View source for Agoseris retrorsa

{{Treatment/ID
|accepted_name=Agoseris retrorsa
|accepted_authority=(Bentham) Greene
|publications={{Treatment/Publication
|title=Pittonia
|place=2: 178. 1891
|year=1891
}}
|common_names=Spearleaf agoseris
|basionyms={{Treatment/ID/Basionym
|name=Macrorhynchus retrorsus
|authority=Bentham
|rank=species
|publication_title=Pl. Hartw.,
|publication_place=320. 1849
}}
|synonyms={{Treatment/ID/Synonym
|name=Macrorhynchus angustifolius
|authority=Kellogg
|rank=species
}}
|hierarchy=Asteraceae;Asteraceae tribe Cichorieae;Agoseris;Agoseris retrorsa
|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>[[Agoseris]]</div><div class="higher-taxon"><small>species</small>[[Agoseris retrorsa]]</div></div>
|volume=Volume 19
|mention_page=page 325, 329, 331, 332
|treatment_page=page 330
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Stems </b>0. <b>Leaves</b> erect to ascending; petioles often purplish; blades linear to linear-elliptic, (7–)10–30(–36) cm, margins usually lobed to pinnatifid, rarely toothed or entire, lobes (4–)7–9(–11) pairs, linear to lanceolate, mostly retrorse, sometimes spreading, lobules often present, faces sparsely villous to tomentose. <b>Peduncles</b> elongating after flowering, 15–65(–94) cm in fruit, ± glabrate, or apically villous to tomentose, eglandular. <b>Involucres</b> cylindric to obconic or campanulate, 4–6 cm in fruit. <b>Phyllaries</b> in 3–5 series, medially rosy purple or all green, lacking darker spots or midstripes, margins ciliate to tomentose, faces glabrous or villous, eglandular; outer erect to spreading, adaxially glabrous or tomentose; inner erect, often precociously elongating and much surpassing outer. <b>Receptacles</b> epaleate. <b>Florets</b> 10–100; corollas yellow, tubes 8–20 mm, ligules 6–15 × 1.5–2.5 mm; anthers 2–5 mm. <b>Cypselae</b> (15–)20–31 mm, bodies narrowly obconic, 5–7 mm, beaks (10–)15–25 mm, lengths mostly 3–4 times bodies; ribs strongly ridged, straight, often minutely cinereous-pannose; pappus bristles in 4–6 series, (11–)15–20 mm. <b>2n</b> = 18.</span><!--

-->{{Treatment/Body
|phenology=Flowering Apr–Aug.
|habitat=Mesic to dry habitats in scrub-lands, chaparral, steppe, and open oak or pine woodlands
|elevation=400–2300 m
|distribution=Ariz.;Calif.;Nev.;Oreg.;Utah;Wash.;Mexico (Baja California).
|discussion=<p><i>Agoseris retrorsa</i> appears to be most closely related to <i>A. grandiflora</i>. It superficially resembles <i>A. parviflora</i> and the two are sometimes confused. <i>Agoseris retrorsa</i> occurs primarily west of the Sierra <i>Nevada</i>; <i>A. parviflora</i> occurs primarily east of the same range. Cypsela characteristics will quickly separate them. Putative hybrids between <i>A. retrorsa</i> and <i>A. grandiflora</i>, <i>A. hirsuta</i>, and <i>A. parviflora</i> have been identified.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Agoseris retrorsa
|authority=(Bentham) Greene
|rank=species
|parent rank=genus
|synonyms=Macrorhynchus angustifolius
|basionyms=Macrorhynchus retrorsus
|family=Asteraceae
|phenology=Flowering Apr–Aug.
|habitat=Mesic to dry habitats in scrub-lands, chaparral, steppe, and open oak or pine woodlands
|elevation=400–2300 m
|distribution=Ariz.;Calif.;Nev.;Oreg.;Utah;Wash.;Mexico (Baja California).
|reference=None
|publication title=Pittonia
|publication year=1891
|special status=
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V19-20-21/V19_505.xml
|tribe=Asteraceae tribe Cichorieae
|genus=Agoseris
|species=Agoseris retrorsa
}}<!--

-->[[Category:Treatment]][[Category:Agoseris]]