View source for Silphium radula

{{Treatment/ID
|accepted_name=Silphium radula
|accepted_authority=Nuttall
|publications={{Treatment/Publication
|title=Trans. Amer. Philos. Soc., n. s.
|place=7: 341. 1840
|year=1840
}}
|common_names=Roughleaf rosinweed
|basionyms=
|synonyms=
|hierarchy=Asteraceae;Asteraceae tribe Heliantheae;Asteraceae (tribe Heliantheae) subtribe Ecliptinae;Silphium;Silphium radula
|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 radula]]</div></div>
|volume=Volume 21
|mention_page=page 78, 82
|treatment_page=page 80
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>caulescent, 30–250 cm; fibrous rooted. <b>Stems</b> terete, scabrous, hispid, or hirsute. <b>Leaves</b>: basal persistent or caducous, petiolate; cauline alternate or opposite, petiolate or sessile; blades lanceolate to ovate, 2–22 × 0.5–8 cm, bases attenuate to round, margins coarsely dentate or entire, apices acuminate to acute, faces scabrous, hispid, or hirsute. <b>Phyllaries</b> 18–37 in 2–4 series, outer appressed or reflexed, apices acute, abaxial faces scabrous. <b>Ray</b> florets 12–30+; corollas yellow. <b>Disc</b> florets 100–175; corollas yellow. <b>Cypselae</b> 10–17 × 7–15 mm; pappi 2–5 mm.</span><!--

-->{{Treatment/Body
|distribution=sc United States.
|discussion=<p>Varieties 2 (2 in the flora).</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Basal leaves caducous; ray florets 20–30+
|[[Silphium radula var. radula|Silphium radula var. radula]]
|-id=key-0-1
|1
|Basal leaves persistent; ray florets 12–18
|[[Silphium radula var. gracile|Silphium radula var. gracile]]
|}
</div></div><!--

-->{{#Taxon:
name=Silphium radula
|authority=Nuttall
|rank=species
|parent rank=genus
|synonyms=
|basionyms=
|family=Asteraceae
|distribution=sc United States.
|reference=None
|publication title=Trans. Amer. Philos. Soc., n. s.
|publication year=1840
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V19-20-21/V21_182.xml
|tribe=Asteraceae tribe Heliantheae
|subtribe=Asteraceae (tribe Heliantheae) subtribe Ecliptinae
|genus=Silphium
|species=Silphium radula
}}<!--

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