View source for Allium cernuum

{{Treatment/ID
|accepted_name=Allium cernuum
|accepted_authority=Roth
|publications={{Treatment/Publication
|title=Arch. Bot. (Leipzig)
|place=1: 40. 1798
|year=1798
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Allium allegheniense
|authority=Small
|rank=species
}} {{Treatment/ID/Synonym
|name=Allium oxyphilum
|authority=Wherry
|rank=species
}} {{Treatment/ID/Synonym
|name=Allium recurvatum
|authority=Rydberg
|rank=species
}}
|hierarchy=Liliaceae;Allium;Allium cernuum
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Liliaceae]]</div><div class="higher-taxon"><small>genus</small>[[Allium]]</div><div class="higher-taxon"><small>species</small>[[Allium cernuum]]</div></div>
|volume=Volume 26
|mention_page=page 228, 246
|treatment_page=page 247
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Bulbs </b>2–5+, clustered, often short-rhizomatous at base, rhizome not stout or iris-like, oblong, elongate, 1–3 × 0.8–1.5 cm; outer coats enclosing 1 or more bulbs, grayish or brownish, membranous, minutely striate, cells in regular vertical rows, narrowly elongate, fibers persistent, parallel, few; inner coats white to pink or reddish, cells in regular vertical rows, narrowly elongate. <b>Leaves</b> persistent, green at anthesis, 3–5, basally sheathing, sheaths not extending much above soil level; blade solid, flat, channeled to broadly V-shaped in cross section, 10–25 cm × 1–6 mm, margins entire or denticulate. <b>Scape</b> persistent, sometimes 2 or more produced successively from single bulb, usually clustered, nodding, solid, terete or ridged, particularly distally, sometimes flattened and narrowly winged, abruptly recurved near apex, 10–50 cm × 1–3 mm. <b>Umbel</b> persistent, cernuous, loose, 8–35-flowered, hemispheric, bulbils unknown; spathe bracts persistent, 2, 3-veined, lanceolate, ± equal, apex acuminate, beakless. <b>Flowers</b> campanulate, 4–6 mm; tepals ± erect, pink or white, elliptic-ovate, ± equal, withering in fruit, margins ± entire, apex ± obtuse, at least outer tepals strongly incurved, midribs not thickened; stamens exserted; anthers yellow; pollen yellow; ovary conspicuously crested; processes 6, flattened, ± triangular, margins entire or toothed; style exserted, linear, ± equaling stamens; stigma capitate, scarcely thickened, unlobed; pedicel 6–25 mm, becoming stouter in fruit, elongating and bending abruptly upward from near point of attachment. <b>Seed</b> coat dull or shining; cells smooth, minutely roughened, or each with minute, central papilla. <b>2n</b> = 14.</span><!--

-->{{Treatment/Body
|phenology=Flowering Jul–Oct.
|habitat=Widely distributed on moist soils in mountainous and cool regions
|elevation=600–3500 m
|distribution=Alta.;B.C.;Ont.;Sask.;Ala.;Ariz.;Ark.;Colo.;D.C.;Ga.;Idaho;Ill.;Ind.;Iowa;Ky.;Md.;Mich.;Minn.;Mo.;Mont.;Nebr.;N.Mex.;N.Y.;N.C.;Ohio;Oreg.;Pa.;S.C.;S.Dak.;Tenn.;Tex.;Utah;Va.;Wash.;W.Va.;Wis.;Wyo.;Mexico.
|discussion=<p><i>Allium cernuum</i> is the most widespread North American species of the genus. It is closely related to <i>A. stellatum</i>, and the character commonly used to differentiate them has been umbel orientation. In both species, the inflorescence is nodding in bud, but in <i>A. stellatum</i> it usually becomes erect by anthesis. In <i>A. cernuum</i> the peduncle remains permanently recurved near the apex, although the inflorescence may sometimes become erect overall, or nearly so. While this character is helpful in identification, an almost exclusive reliance on it (even by one of the present authors in his youth) has obscured other clearer distinctions between the species and has confused their geographic ranges. More reliable characters for differentiating these species are bulb shape (elongate in <i>A. cernuum</i>, ovoid in <i>A. stellatum</i>) and perianth shape (campanulate in <i>A. cernuum</i>, stellate in <i>A. stellatum</i>). Unfortunately, perianth shape is often difficult to see in herbarium specimens.</p>
|tables=
|references=
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-->{{#Taxon:
name=Allium cernuum
|authority=Roth
|rank=species
|parent rank=genus
|synonyms=Allium allegheniense;Allium oxyphilum;Allium recurvatum
|basionyms=
|family=Liliaceae
|phenology=Flowering Jul–Oct.
|habitat=Widely distributed on moist soils in mountainous and cool regions
|elevation=600–3500 m
|distribution=Alta.;B.C.;Ont.;Sask.;Ala.;Ariz.;Ark.;Colo.;D.C.;Ga.;Idaho;Ill.;Ind.;Iowa;Ky.;Md.;Mich.;Minn.;Mo.;Mont.;Nebr.;N.Mex.;N.Y.;N.C.;Ohio;Oreg.;Pa.;S.C.;S.Dak.;Tenn.;Tex.;Utah;Va.;Wash.;W.Va.;Wis.;Wyo.;Mexico.
|reference=None
|publication title=Arch. Bot. (Leipzig)
|publication year=1798
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V26/V26_437.xml
|genus=Allium
|species=Allium cernuum
}}<!--

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