View source for Pterocaulon pycnostachyum

{{Treatment/ID
|accepted_name=Pterocaulon pycnostachyum
|accepted_authority=(Michaux) Elliott
|publications={{Treatment/Publication
|title=Sketch Bot. S. Carolina
|place=2: 324. 1823
|year=1823
}}
|common_names=Fox-tail or coastal blackroot
|basionyms={{Treatment/ID/Synonym
|name=Conyza pycnostachya
|authority=Michaux
}}
|synonyms={{Treatment/ID/Synonym
|name=Pterocaulon undulatum
|authority=C. Mohr
}}
|hierarchy=Asteraceae;Asteraceae tribe Plucheeae;Pterocaulon;Pterocaulon pycnostachyum
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Asteraceae]]</div><div class="higher-taxon"><small>tribe</small>[[Asteraceae tribe Plucheeae]]</div><div class="higher-taxon"><small>genus</small>[[Pterocaulon]]</div><div class="higher-taxon"><small>species</small>[[Pterocaulon pycnostachyum]]</div></div>
|volume=Volume 19
|mention_page=
|treatment_page=page 476
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>2–8 dm. <b>Leaf</b> blades lanceolate to obovate-lanceolate, oblong, or elliptic, 3–11 × 1–3(–3.5) cm, lengths mostly 2–7 times widths, margins usually dentate or denticulate, slightly repand, sometimes nearly entire. <b>Heads</b> in dense, usually continuous, rarely interrupted (then near bases), narrow, ± ovoid arrays (2–)3–8(–10) cm (usually single, sometimes with 1–2 basal branches). <b>Involucres</b> campanulate, 4–5 mm. <b>Pistillate</b> florets 23–44. <b>Functionally</b> staminate florets 6–10(–15). <b>Cypselae</b> 1–1.3 mm. <b>2n</b> = 20.</span><!--

-->{{Treatment/Body
|phenology=Flowering May–Jun.
|habitat=Sandy pinelands, sandy fields, depressions, ditches
|elevation=0–20 m
|distribution=Ala.;Fla.;Ga.;Miss.;N.C.;S.C.
|discussion=<p>Differences between <i>Pterocaulon pycnostachyum</i> and <i>P. alopecuroides</i> (Lamarck) de Candolle, which is widespread in the West Indies and South America, are these: plants 50–70 cm high in <i>P. pycnostachyum</i> (versus 70–150 cm in <i>P. alopecuroides</i>), arrays of heads 4–8 cm (versus 3–17 cm) long, involucres 3.5–4 mm (versus 4.5–5 mm) high, and 6–15 (versus 1–3) functionally staminate florets (A. L. Cabrera and A. M. Ragonese 1978). In <i>P. alopecuroides</i>, the arrays of heads are almost always interrupted proximally, commonly producing sessile to subsessile branches. A count of functionally staminate florets provides a clear determinant for plants that might appear ambiguous in other features.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Pterocaulon pycnostachyum
|author=
|authority=(Michaux) Elliott
|rank=species
|parent rank=genus
|synonyms=Pterocaulon undulatum
|basionyms=Conyza pycnostachya
|family=Asteraceae
|phenology=Flowering May–Jun.
|habitat=Sandy pinelands, sandy fields, depressions, ditches
|elevation=0–20 m
|distribution=Ala.;Fla.;Ga.;Miss.;N.C.;S.C.
|reference=None
|publication title=Sketch Bot. S. Carolina
|publication year=1823
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V19-20-21/V19_799.xml
|tribe=Asteraceae tribe Plucheeae
|genus=Pterocaulon
|species=Pterocaulon pycnostachyum
}}<!--

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