View source for Erigeron compositus

{{Treatment/ID
|accepted_name=Erigeron compositus
|accepted_authority=Pursh
|publications={{Treatment/Publication
|title=Fl. Amer. Sept.
|place=2: 535. 1813
|year=1813
}}
|common_names=Dwarf mountain fleabane;vergerette à feuilles segmentées
|special_status={{Treatment/ID/Special_status
|code=F
|label=Illustrated
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Erigeron compositus var. discoideus
|authority=A. Gray
|rank=variety
}} {{Treatment/ID/Synonym
|name=Erigeron compositus var. glabratus
|authority=Macoun
|rank=variety
}} {{Treatment/ID/Synonym
|name=Erigeron compositus var. multifidus
|authority=(Rydberg) J. F. Macbride & Payson
|rank=variety
}} {{Treatment/ID/Synonym
|name=Erigeron gormanii
|authority=
|rank=species
}}
|hierarchy=Asteraceae;Asteraceae tribe Astereae;Erigeron;Erigeron compositus
|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 compositus]]</div></div>
|volume=Volume 20
|mention_page=page 258, 260, 265, 301
|treatment_page=page 300
}}<!--

--><span class="statement" id="st-d0_s0" data-properties=""><b>Perennials,</b> 5–15 (–25 cm);</span> <span class="statement" id="st-d0_s1" data-properties="whole-organism quantity;whole-organism architecture;whole-organism duration;caudex architecture;branch width;branch height or length or size;branch size;branch architecture;leaf-base duration">taprooted, caudices simple or branches usually relatively thick and short, rarely slender and rhizomelike, covered with persistent leaf-bases.</span> <span class="statement" id="st-d0_s2" data-properties="stem orientation;stem pubescence;stem architecture or function or pubescence"><b>Stems </b>erect (simple, ± scapiform), sparsely hispido-pilose, minutely glandular.</span> <span class="statement" id="st-d0_s3" data-properties="leaf position"><b>Leaves </b>mostly basal (persistent);</span> <span class="statement" id="st-d0_s4" data-properties="blade shape;blade atypical length;blade length;blade atypical width;blade width;margin shape;margin shape;cauline blade shape;cauline blade architecture or shape;face pubescence;face architecture or function or pubescence">blades spatulate to obovate-spatulate, 5–50 (–70) × (2–) 4–12 mm, margins (1–) 2–3 (–4) -ternately lobed or dissected, cauline bractlike, mostly entire, faces densely hispiduloso-puberulent to glabrate, minutely glandular.</span> <span class="statement" id="st-d0_s5" data-properties="head quantity"><b>Heads </b>(sometimes disciform) 1.</span> <span class="statement" id="st-d0_s6" data-properties="involucre length;involucre width"><b>Involucres </b>5–10 × 8–20 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 2–3 series (purple-tipped), hirsute (hairs spreading), minutely glandular.</span> <span class="statement" id="st-d0_s8" data-properties="ray floret quantity"><b>Ray </b>(pistillate) florets 20–60;</span> <span class="statement" id="st-d0_s9" data-properties="corolla coloration;corolla some measurement;corolla size;lamina shape;lamina orientation">corollas white to pink or blue, usually 6–12 mm, often reduced to tubes (heads disciform), laminae not coiling or reflexing.</span> <span class="statement" id="st-d0_s10" data-properties="disc corolla some measurement"><b>Disc </b>corollas 3–5 mm.</span> <span class="statement" id="st-d0_s11" data-properties="cypsela some measurement;cypsela architecture;face pubescence"><b>Cypselae </b>1.6–2.7 mm, 2-nerved, faces sparsely strigose-hirsute;</span> <span class="statement" id="st-d0_s12" data-properties="seta presence;bristle quantity">pappi: outer usually of setae, sometimes 0, inner of 12–20 bristles.</span> <span class="statement" id="st-d0_s13" data-properties="pappus position;2n chromosome quantity;2n chromosome quantity;2n chromosome quantity;2n chromosome quantity">2n = 18, 36, 45, 54.</span><!--

-->{{Treatment/Body
|phenology=Flowering (May–)Jun–Aug.
|habitat=Sagebrush, rabbitbrush, aspen to aspen-fir, subalpine meadows, cliffs, talus, and boulders
|elevation=(in e Canada, possibly Greenland and Arctic bridge gap, 10–200–)1800–4300 m
|distribution=Greenland;Alta.;B.C.;Nfld. and Labr. (Nfld.);N.W.T.;Nunavut;Que.;Sask.;Yukon;Alaska;Ariz.;Calif.;Colo.;Idaho;Mont.;Nev.;N.Dak.;Oreg.;S.Dak.;Utah;Wash.;Wyo.;e Asia (Russian Far East)
|discussion=<p>Correlations among ploidal level, breeding systems, and morphologic variation have been studied in detail in Erigeron compositus. Five informally designated population systems of diploids are geographically restricted (all of the northwestern United States and adjacent Canada) and primarily sexual, compared to the polyploids, which are agamospermous and apparently of hybrid origin, at least in some cases (R. D. Noyes et al. 1995; Noyes and D. E. Soltis 1996). Reduction in ray floret laminae usually is correlated with polyploidy. Plants with 1-ternately lobed leaves have been identified as var. glabratus, an element of variation that does not have a geographic pattern.</p><!--
--><p>Among closely related species, Erigeron compositus is the only one that produces strongly thickened caudex branches; occasional collections show a tendency toward the slender, loose branches characteristic of the other species.</p>
|tables=
|references={{Treatment/Reference
|id=noyes1995a
|text=Noyes, R. D., D. E. Soltis, and P. S. Soltis. 1995. Genetic and cytological investigations in sexual Erigeron compositus (Astereaceae). Syst. Bot. 20: 132–146.
}}{{Treatment/Reference
|id=noyes1996a
|text=Noyes, R. D. and D. E. Soltis. 1996. Genotypic variation in agamospermous Erigeron compositus (Asteraceae). Amer. J. Bot. 83: 1292–1303.
}}
}}<!--

--><!--

-->{{#Taxon:
name=Erigeron compositus
|authority=Pursh
|rank=species
|parent rank=genus
|synonyms=Erigeron compositus var. discoideus;Erigeron compositus var. glabratus;Erigeron compositus var. multifidus;Erigeron gormanii
|basionyms=
|family=Asteraceae
|phenology=Flowering (May–)Jun–Aug.
|habitat=Sagebrush, rabbitbrush, aspen to aspen-fir, subalpine meadows, cliffs, talus, and boulders
|elevation=(in e Canada, possibly Greenland and Arctic bridge gap, 10–200–)1800–4300 m
|distribution=Greenland;Alta.;B.C.;Nfld. and Labr. (Nfld.);N.W.T.;Nunavut;Que.;Sask.;Yukon;Alaska;Ariz.;Calif.;Colo.;Idaho;Mont.;Nev.;N.Dak.;Oreg.;S.Dak.;Utah;Wash.;Wyo.;e Asia (Russian Far East)
|reference=noyes1995a;noyes1996a
|publication title=Fl. Amer. Sept.
|publication year=1813
|special status=Illustrated
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V19-20-21/V20_642.xml
|tribe=Asteraceae tribe Astereae
|genus=Erigeron
|species=Erigeron compositus
|2n chromosome quantity=54;45;36;18
|blade atypical length=50mm;70mm
|blade atypical width=2mm;4mm
|blade length=5mm;50mm
|blade shape=spatulate;obovate-spatulate
|blade width=4mm;12mm
|branch architecture=rhizomelike
|branch height or length or size=short
|branch size=slender
|branch width=thick
|bristle quantity=12;20
|caudex architecture=simple
|cauline blade architecture or shape=entire
|cauline blade shape=bractlike
|corolla coloration=white;pink or blue
|corolla size=reduced
|corolla some measurement=6mm;12mm
|cypsela architecture=2-nerved
|cypsela some measurement=1.6mm;2.7mm
|disc corolla some measurement=3mm;5mm
|face architecture or function or pubescence=glandular
|face pubescence=strigose-hirsute;densely hispiduloso-puberulent;glabrate
|head quantity=1
|involucre length=5mm;10mm
|involucre width=8mm;20mm
|lamina orientation=reflexing
|lamina shape=not coiling
|leaf position=basal
|leaf-base duration=persistent
|margin shape=dissected;lobed
|pappus position=outer
|phyllarie architecture or function or pubescence=glandular
|phyllarie pubescence=hirsute
|ray floret quantity=20;60
|series quantity=2;3
|seta presence=absent
|stem architecture or function or pubescence=glandular
|stem orientation=erect
|stem pubescence=hispido-pilose
|whole-organism architecture=taprooted
|whole-organism duration=perennial
|whole-organism quantity=5;15
}}<!--

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