View source for Prenanthes alba

{{Treatment/ID
|accepted_name=Prenanthes alba
|accepted_authority=Linnaeus
|publications={{Treatment/Publication
|title=Sp. Pl.
|place=2: 798. 1753
|year=1753
}}
|common_names=White rattlesnakeroot;prenanthe blanche
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Nabalus albus
|authority=(Linnaeus) Hooker
}}
|hierarchy=Asteraceae;Asteraceae tribe Cichorieae;Prenanthes;Prenanthes alba
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Asteraceae]]</div><div class="higher-taxon"><small>tribe</small>[[Asteraceae tribe Cichorieae]]</div><div class="higher-taxon"><small>genus</small>[[Prenanthes]]</div><div class="higher-taxon"><small>species</small>[[Prenanthes alba]]</div></div>
|volume=Volume 19
|mention_page=page 265
|treatment_page=page 266
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>20–175 cm; taproots short and thickened, fibrous. <b>Stems</b> erect, often mottled purple or nearly all purple (often with stout bases, 8–12 mm diam.), proximally glabrous, tomentulose distally. <b>Leaves</b>: proximal present at flowering; petioles narrowly winged (to 18 cm); blades usually ovate to triangular or cordate, 4–30 × 3–18 cm, thin to coriaceous, bases often hastate, margins usually coarsely dentate or serrate, sometimes deeply 3-lobed or parted, lobes acute, faces glabrous adaxially, pale to whitish and sometimes hirsute abaxially; distal reduced. <b>Heads</b> (3–8, in clusters) in paniculiform arrays (densest near apices). <b>Involucres</b> cylindric to campanulate, 13–15 × 3–5 mm. <b>Calyculi</b> of 5–7, triangular to lanceolate bractlets 1–3 mm, glabrous. <b>Phyllaries</b> (6–)8(–9), ± purplish or maroon, lanceolate, 10–13 mm, margins scarious, minutely ciliate, apices acute, faces glabrous. <b>Florets</b> 7–9(–13); corollas whitish to pale pink, lavender or red, 9–15 mm. <b>Cypselae</b> brown or tan, elliptical to linear, 3.5–6 mm; pappi usually reddish brown, sometimes rusty, rarely yellowish, 6–7 mm. <b>2n</b> = 32.</span><!--

-->{{Treatment/Body
|phenology=Flowering Aug–Oct.
|habitat=Sandy oak-scrub, open oak-hickory woods, deciduous forests, dunes, creek banks, road cuts
|elevation=100–200 m
|distribution=Man.;Ont.;Que.;Sask.;Ark.;Conn.;Del.;Ga.;Ill.;Ind.;Iowa;Ky.;Maine;Md.;Mass.;Mich.;Minn.;Mo.;N.H.;N.J.;N.Y.;N.C.;N.Dak.;Ohio;Pa.;R.I.;S.Dak.;Tenn.;Vt.;Va.;W.Va.;Wis.
|discussion=<p><i>Prenanthes alba</i> is recognized by the purplish stems, relatively large, coarse, ovate or triangular leaves, relatively long, winged petioles, glabrous and often purple phyllaries, and usually reddish brown pappi. The leaves are variable, occasionally deeply 3-lobed. W. L. Milstead (1964) recognized specimens with a pale yellow pappi as “<i></i></i>subsp.<i><i> pallida</i>,” distributed on the east coast in New Jersey, Virginia, and North Carolina. Because pappus color tends to fade somewhat on herbarium specimens, that character is difficult to assess on older specimens. The name was not validly published.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Prenanthes alba
|author=
|authority=Linnaeus
|rank=species
|parent rank=genus
|synonyms=Nabalus albus
|basionyms=
|family=Asteraceae
|phenology=Flowering Aug–Oct.
|habitat=Sandy oak-scrub, open oak-hickory woods, deciduous forests, dunes, creek banks, road cuts
|elevation=100–200 m
|distribution=Man.;Ont.;Que.;Sask.;Ark.;Conn.;Del.;Ga.;Ill.;Ind.;Iowa;Ky.;Maine;Md.;Mass.;Mich.;Minn.;Mo.;N.H.;N.J.;N.Y.;N.C.;N.Dak.;Ohio;Pa.;R.I.;S.Dak.;Tenn.;Vt.;Va.;W.Va.;Wis.
|reference=None
|publication title=Sp. Pl.
|publication year=1753
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V19-20-21/V19_360.xml
|tribe=Asteraceae tribe Cichorieae
|genus=Prenanthes
|species=Prenanthes alba
}}<!--

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