View source for Sericocarpus

{{Treatment/ID
|accepted_name=Sericocarpus
|accepted_authority=Nees
|publications={{Treatment/Publication
|title=Gen. Sp. Aster.,
|place=10, 148. 1832
|year=1832
}}
|common_names=White-topped aster
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Aster subg. Sericocarpus
|authority=(Nees) A. G. Jones
}} {{Treatment/ID/Synonym
|name=Aster sect. Sericocarpus
|authority=(Nees) Semple
}} {{Treatment/ID/Synonym
|name=Aster sect. Serratifolii
|authority=Loudon
}}
|hierarchy=Asteraceae;Asteraceae tribe Astereae;Sericocarpus
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Asteraceae]]</div><div class="higher-taxon"><small>tribe</small>[[Asteraceae tribe Astereae]]</div><div class="higher-taxon"><small>genus</small>[[Sericocarpus]]</div></div>
|etymology=Greek sericos, silky, and carpos, fruit, alluding to densely pubescent cypselae
|volume=Volume 20
|mention_page=page 19, 102, 171
|treatment_page=page 101
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Perennials,</b> 15–120 cm (rhizomatous or with stout, branching, woody caudices). <b>Stems</b> erect, simple, glabrate to hairy. <b>Leaves</b> basal (in rosettes, usually withering by flowering) and cauline; alternate; petiolate (basal) to sessile (cauline); basal blades spatulate, margins distally serrate; cauline blades 1-nerved (reticulately nerved), linear, obovate or ovate, reduced distally, margins serrate or entire, ciliate (apices acuminate to acute, sometime slightly cuspidate), faces glabrate or hairy. <b>Heads</b> radiate, (2–5 per branch in clusters) in corymbiform to broadly corymbiform (sometimes compact) arrays. <b>Involucres</b> cylindric, (3–9 ×) 2.4–8.5 mm. <b>Phyllaries</b> 15–30 in 3–5 series, 1-nerved (± keeled), thumbnail-shaped, inner more linear, unequal, bases ± indurate, margins scarious, ciliate, apices with dark green zones, (faces glabrate to hairy). <b>Receptacles</b> slightly convex, pitted, epaleate. <b>Ray</b> florets 1–6, pistillate, fertile; corollas white. <b>Disc</b> florets 5–19, bisexual, fertile; corollas white to cream, tubes shorter (longer in <i>S. linifolius</i>) than weakly funnelform throats, lobes 5, erect to spreading, triangular; style-branch appendages linear-lanceolate. <b>Cypselae</b> fusiform to obconic, terete to slightly compressed, 7–10-ribbed, ± densely strigose; pappi persistent, of 25–50, white to tan or rust, barbellate bristles in (2–)3(–4) series (outermost, when present, 0.1–1 mm, outer distally attenuate, 3–7 mm, inner distally clavate, 3–8 mm). <b>x</b> = 9.</span><!--

-->{{Treatment/Body
|distribution=w;e North America.
|discussion=<p>Species 5 (5 in the flora).</p><!--
--><p>A. Gray et al. [1878–1897, vol. 1(2)], J. K. Small (1903), M. L. Fernald (1950), and L. Abrams and R. S. Ferris (1923–1960, vol. 4) considered <i>Sericocarpus</i> as a genus distinct from the traditionally defined genus <i>Aster</i>. In the last fifty years most botanists, including A. G. Jones (1980) and J. C. Semple and L. Brouillet (1980), followed A. Cronquist (1955, 1980; H. A. Gleason and Cronquist 1963, 1991), who included the species in <i>Aster</i> in the broad traditional sense. Semple et al. (1996) retained <i>Sericocarpus</i> within <i>Aster</i> subg. <i>Aster</i> on the basis of similarities in phyllary traits and the results of a restriction fragment length polymorphism analysis of chloroplast DNA (Xiang C. and Semple 1996). DNA sequence data conclusively show that <i>Sericocarpus</i> is more closely related to <i>Solidago</i> than to other North American species of asters, which themselves can no longer be placed in the genus <i>Aster</i> (R. Noyes and L. H. Rieseberg 1999; Semple et al. 2002).</p><!--
--><p>J. L. A. Hood and J. C. Semple (2003) included observations on the triple pappus of some species of <i>Sericocarpus</i> in their paper on pappus variation in <i>Solidago</i>. They also proposed a “nomenclature” for the pappus whorls in the Astereae. The triseriate pappus of <i>Sericocarpus</i> is similar to that of <i>Doellingeria</i> and more obviously triple than in species of <i>Solidago</i>. M. J. Blondin et al. (2005) included detailed descriptions of pappus traits for all taxa in their multivariate study of the genus.</p><!--
--><p>In the descriptions below, involucre lengths were taken at flowering. Subtending peduncle bracts are those immediately subtending heads.</p>
|tables=
|references={{Treatment/Reference
|id=blondin2005a
|text=Blondin, M. J., R. E. Cook, and J. C. Semple. 2005. A multivariate morphometric study of the aster genus Sericocarpus Nees (Asteraceae: Astereae). Sida 21: 1473–1507.
}}{{Treatment/Reference
|id=nesom1993c
|text=Nesom, G. L. 1993e. Taxonomy of Sericocarpus (Asteraceae: Astereae). Phytologia 75: 45–54.
}}
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Cauline leaves (at least proximal) serrate (distal sometimes entire)
|[[Sericocarpus asteroides|Sericocarpus asteroides]]
|-id=key-0-1
|1
|Cauline leaves entire
|[[#key-0-2| > 2]]
|-id=key-0-2
|2
|Stems and leaves moderately to densely hairy
|[[#key-0-3| > 3]]
|-id=key-0-2
|2
|Stems and leaves glabrate, sparsely hairy, or puberulent
|[[#key-0-4| > 4]]
|-id=key-0-3
|3
|Leaves obovate (proximal shorter than 30 mm), apices acuminate to slightly cuspidate; phyllaries in 4–5 series, strongly unequal
|[[Sericocarpus tortifolius|Sericocarpus tortifolius]]
|-id=key-0-3
|3
|Leaves elliptic (proximal 10–100 mm), apices acute; phyllaries in 3 series, unequal(outer 1.5 times inner)
|[[Sericocarpus oregonensis|Sericocarpus oregonensis]]
|-id=key-0-4
|4
|Leaves linear; involucres 4–6 mm (erect ray corollas longer than pappi); e United States
|[[Sericocarpus linifolius|Sericocarpus linifolius]]
|-id=key-0-4
|4
|Leaves lanceolate, obovate, or ovate; involucres (5–)6–9 mm (erect ray corollas shorter than pappi); British Columbia, California, Oregon, Washington
|[[#key-0-5| > 5]]
|-id=key-0-5
|5
|Rays 2–5, laminae 3–4 mm
|[[Sericocarpus oregonensis|Sericocarpus oregonensis]]
|-id=key-0-5
|5
|Rays 1, laminae 2–3 mm
|[[Sericocarpus rigidus|Sericocarpus rigidus]]
|}
</div></div><!--

-->{{#Taxon:
name=Sericocarpus
|author=John C. Semple;Michelle R. Leonard
|authority=Nees
|rank=genus
|parent rank=tribe
|synonyms=Aster subg. Sericocarpus;Aster sect. Sericocarpus;Aster sect. Serratifolii
|basionyms=
|family=Asteraceae
|illustrator=Marjorie C. Leggitt
|distribution=w;e North America.
|reference=blondin2005a;nesom1993c
|publication title=Gen. Sp. Aster.,
|publication year=1832
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V19-20-21/V20_198.xml
|tribe=Asteraceae tribe Astereae
|genus=Sericocarpus
}}<!--

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