View source for Erigeron divergens

{{Treatment/ID
|accepted_name=Erigeron divergens
|accepted_authority=Torrey & A. Gray
|publications={{Treatment/Publication
|title=Fl. N. Amer.
|place=2: 175. 1841
|year=1841
}}
|common_names=Spreading fleabane
|basionyms={{Treatment/ID/Basionym
|name=Erigeron divaricatus
|authority=Nuttall
|rank=species
|publication_title=Trans. Amer. Philos. Soc., n.s.
|publication_place=7: 311. 1840,
}}
|synonyms={{Treatment/ID/Synonym
|name=Erigeron accedens
|authority=Greene
|rank=species
}} {{Treatment/ID/Synonym
|name=Erigeron incomptus
|authority=A. Gray
|rank=species
}} {{Treatment/ID/Synonym
|name=Erigeron solisaltator
|authority=G. L. Nesom
|rank=species
}}
|hierarchy=Asteraceae;Asteraceae tribe Astereae;Erigeron;Erigeron divergens
|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>[[Erigeron]]</div><div class="higher-taxon"><small>species</small>[[Erigeron divergens]]</div></div>
|volume=Volume 20
|mention_page=page 262, 264, 269, 337, 338, 340, 341, 342
|treatment_page=page 339
}}<!--

--><span class="statement" id="st-d0_s0" data-properties=""><b>Annuals </b>or short-lived perennials, (7–) 12–40 (–70) cm;</span> <span class="statement" id="st-d0_s1" data-properties="whole-organism atypical some measurement;whole-organism atypical some measurement;whole-organism some measurement;whole-organism architecture;whole-organism duration;whole-organism duration;whole-organism atypical some measurement;whole-organism atypical some measurement;whole-organism some measurement;whole-organism architecture;whole-organism duration;caudex architecture">taprooted, caudices simple if perennial.</span> <span class="statement" id="st-d0_s2" data-properties="stem orientation;stem pubescence;stem architecture or function or pubescence"><b>Stems </b>(single or multiple from bases) erect to ascending, densely and evenly puberulous-hirsutulous (hairs spreading to spreading-descending or ascending, often crinkly, bases not thickened), minutely glandular at least distally, usually throughout.</span> <span class="statement" id="st-d0_s3" data-properties="leaf position;leaf position"><b>Leaves </b>basal (usually deciduous) and cauline;</span> <span class="statement" id="st-d0_s4" data-properties="basal blade shape;basal blade length;basal blade width;cauline blade size;margin architecture or shape;margin architecture or shape;pair quantity;face pubescence;face architecture or function or pubescence">basal blades obovate-spatulate, 10–70 × 4–-14 mm, cauline gradually reduced distally, margins entire or with 2–3 pairs of teeth or lobes, faces hirsute to loosely strigoso-hirsute, sometimes sparsely glandular.</span> <span class="statement" id="st-d0_s5" data-properties="head quantity"><b>Heads </b>(in early season, 1–) 5–100+ (buds nodding).</span> <span class="statement" id="st-d0_s6" data-properties="involucre length;involucre atypical width;involucre width"><b>Involucres </b>3–4 × (5–) 7–11 mm.</span> <span class="statement" id="st-d0_s7" data-properties="phyllarie pubescence;phyllarie architecture or function or pubescence;series quantity"><b>Phyllaries </b>in 3–4 series, hirsute, minutely glandular.</span> <span class="statement" id="st-d0_s8" data-properties="ray-floret quantity"><b>Ray-</b>florets 75–150;</span> <span class="statement" id="st-d0_s9" data-properties="corolla coloration;corolla condition;corolla coloration;corolla atypical some measurement;corolla some measurement;lamina shape;lamina orientation">corollas white, drying lilac, without abaxial midstripe, (2–) 4–9.5 mm, laminae not coiling or reflexing (remaining relatively straight).</span> <span class="statement" id="st-d0_s10" data-properties="disc corolla some measurement"><b>Disc </b>corollas 1.8–2.3 mm (throats indurate and slightly inflated).</span> <span class="statement" id="st-d0_s11" data-properties="cypsela some measurement;cypsela architecture;face pubescence"><b>Cypselae </b>0.9–1.2 mm, 2-nerved (nerves whitish), faces sparsely strigose;</span> <span class="statement" id="st-d0_s12" data-properties="bristle atypical quantity;bristle quantity">pappi: outer of setae or scales, inner of 6–9 (–12) bristles.</span> <span class="statement" id="st-d0_s13" data-properties="2n chromosome quantity;2n chromosome quantity;2n chromosome quantity">2n = 18, 27, 36.</span><!--

-->{{Treatment/Body
|phenology=Flowering (Feb–)Apr–Oct.
|habitat=Gravelly or sandy flats, riverbanks, meadows, disturbed sites, desert scrubland to grasslands, saltbush, blackbrush, sagebrush, pinyon-juniper, juniper-oak, oak, and ponderosa pine woodlands
|elevation=60–2000(–2700) m
|distribution=Alta.;B.C.;Ariz.;Calif.;Colo.;Idaho;Mont.;Nebr.;Nev.;N.Mex.;N.Dak.;Okla.;Oreg.;S.Dak.;Tex.;Utah;Wash.;Wyo.;Mexico (Baja California);Mexico (Chihuahua);Mexico (Coahuila);Mexico (Durango);Mexico (Sonora);Mexico (and southward)
|discussion=<p>Polyploidy and agamospermy apparently are common in Erigeron divergens and contribute to the variability and, probably to some extent, the polymorphism characteristic of this species. Diploids appear to be scattered through the range of the species, at least in its southern part.</p><!--
--><p>The form of Erigeron divergens with persistent, deeply pinnatifid basal leaves with relatively long petioles and tendency toward perenniality (woody taproots) has been named E. accedens [occurs at 200–1000(–1200) m and flowers Feb–Apr(–May)]. Such plants have sometimes been identified as E. lobatus, and it is possible that they may have originated as hybrids with it; in most ways they are similar to E. divergens and apparently intergrade with it. The E. accedens form occurs in California, Arizona, New Mexico, southwest Texas, Baja California, northern Sonora, Durango, and Chihuahua, apparently sympatrically with more typical E. divergens, suggesting that the former is stabilized and self-reproductive (probably agamospermic). Available chromosome counts are triploid. Rare plants (e.g., E. incomptus) may have filiform rays barely extending past the involucre.</p><!--
--><p>Another common form of Erigeron divergens in the broad sense (mostly in Chihuahua, also southern Texas, New Mexico, and Arizona) has bowl-shaped plants with decumbent stems, a discrete taproot, persistent, lobed basal leaves, and solitary heads topping usually simple stems, and usually is early-season in phenology. Further comments related to variation in E. divergens are found under 163. Erigeron multiceps.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Erigeron divergens
|authority=Torrey & A. Gray
|rank=species
|parent rank=genus
|synonyms=Erigeron accedens;Erigeron incomptus;Erigeron solisaltator
|basionyms=Erigeron divaricatus
|family=Asteraceae
|phenology=Flowering (Feb–)Apr–Oct.
|habitat=Gravelly or sandy flats, riverbanks, meadows, disturbed sites, desert scrubland to grasslands, saltbush, blackbrush, sagebrush, pinyon-juniper, juniper-oak, oak, and ponderosa pine woodlands
|elevation=60–2000(–2700) m
|distribution=Alta.;B.C.;Ariz.;Calif.;Colo.;Idaho;Mont.;Nebr.;Nev.;N.Mex.;N.Dak.;Okla.;Oreg.;S.Dak.;Tex.;Utah;Wash.;Wyo.;Mexico (Baja California);Mexico (Chihuahua);Mexico (Coahuila);Mexico (Durango);Mexico (Sonora);Mexico (and southward)
|reference=None
|publication title=Fl. N. Amer.
|publication year=1841
|special status=
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V19-20-21/V20_781.xml
|tribe=Asteraceae tribe Astereae
|genus=Erigeron
|species=Erigeron divergens
|2n chromosome quantity=36;27;18
|basal blade length=10mm;70mm
|basal blade shape=obovate-spatulate
|basal blade width=4mm;14mm
|bristle atypical quantity=9;12
|bristle quantity=6;9
|caudex architecture=simple
|cauline blade size=reduced
|corolla atypical some measurement=2mm;4mm
|corolla coloration=lilac;white
|corolla condition=drying
|corolla some measurement=4mm;9.5mm
|cypsela architecture=2-nerved
|cypsela some measurement=0.9mm;1.2mm
|disc corolla some measurement=1.8mm;2.3mm
|face architecture or function or pubescence=glandular
|face pubescence=strigose;hirsute;loosely strigoso-hirsute
|head quantity=5;100
|involucre atypical width=5mm;7mm
|involucre length=3mm;4mm
|involucre width=7mm;11mm
|lamina orientation=reflexing
|lamina shape=not coiling
|leaf position=cauline;basal
|margin architecture or shape=with 2-3 pairs;entire
|pair quantity=2;3
|phyllarie architecture or function or pubescence=glandular
|phyllarie pubescence=hirsute
|ray-floret quantity=75;150
|series quantity=3;4
|stem architecture or function or pubescence=glandular
|stem orientation=erect;ascending
|stem pubescence=puberulous-hirsutulous
|whole-organism architecture=taprooted;taprooted
|whole-organism atypical some measurement=40cm;70cm
|whole-organism duration=perennial;short-lived;annual
|whole-organism some measurement=12cm;40cm
}}<!--

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