View source for Stebbinsoseris

{{Treatment/ID
|accepted_name=Stebbinsoseris
|accepted_authority=K. L. Chambers
|publications={{Treatment/Publication
|title=Amer. J. Bot.
|place=78: 1024. 1991
|year=1991
}}
|common_names=Silverpuffs
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Microseris sect. Brachycarpa
|authority=(Nuttall) K. L. Chambers
}} {{Treatment/ID/Synonym
|name=Uropappus sect. Brachycarpa
|authority=Nuttall
}}
|hierarchy=Asteraceae;Asteraceae tribe Cichorieae;Stebbinsoseris
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Asteraceae]]</div><div class="higher-taxon"><small>tribe</small>[[Asteraceae tribe Cichorieae]]</div><div class="higher-taxon"><small>genus</small>[[Stebbinsoseris]]</div></div>
|etymology=For G. Ledyard Stebbins, 1906–2000, California botanist
|volume=Volume 19
|mention_page=page 217, 218, 322, 338, 347
|treatment_page=page 346
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Annuals,</b> 1–10 cm; taprooted. <b>Stems</b> 0, or erect, mostly unbranched, glabrous or lightly scurfy-puberulent. <b>Leaves</b> usually all basal; petiolate (petioles narrowly attenuate, usually scurfy-puberulent, especially proximally); blades linear to narrowly oblanceolate, bases slightly clasping, margins entire or irregularly dentate or lobed (teeth and lobes narrow, acute, straight or arcuate, faces glabrous or minutely scurfy-puberulent). <b>Heads</b> borne singly (often inclined in bud, erect in flowering and fruit). <b>Peduncles</b> not notably inflated, usually ebracteate (glabrous or ± scurfy-puberulent, especially distally). <b>Calyculi</b> of (3–)4–14, deltate or ovate to lanceolate bractlets. <b>Involucres</b> campanulate, (3–)5–35 mm diam. (fusiform to ovoid in fruit). <b>Phyllaries</b> (4–)5–18 in ± 2 series, (green or purple) mostly lanceolate, subequal to equal, herbaceous, apices acute, faces glabrous. <b>Receptacles</b> flat, ± pitted, glabrous, epaleate. <b>Florets</b> (10–)30–125; corollas yellow or white, outer often purplish abaxially (equaling or surpassing phyllaries by 1–3 mm). <b>Cypselae</b> brown, purplish gray, stramineous, or violet, sometimes purple-spotted, columnar or truncate-fusiform, not beaked, ribs 10, ± scabrellous or spiculate, faces glabrous or (on outer) strigose; pappi persistent, of 5, usually yellowish or brownish, rarely white, aristate scales (bodies straight or arcuate, lanceolate, usually glabrous, margins plane or involute, apices erose or notched, aristae shorter than to equaling bodies, barbellulate). <b>x</b> = 18.</span><!--

-->{{Treatment/Body
|distribution=sw United States;nw Mexico.
|discussion=<p>Species 2 (2 in the flora).</p><!--
--><p><i>Stebbinsoseris</i> comprises two allotetraploid species derived from hybrids between <i>Microseris</i> and <i>Uropappus</i>. The justification for raising these species to generic rank was given in R. K. Jansen et al. (1991b), where molecular data were presented supporting the separation of <i>Uropappus</i> from <i>Microseris</i>. <i>Stebbinsoseris</i> and <i>Uropappus</i> were ranked as sections of <i>Microseris</i> in earlier taxonomic treatments (K. L. Chambers 1955, 1960). Because of its hybrid origin, <i>Stebbinsoseris</i> is intermediate in critical taxonomic traits of habit, involucre, and fruits (C. Irmler et al. 1982), and it is separated from its parental taxa by rather minor differences. Chloroplast DNA studies show that <i>Microseris douglasii</i> and <i>M. bigelovii</i> were the maternal parents of the tetraploid hybrids (R. S. Wallace and R. K. Jansen 1990). That <i>Uropappus lindleyi</i> was the staminate parent of those crosses is confirmed by nuclear rDNA evidence reported by Wallace and Jansen (1995).</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Cypselae narrowly truncate-fusiform, brown to purplish, 5–8 mm, apices not widened at bases of pappi; pappus scale bodies 3–5 mm; coastal central California
|[[Stebbinsoseris decipiens|Stebbinsoseris decipiens]]
|-id=key-0-1
|1
|Cypselae narrowly truncate-fusiform to columnar, gray to pale brown or violet (dark purplish in sw California), 4.5–12 mm, apices slightly widened at bases of pappi; pappus scale bodies 4–11 mm; widespread, rarely coastal except in sw California
|[[Stebbinsoseris heterocarpa|Stebbinsoseris heterocarpa]]
|}
</div></div><!--

-->{{#Taxon:
name=Stebbinsoseris
|author=Kenton L. Chambers
|authority=K. L. Chambers
|rank=genus
|parent rank=tribe
|synonyms=Microseris sect. Brachycarpa;Uropappus sect. Brachycarpa
|basionyms=
|family=Asteraceae
|illustrator=Yevonn Wilson-Ramsey
|distribution=sw United States;nw Mexico.
|reference=None
|publication title=Amer. J. Bot.
|publication year=1991
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V19-20-21/V19_540.xml
|tribe=Asteraceae tribe Cichorieae
|genus=Stebbinsoseris
}}<!--

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