagales, a course followed here.
FAMILY REFERENCE: Dahlgren, Clifford, & Yeo (1985); M�ller-Doblies & M�ller-Doblies (1996); Meerow & Snijman in Kubitzki (1998a); Fay & Chase (1996); Rahn in Kubitzki (1998a).

NCBG DESCRIPTIVES

INTRO: Erect, scapose perennial found in open woodlands or around outcrops of shale or mafic, ultramafic, or calcareous rocks, mostly at low elevations in the Mountains.
STEMS: Stem a smooth flowering scape arising from a cluster of reddish-purple bulbs.
LEAVES: Leaves mostly basal, linear and flattened, 4-15 in. long, with a whitish cast and limp appearance.
INFLORESCENCE:
FLOWERS: Flowers on relatively thick stalks within a dense umbel at the “shepherd’s crook” terminus of the scape, white or pink to purplish, widely bell-shaped and downward pointing, to ¼ in. long and consisting of 6 petaloid tepals.
FRUITS: Fruit a 3-lobed capsules containing black seeds.
COMMENTS: All parts have an onion smell and flavor; bulbils are absent. The similar Allium alleghaniense, which is more restricted in distribution and favors moderate to fairly high elevations, differs in having darker magenta-purple tepals with rounded rather than pointed tips.
HEIGHT: 12-15 in.

DURATION: Perennial
HABIT: Herb

LEAF ARRANGEMENT: Basal
LEAF COMPLEXITY: Simple
LEAF RETENTION:

FLORAL CHARACTERISTICS
SYMMETRY: Radial (Actinomorphic)
BLOOM TIME: Jun-early Aug
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
x x x x

BLOOM COLOR: White or light pink
White Red Pink Orange Yellow Green Blue Lavender Purple Violet Brown Not Applicable
x x

FRUITING PERIOD: Aug-Oct.

DISTRIBUTION
HABITAT TYPE: Outcrops and glades, Woods margins
NATIVE RANGE: North America

HORTICULTURAL
Plant Sale Text: Nodding onion is found in open woodlands and rock outcrops at lower mountain elevations in much of the continental U.S. The nodding umbels of pink flowers serve to distinguish nodding onion from other members of the genus Allium. Nodding onion is useful for small border massings, rock gardens and naturalized areas. Cut back foliage and seed heads in the fall.

Bloom Table Text:

NCBG Location:

Cultural Notes:

SOIL MOISTURE: Dry, Average, Well-drained
LIGHT EXPOSURE: Sun, Part Shade, Shade
MINIMUM HARDINESS ZONE: 3
MAXIMUM HARDINESS ZONE: 9
GERMINATION CODE: 1
WILDLIFE VALUE: Bee Friendly, Butterfly Friendly
DEER RESISTANCE:

GRIM ACCESSIONS

acc_id acc_num acc_dt coll_id Action
43 2015-0021 2015-10-28 16 View
1219 1986-0989 View
4315 1992-0471 View
6621 1996-0256 View
8165 2004-0175 2006-05-19 View
9224 2005-0255 2020-05-07 1572 View
9401 2021-0059 2021-05-19 16 View


GRIM COLLECTIONS

Coll_id Project Collection date Collector Action
16 HORT 2014-08-28 Summer View
1266 HORT 2005-08-22 Bryan View
1325 HORT 2006-09-01 Bryan View
1572 HORT 2005-09-30 Bryan View
1704 HORT 2005-01-01 Bryan View
1800 HORT 2005-01-01 Bryan View
1873 HORT Summer View
2172 NPMD 2019-08-19 Touloupas View


GRIM PLANTINGS

plt_num acc_id loc_num pers_num inst_dt Action
57 43 16 Liloia 2015-07-01 View
2110 1219 81 NCBG staff 0000-00-00 View
6643 4315 200 NCBG staff 1993-03-01 View
9351 6621 124 NCBG staff 1967-12-31 View
11419 8165 81 NCBG staff 2004-01-01 View
12322 9224 71 Liloia 2009-03-09 View
12691 9401 16 Liloia 0000-00-00 View

USDA PLANTS DATABASE

USDA Symbol: ALCE2
USDA Common Name: Nodding Onion
Native Status: L48 (N), CAN (N)
Distribution: USA (AL, AR, AZ, CO, DC, GA, IA, ID, IL, IN, KY, MD, MI, MN, MO, MS, MT, NC, NE, NJ, NM, NY, OH, OR, PA, SC, SD, TN, TX, UT, VA, WA, WI, WV, WY), CAN (AB, BC, ON, SK)
Duration: Perennial
Growth Habit: Forb/herb

NATIONAL WETLAND INDICATOR STATUS

Region:AGCPAKAWCBEMPGPHIMWNCNEWMVE
Status: FACU FACU FACU UPL FACU FACU FACU

This information is derived from the U.S. Army Corps of Engineers 2016 National Wetland Plant List, Version 3.3 (Lichvar, R.W., D.L. Banks, W.N. Kirchner, and N.C. Melvin. 2016. The National Wetland Plant List: 2016 wetland ratings. Phytoneuron 2016-30: 1-17. Published 28 April 2016. ISSN 2153 733X). Regions: AGCP-Atlantic and Gulf Coastal Plain, AK-Alaska, AW-Arid West, CB-Caribbean, EMP-Eastern Mountains and Piedmont, GP-Great Plains, HI-Hawaii, MW-Midwest, NCNE-Northcentral and Northeast, WMCV-Western Mountains, Valleys & Coast

WEAKLEY FLORA

SCIENTIFIC NAME: Allium cernuum
COMMON NAME: Nodding Onion
SYNONYMY: [= S, Va; < A. cernuum - C, F, FNA, G, Pa, RAB, W (also see A. allegheniense and/or A. oxyphilum); > A. cernuum var. cernuum - K]
PHENOLOGY: Jun-early Aug; Aug-Oct.
HABITAT: Generally in open woodlands or around outcrops of shale, mafic, ultramafic, or calcareous rocks, in the mountains at low elevations.
COMMENTS: NY, MI, MN, and BC, south to GA and AZ; the distribution is oddly fragmented into largely Rocky Mountain, Ozarkian, and Appalachian segments, and it is quite possible that cryptic taxa are involved. See discussion of A. oxyphilum at end of genus.
RANGE MAP: Allium cernuum.png

Key to Map Symbols
ABOUT FAMILY (Weakley Flora)
Alliaceae Borkhausen 1797 (Onion Family)
SUMMARY: A family of about 13 genera and 800 species, herbs, especially diverse in South America, n. North America, and n. Eurasia. Although included in Amaryllidaceae by APG III (2009), Seberg et al. (2012) and others make a strong case for the benefits of recognizing smaller families in the Asparagales, a course followed here.
REFERENCE: Dahlgren, Clifford, & Yeo (1985); M�ller-Doblies & M�ller-Doblies (1996); Meerow & Snijman in Kubitzki (1998a); Fay & Chase (1996); Rahn in Kubitzki (1998a).
ABOUT GENUS (Weakley Flora)
Allium L. (Onion)
SUMMARY: A genus of 500-700 species, herbs, of Eurasia, n. Africa, and North America (especially diverse in c. Asia).
REFERENCE: Mathew (1996)=Z; Rahn in Kubitzki (1998a); McNeal & Jacobsen in FNA (2002a). [also see Nothoscordum]

HERBARIUM RESOURCES

SERNEC: Find Allium cernuum in Southeast Regional Network of Experts and Collections (if available)
UNC SERNEC: Find Allium cernuum in University of North Carolina Chapel Hill Herbarium - Southeast Regional Network of Experts and Collections (if available)

WEB RESOURCES

USDA: Find Allium cernuum in USDA Plants
NPIN: Find Allium cernuum in NPIN Database
FNA: Find Allium cernuum in the Flora of North America (if available)
Google: Search Google for Allium cernuum

NCBG IMAGE RECORDS

ID IMAGE1: 8024
ID IMAGE2: 0
ID IMAGE3: 12273

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