Munur á milli breytinga „Hvolflaukur“

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Hver fullþroska laukur er með stakan blómstrandi blómstöngul, sem endar í lútandi blómskipun með hvítum eða bleikum blómum. Blómin koma í júlí eða ágúst (júní-júlí á Íslandi). Þau eru bjöllulaga, um 5 mm í þvermál, bleik eða hvít með gulum frjókornum og gulum fræflum. Þessi tegund myndar ekki æxlilauka í blómskipuninni.
 
Blómin þroskast í kúlulaga, "crested" fræhylki sem síðar opnast og sýna gljáandi dökk fræin.<ref name="flora" /><ref>{{cite web | title = Nodding Onion (Allium cernuum) | url = http://www.illinoiswildflowers.info/prairie/plantx/nod_onionx.htm | website = Illinois Wildflowers | date = 2016 | last1 = Hilty | first1 = John }}</ref><ref>{{cite journal |last=Roth |first=Albrecht Wilhelm |date=1798|title=Novae Plantarum Species|url=https://biodiversitylibrary.org/page/42089215|journal=Archiv für die Botanik |volume=1 |issue=3 |page=40|pages=|via=}}</ref><ref>{{cite book |last1=Gleason |first1=H. A. |first2=A.J. |last2=Cronquist |date=1991 |title=Manual of the Vascular Plants of Northeastern United States and Adjacent Canada |edition=2 |pages=i–910 |publisher=New York Botanical Garden |location=Bronx}}</ref><ref>{{cite book|last1=Cronquist |first1=A.J. |first2=A. H. |last2=Holmgren |first3=N. H. |last3=Holmgren |first4=J. L. |last4=Reveal |date=1977 |title=Vascular Plants of the Intermountain West, U.S.A. |volume=6 |pages=1–584 |editor1-first=A.J. |editor1-last=Cronquist |editor2-first=A. H. |editor2-last=Holmgren |editor3-first=N. H. |editor3-last=Holmgren |editor4-first=J. L. |editor4-last=Reveal |editor5-first=P. K. |editor5-last=Holmgren |encyclopedia=Intermountain Flora |publisher=Hafner Pub. Co. |location=New York}}</ref><ref>{{cite book |last1=Hitchcock |first1=C. H. |first2=A.J. |last2=Cronquist |first3=F. M. |last3=Ownbey |first4=J. W. |last4=Thompson |date=1969 |contribution=Vascular Cryptogams, Gymnosperms, and Monocotyledons |volume=1 |pages=1–914 |editor-first=C. L. |editor-last=Hitchcock |title=Vascular Plants of the Pacific Northwest |publisher=University of Washington Press |location=Seattle}}</ref><ref>{{cite book|last1=Radford |first1=A. E. |first2=H. E. |last2=Ahles |first3=C. R. |last3=Bell |date=1968 |title=Manual of the Vascular Flora of the Carolinas |pages=i–lxi, 1–1183 |publisher=University of North Carolina Press |location=Chapel Hill}}</ref><ref>{{cite book|last=Moss |first=E. H. |date=1983 |title=Flora of Alberta |edition=2 |pages=i–xii, 1–687 |publisher=University of Toronto Press |location=Toronto}}</ref>
 
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