| Nodding onion | 
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| Umbel | 
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| Scientific classification  | 
| Kingdom: | 
Plantae | 
 
| Clade: | 
Tracheophytes | 
 
| Clade: | 
Angiosperms | 
 
| Clade: | 
Monocots | 
 
| Order: | 
Asparagales | 
 
| Family: | 
Amaryllidaceae | 
 
| Subfamily: | 
Allioideae | 
 
| Genus: | 
Allium | 
| Species: | 
A. cernuum  | 
| Binomial name | 
Allium cernuum
  | 
| Synonyms | 
- Allium alatum Schreb. ex Roth
 
- Allium allegheniense Small
 
- Allium cernuum f. alba J.K.Henry
 
- Allium cernuum subsp. neomexicanum (Rydb.) Traub & Ownbey
 
- Allium cernuum var. neomexicanum (Rydb.) J.F.Macbr.
 
- Allium cernuum f. obtusum Cockerell
 
- Allium cernuum var. obtusum (Cockerell) Cockerell
 
- Allium cernuum subsp. obtusum (Cockerell) Traub & Ownbey
 
- Allium cernuum var. obtusum Cockerell ex J.F. Macbr.
 
- Allium neomexicanum Rydb.
 
- Allium nutans Schult. & Schult.f.
 
- Allium oxyphilum Wherry
 
- Allium recurvatum Rydb.
 
- Allium tricorne Poir.
 
- Calliprena cernua (Roth) Salisb.
 
- Cepa cernua (Roth) Moench
 
- Gynodon cernuum (Roth) Raf.
 
- Gynodon elliotii Raf.
 
- Gynodon rupestre Raf.
 
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Allium cernuum, known as nodding onion or lady's leek, is a perennial plant in the genus Allium. It grows in open areas in North America.