View source for Oönopsis

{{Treatment/ID
|accepted_name=Oönopsis
|accepted_authority=(Nuttall) Greene
|publications={{Treatment/Publication
|title=Pittonia
|place=3: 45. 1896
|year=1896
}}
|basionyms={{Treatment/ID/Basionym
|name=Oönopsis
|authority=Nuttall
|rank=unranked
|publication_title=Trans. Amer. Philos. Soc., n. s.
|publication_place=7: 335. 1840
}}
|synonyms={{Treatment/ID/Synonym
|name=Haplopappus sect. Oönoopsis
|authority=(Nuttall) H. M. Hall
|rank=section
}}
|hierarchy=Asteraceae;Asteraceae tribe Astereae;Oönopsis
|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>[[Oönopsis]]</div></div>
|etymology=Greek oön, egg, and - opsis, likeness, alluding to a perceived egglike appearance of heads
|volume=Volume 20
|mention_page=page 13, 15, 16, 395, 402, 411
|treatment_page=page 410
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Perennials,</b> 5–30 cm (taproots deep, woody, usually with 1–2 horizontal, spreading, sprouting branch roots, and root crowns bearing woody, branched caudices). <b>Stems</b> erect, simple or branched, glabrous or sparsely tomentose. <b>Leaves</b> mostly cauline (crowded); alternate; sessile; blades 1- or weakly 3-nerved, linear to narrowly oblanceolate or lanceolate (little reduced to immediately proximal to heads), margins entire, faces glabrous or sparsely villous. <b>Heads</b> radiate or discoid, borne singly or (2–12) in loose corymbiform or nearly glomerate arrays. <b>Involucres</b> hemispheric to campanulate or cylindro-turbinate, 7–25 × 5–20 mm. <b>Phyllaries</b> 20–35 in 3–6 series, 1-nerved (sometimes weakly keeled by thin, indurate midnerves), ovate-triangular to oblong-lanceolate, unequal to subequal, outer herbaceous, inner chartaceous, margins not scarious, flat to convex (apices long-acuminate to abruptly obtuse and cuspidate or apiculate), faces glabrous or puberulent. <b>Receptacles</b> shallowly convex, barely pitted, epaleate. <b>Ray</b> florets 0 or 6–25, pistillate, fertile; corollas yellow. <b>Disc</b> florets 15–50, bisexual, fertile; corollas yellow, tubes shorter than funnelform throats, lobes 5, erect, deltate to triangular; style-branch appendages triangular. <b>Cypselae</b> (brownish) prismatic or narrowly turbinate, slightly compressed to subcylindric, 5–7 mm, 5(–8)-ribbed, faces strigose to scabrous or glabrous; pappi persistent, of 15–30, brownish, flattened, unequal, ciliate-barbellate, apically attenuate bristles in 1–2 series. <b>x</b> = 5 (4).</span><!--

-->{{Treatment/Body
|distribution=w;c United States.
|discussion=<p>Species 4 (4 in the flora).</p><!--
--><p><i>Oönopsis</i> is characterized by a relatively low habit, woody taproots with ample vegetative reproduction via one or two horizontal, spreading, sprouting branch roots, root crowns bearing woody, branched caudices, even-sized cauline leaves continuing up the stems and subtending the heads, foliaceous outer phyllaries, and yellow rays (in two species). All taxa are selenium-accumulating and indicators of selenium substrates. An undescribed fifth species has been noted (G. K. Brown 1993) from Pueblo and Fremont counties, Colorado; it is closely related to <i>Oönopsis foliosa</i>.</p>
|tables=
|references={{Treatment/Reference
|id=bricker1998a
|text=Bricker, J. S. and G. K. Brown. 1998. A molecular phylogeny for Oönopsis (Asteraceae). [Abstract.] Amer. J. Bot. 85(6, suppl.): 170.
}}{{Treatment/Reference
|id=brown1989a
|text=Brown, G. K. and W. D. Clark. 1989. Flavonoids of Haplopappus section Oönopsis. [Abstract.] Amer. J. Bot. 76(6, suppl.): 190.
}}{{Treatment/Reference
|id=brown1993a
|text=Brown, G. K. 1993. Systematics of Oönopsis (Asteraceae). [Abstract.] Amer. J. Bot. 80(6, suppl.): 133–134.
}}{{Treatment/Reference
|id=evans1991a
|text=Evans, T. M. and G. K. Brown. 1991. Chloroplast DNA variation in Haplopappus section Oönopsis (Asteraceae). [Abstract.] Amer. J. Bot. 78(6, suppl.): 185.
}}
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Leaf blades linear to linear-oblanceolate, 0.7–5 mm wide; involucres 6-–11.5(–13) mm; phyllary apices abruptly acute to obtuse, apiculate to cuspidate; disc florets 7–28
|[[#key-0-2| > 2]]
|-id=key-0-1
|1
|Leaf blades oblanceolate to narrowly obovate or oblong-oblanceolate, 2–16 mm wide; involucres 10–25 mm; phyllary apices long-acuminate to long-acute, not apiculate or cuspidate; disc florets 10–45 or 53–150
|[[#key-0-3| > 3]]
|-id=key-0-2
|2
|Ray florets 5–11; cypselae 2.8–4 mm, tomentose
|[[Oönopsis multicaulis|Oönopsis multicaulis]]
|-id=key-0-2
|2
|Ray florets 0; cypselae 5–6 mm, glabrous or sparsely scabrous
|[[Oönopsis engelmannii|Oönopsis engelmannii]]
|-id=key-0-3
|3
|Stems glabrous; cauline leaves not auriculate or clasping; heads not immediately subtended by leaflike bracts, distalmost cauline abruptly reduced in size; ray florets 0; disc florets 10–45
|[[Oönopsis wardii|Oönopsis wardii]]
|-id=key-0-3
|3
|Stems villosulous or glabrous; at least distal cauline leaves subauriculate and subclasping; heads immediately subtended by leaflike bracts similar to distal cauline leaves; ray florets 15–25 or 0; disc florets 53–150
|[[Oönopsis foliosa|Oönopsis foliosa]]
|}
</div></div><!--

-->{{#Taxon:
name=Oönopsis
|author=Gregory K. Brown;Guy L. Nesom
|authority=(Nuttall) Greene
|rank=genus
|parent rank=tribe
|synonyms=Haplopappus sect. Oönoopsis
|basionyms=Oönopsis
|family=Asteraceae
|illustrator=Linny Heagy
|illustration copyright=Flora of North America Association
|distribution=w;c United States.
|reference=bricker1998a;brown1989a;brown1993a;evans1991a
|publication title=Pittonia
|publication year=1896
|special status=
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V19-20-21/V20_939.xml
|tribe=Asteraceae tribe Astereae
|genus=Oönopsis
}}<!--

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