View source for Artemisia arbuscula

{{Treatment/ID
|accepted_name=Artemisia arbuscula
|accepted_authority=Nuttall
|publications={{Treatment/Publication
|title=Trans. Amer. Philos. Soc., n. s.
|place=7: 398. 1841
|year=1841
}}
|common_names=Low sagebrush
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Artemisia tridentata subsp. arbuscula
|authority=(Nuttall) H. M. Hall & Clements
|rank=subspecies
}} {{Treatment/ID/Synonym
|name=Artemisia tridentata var. arbuscula
|authority=(Nuttall) McMinn
|rank=variety
}} {{Treatment/ID/Synonym
|name=Seriphidium arbusculum
|authority=
|rank=species
}}
|hierarchy=Asteraceae;Asteraceae tribe Anthemideae;Artemisia;Artemisia subg. Tridentatae;Artemisia arbuscula
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Asteraceae]]</div><div class="higher-taxon"><small>tribe</small>[[Asteraceae tribe Anthemideae]]</div><div class="higher-taxon"><small>genus</small>[[Artemisia]]</div><div class="higher-taxon"><small>subgenus</small>[[Artemisia subg. Tridentatae]]</div><div class="higher-taxon"><small>species</small>[[Artemisia arbuscula]]</div></div>
|volume=Volume 19
|mention_page=page 512, 514, 515
|treatment_page=page 511
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Shrubs,</b> 10–30(–50) cm, aromatic; root-sprouting. <b>Stems</b> gray-green to brown, glabrate (diffusely branched from bases, brittle). <b>Leaves</b> (vegetative stems) persistent, gray-green; blades broadly to narrowly cuneate, 3–10 × 2–5 mm, lobed (lobes 3, oblong-linear, to 1/3 blade lengths, mostly 1–3 mm wide, flat, obtuse, laterals sometimes 2–3-fid; leaves on flowering stems deciduous, blades narrowly cuneate, deeply 3-lobed), faces densely hairy (not sticky resinous). <b>Heads</b> usually borne singly, rarely (1–4, erect, mostly sessile, in pedunculate clusters) in spiciform or paniculiform arrays 2–9 × 0.5–2 cm (branches slender). <b>Involucres</b> campanulate or globose-ovoid, (1.5–)2–4(–5) × 1.5–4.5 mm. <b>Phyllaries</b> (margins green) ovate (outer) to oblong, pubescent or tomentose. <b>Florets</b> 4–6(–10); corollas 1.5–2 mm, glabrous. <b>Cypselae</b> (light brown) 0.7–0.8 mm, resinous.</span><!--

-->{{Treatment/Body
|distribution=Calif.;Colo.;Idaho;Mont.;Nev.;Oreg.;Utah;Wash.;Wyo.
|discussion=<p>Subspecies 3 (3 in the flora).</p><!--
--><p><i>Artemisia arbuscula</i> is one of the more perplexing species in the Tridentatae complex. Anatomic and morphologic characteristics suggest multiple hybrid origins for the subspecies. Deciduous leaves of flowering stems in plants that otherwise have persistent leaves suggest a hybrid origin involving plants of the <i>A. tridentata</i> and <i>A. cana</i> lineages. In most instances, populations of <i>A. arbuscula</i> appear to be reproductively stable. The disposition of <i>Artemisia arbuscula</i> subsp. longicaulis Winward & McArthur (with 2n = 54) has not been determined.</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Involucres 2–4.5 mm diam.; usually in rocky soils; flowering mid–late summer
|[[Artemisia arbuscula subsp. arbuscula|Artemisia arbuscula subsp. arbuscula]]
|-id=key-0-1
|1
|Involucres 1.5–2.5 mm diam.; clays or stony soils; flowering early spring–late summer
|[[#key-0-2| > 2]]
|-id=key-0-2
|2
|Leaves broadly cuneate (4–10 × 2–5 mm, often irregularly lobed, lobes rounded, middle lobes overlapping lateral lobes); usually in clay soils; flower- ing early spring
|[[Artemisia arbuscula subsp. longiloba|Artemisia arbuscula subsp. longiloba]]
|-id=key-0-2
|2
|Leaves narrowly cuneate (5–10 × 3–6 mm, lobed, lobes 1/2+ blade lengths, laterals to 1 mm wide, of-ten acute); usually in stony soils; flowering mid–late summer
|[[Artemisia arbuscula subsp. thermopola|Artemisia arbuscula subsp. thermopola]]
|}
</div></div><!--

-->{{#Taxon:
name=Artemisia arbuscula
|authority=Nuttall
|rank=species
|parent rank=subgenus
|synonyms=Artemisia tridentata subsp. arbuscula;Artemisia tridentata var. arbuscula;Seriphidium arbusculum
|basionyms=
|family=Asteraceae
|distribution=Calif.;Colo.;Idaho;Mont.;Nev.;Oreg.;Utah;Wash.;Wyo.
|reference=None
|publication title=Trans. Amer. Philos. Soc., n. s.
|publication year=1841
|special status=Endemic
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V19_862.xml
|tribe=Asteraceae tribe Anthemideae
|genus=Artemisia
|subgenus=Artemisia subg. Tridentatae
|species=Artemisia arbuscula
}}<!--

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[[Category:Treatment]]
[[Category:Artemisia subg. Tridentatae]]
[[Category:Revised Since Print]]