View source for Pterocaulon

{{Treatment/ID
|accepted_name=Pterocaulon
|accepted_authority=Elliott
|publications={{Treatment/Publication
|title=Sketch Bot. S. Carolina
|place=2: 323. 1823
|year=1823
}}
|basionyms=
|synonyms=
|hierarchy=Asteraceae;Asteraceae tribe Plucheeae;Pterocaulon
|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>
|etymology=Greek pteron, wing, and kaulos, stem, alluding to stems winged by decurrent leaf bases
|volume=Volume 19
|mention_page=page 59, 475
|treatment_page=page 476
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Perennials,</b> 20–150 cm; usually rhizomatous and/or lignescent-tuberous-rooted. <b>Stems</b> erect, simple, internodes winged (by decurrent leaf bases), lanate-tomentose and/or glandular. <b>Leaves</b> cauline, alternate; sessile; blades linear to elliptic or obovate, bases decurrent, margins usually serrate to serrulate or denticulate, rarely entire, abaxial faces densely whitish-tomentose [puberulent or glabrescent], adaxial (green) glabrous or glabrescent, both faces usually stipitate- or sessile-glandular. <b>Heads</b> disciform, (sessile) in spiciform arrays (at ends of branches). <b>Involucres</b> cylindro-campanulate to campanulate, 2–3[–5] mm diam. <b>Phyllaries</b> persistent, in 4–6 series, distinct, narrowly lanceolate, unequal (subindurate to scarious). <b>Receptacles</b> flat, epaleate. <b>Ray</b> florets 0. <b>Peripheral</b> (pistillate) florets in 1–3+ series, fertile; corollas yellowish. <b>Inner</b> (functionally staminate [bisexual]) florets [1–]2–15[+]; corollas yellowish, lobes 5. <b>Cypselae</b> cylindric to fusiform, angled or slightly compressed, ribs 6–9 (white, narrow), faces usually sparsely strigose to hispidulous, minutely sessile-glandular between ribs; pappi persistent, of distinct, barbellulate bristles in 1–2 series. <b>x</b> = 10.</span><!--

-->{{Treatment/Body
|distribution=North America;South America;Australasia.
|discussion=<p>Species 17 (2 in the flora).</p><!--
--><p>The 11 primarily South American species of <i>Pterocaulon</i> sect. <i>Pterocaulon</i> have 1–17 functionally staminate florets per head, 1–2-seriate pappi, and hairs of tomentum with the relatively long, aseptate portion arising from clusters of basal cells. The 6 Australasian species of sect. Monenteles (Labillardière) Cabrera have a single functionally staminate floret per head, uniseriate pappi, and hairs of the tomentum equally septate throughout.</p>
|tables=
|references={{Treatment/Reference
|id=cabrera1978a
|text=Cabrera, A. L. and A. M. Ragonese. 1978. Revisión del género Pterocaulon (Compositae). Darwiniana 21: 185–257.
}}
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Heads in dense, usually continuous, rarely interrupted, narrow, ± ovoid arrays (2–)3–8(–10) cm (axes completely hidden by crowded heads); lengths of leaf blades mostly 2–7 times widths; functionally staminate florets 6–10(–15); flowering May–Jun; Alabama, Florida, Georgia, Mississippi, North Carolina, South Carolina
|[[Pterocaulon pycnostachyum|Pterocaulon pycnostachyum]]
|-id=key-0-1
|1
|Heads in open, ± interrupted, ± cylindric arrays (5–)8–20 cm (main axes visible between glomerules of heads); lengths of leaf blades mostly 6–8 times widths; functionally staminate florets 2–4(–5); flowering Aug–Oct; Louisiana, Texas
|[[Pterocaulon virgatum|Pterocaulon virgatum]]
|}
</div></div><!--

-->{{#Taxon:
name=Pterocaulon
|author=Guy L. Nesom
|authority=Elliott
|rank=genus
|parent rank=tribe
|synonyms=
|basionyms=
|family=Asteraceae
|distribution=North America;South America;Australasia.
|reference=cabrera1978a
|publication title=Sketch Bot. S. Carolina
|publication year=1823
|special status=
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V19_798.xml
|tribe=Asteraceae tribe Plucheeae
|genus=Pterocaulon
}}<!--

-->[[Category:Treatment]][[Category:Asteraceae tribe Plucheeae]]