View source for Silphium perfoliatum

{{Treatment/ID
|accepted_name=Silphium perfoliatum
|accepted_authority=Linnaeus
|publications={{Treatment/Publication
|title=Syst. Nat. ed.
|place=10, 2: 1232. 1759
|year=1759
}}
|common_names=Cup plant
|basionyms=
|synonyms=
|hierarchy=Asteraceae;Asteraceae tribe Heliantheae;Asteraceae (tribe Heliantheae) subtribe Ecliptinae;Silphium;Silphium perfoliatum
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Asteraceae]]</div><div class="higher-taxon"><small>tribe</small>[[Asteraceae tribe Heliantheae]]</div><div class="higher-taxon"><small>subtribe</small>[[Asteraceae (tribe Heliantheae) subtribe Ecliptinae]]</div><div class="higher-taxon"><small>genus</small>[[Silphium]]</div><div class="higher-taxon"><small>species</small>[[Silphium perfoliatum]]</div></div>
|volume=Volume 21
|mention_page=page 77
|treatment_page=page 79
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>caulescent, 75–300 cm; fibrous rooted. <b>Stems</b> square, glabrous, hispid, or scabrous. <b>Leaves</b>: basal caducous; cauline usually opposite, rarely whorled (in 3s), petiolate or sessile; blades deltate, lanceolate, or ovate, 2–41 × 0.5–24 cm, bases attenuate or truncate (distal connate-perfoliate), margins entire, dentate, or bidentate, apices acuminate to acute, faces scabrous to hispid. <b>Phyllaries</b> 25–37 in 2–3 series, outer appressed, apices acute to acuminate, abaxial faces scabrous or hispid. <b>Ray</b> florets 17–35; corollas yellow. <b>Disc</b> florets 85–150 (–200); corollas yellow. <b>Cypselae</b> 8–12 × 5–9 mm; pappi 0.5–1.5 mm.</span><!--

-->{{Treatment/Body
|distribution=e North America.
|discussion=<p>Varieties 2 (2 in flora).</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Stems glabrous or sparsely scabrous; peduncles glabrous
|[[Silphium perfoliatum var. connatum|Silphium perfoliatum var. connatum]]
|-id=key-0-1
|1
|Stems glabrous, hispid, or scabrous; peduncles usually scabrous to hispid
|[[Silphium perfoliatum var. perfoliatum|Silphium perfoliatum var. perfoliatum]]
|}
</div></div><!--

-->{{#Taxon:
name=Silphium perfoliatum
|author=
|authority=Linnaeus
|rank=species
|parent rank=genus
|synonyms=
|basionyms=
|family=Asteraceae
|distribution=e North America.
|reference=None
|publication title=Syst. Nat. ed.
|publication year=1759
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V19-20-21/V21_175.xml
|tribe=Asteraceae tribe Heliantheae
|subtribe=Asteraceae (tribe Heliantheae) subtribe Ecliptinae
|genus=Silphium
|species=Silphium perfoliatum
}}<!--

-->[[Category:Treatment]][[Category:Silphium]]