View source for Euphorbia aaron-rossii

{{Treatment/ID
|accepted_name=Euphorbia aaron-rossii
|accepted_authority=A. H. Holmgren & N. H. Holmgren
|publications={{Treatment/Publication
|title=Brittonia
|place=40: 357, figs. 1, 2. 1988
|year=1988
}}
|common_names=Ross's or Marble Canyon spurge
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}{{Treatment/ID/Special_status
|code=C
|label=Conservation concern
}}
|basionyms=
|synonyms=
|hierarchy=Euphorbiaceae;Euphorbia;Euphorbia sect. Alectoroctonum;Euphorbia aaron-rossii
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Euphorbiaceae]]</div><div class="higher-taxon"><small>genus</small>[[Euphorbia]]</div><div class="higher-taxon"><small>section</small>[[Euphorbia sect. Alectoroctonum]]</div><div class="higher-taxon"><small>species</small>[[Euphorbia aaron-rossii]]</div></div>
|volume=Volume 12
|mention_page=page 241, 251
|treatment_page=page 242
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs,</b> perennial, with deep stout rootstock. <b>Stems</b> erect, branched, densely clumped, previous year’s dead stems persistent, 25–45(–60) cm, glabrous, striate. <b>Leaves</b> alternate, persisting, usually reflexed, occasionally spreading; stipules 0.1–0.3 mm; petiole 0.2–2.2 mm, glabrous; blade narrowly ovate to lanceolate proximally, narrowly lanceolate, linear, or filiform distally, 10–32 × 0.5–6.5 mm, base cuneate, margins entire, apex acute, surfaces pilose when young, sparsely strigose or glabrous with age; venation obscure, only midvein conspicuous. <b>Cyathia</b> in terminal monochasia (thus appearing solitary at alternate nodes); peduncle 0.5–2.5 (or 10–25) mm, glabrous or sparsely strigose. <b>Involucre</b> turbinate to campanulate, 2.2–3.7 × 1.5–2.5 mm, moderately strigose; glands 5, dark green, reniform, 0.7–1.1 × 1–1.6 mm; appendages white to pink, flabellate, 0.5–1.5 × 0.8–2.2 mm, dentate or erose. <b>Staminate</b> flowers 20–25. <b>Pistillate</b> flowers: ovary strigose; styles 1–1.3 mm, 2-fid at apex. <b>Capsules</b> subglobose, 2–3 × 4 mm, sparsely strigose; columella 2–3 mm. <b>Seeds</b> gray-green to gray-brown, globose-ovoid, 1.8–2.2 × 1.2–1.6 mm, longitudinally pitted; caruncle absent.</span><!--

-->{{Treatment/Body
|phenology=Flowering and fruiting spring–fall.
|habitat=Sandy soils and dunes, occasionally rocky slopes, riparian areas.
|elevation=600–1300 m.
|distribution=Ariz.
|discussion=<p><i>Euphorbia aaron-rossii</i> is restricted to the banks of the Colorado River in several small areas of the Grand and Marble canyons. The species is most closely related to <i>E. strictior</i> and <i>E. wrightii</i>, but due to its rarity, it has not been extensively studied.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Euphorbia aaron-rossii
|author=
|authority=A. H. Holmgren & N. H. Holmgren
|rank=species
|parent rank=section
|synonyms=
|basionyms=
|family=Euphorbiaceae
|phenology=Flowering and fruiting spring–fall.
|habitat=Sandy soils and dunes, occasionally rocky slopes, riparian areas.
|elevation=600–1300 m.
|distribution=Ariz.
|reference=None
|publication title=Brittonia
|publication year=1988
|special status=Endemic;Conservation concern
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V12/V12_50.xml
|genus=Euphorbia
|section=Euphorbia sect. Alectoroctonum
|species=Euphorbia aaron-rossii
}}<!--

-->[[Category:Treatment]][[Category:Euphorbia sect. Alectoroctonum]]