View source for Euphorbia geyeri

{{Treatment/ID
|accepted_name=Euphorbia geyeri
|accepted_authority=Engelmann
|publications={{Treatment/Publication
|title=Boston J. Nat. Hist.
|place=5: 260. 1845
|year=1845
}}
|common_names=Geyer’s sandmat
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Chamaesyce geyeri
|authority=(Engelmann) Small
|rank=species
}}
|hierarchy=Euphorbiaceae;Euphorbia;Euphorbia sect. Anisophyllum;Euphorbia geyeri
|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. Anisophyllum]]</div><div class="higher-taxon"><small>species</small>[[Euphorbia geyeri]]</div></div>
|volume=Volume 12
|mention_page=page 258, 262
|treatment_page=page 268
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs,</b> annual, with taproot. <b>Stems</b> prostrate or slightly ascending, loosely mat-forming, 4–25(–45) cm, glabrous. <b>Leaves</b> opposite; stipules usually distinct, occasionally connate basally on lower side, usually deeply parted into 3 or more filiform segments, 0.7–1.5 mm, glabrous; petiole 1–2 mm, glabrous; blade oblong to oblong-obovate or oblong-elliptic, 4–12 × 2–6 mm, base slightly asymmetric, angled or rounded, with one side usually expanded into small, rounded auricle, margins entire, apex usually truncate, occasionally emarginate, abaxial surface pale grayish green, both surfaces glabrous; only midvein conspicuous or venation obscurely pinnate (larger leaves). <b>Cyathia</b> solitary or in small, cymose clusters at distal nodes; peduncle 1–2 mm. <b>Involucre</b> broadly campanulate, 1–1.5 × 0.7–0.9 mm, glabrous; glands 4, green to reddish, elliptic-oblong to nearly circular, slightly cupped to folded, 0.2–0.4 × 0.2–0.6 mm; appendages rudimentary to absent or white to reddish-tinged, usually rounded, sometimes pointed, (0–)0.5–1 × (0–)0.1–1.2 mm, distal margin entire or slightly toothed. <b>Staminate</b> flowers 5–20. <b>Pistillate</b> flowers: ovary glabrous; styles 0.2–0.6 mm, 2-fid nearly 1/2 length. <b>Capsules</b> globose-ovoid, 1.5–2 × 1.5–3 mm, glabrous; columella 1.5–1.9 mm. <b>Seeds</b> ashy white, ovoid, terete to bluntly subangled in cross section, 1.1–1.7 × 0.9–1.2 mm, smooth, with smooth brown line from top to bottom on adaxial side.</span><!--

-->{{Treatment/Body
|distribution=Man.;Colo.;Ill.;Ind.;Iowa;Kans.;La.;Mich.;Minn.;Miss.;Mo.;Mont.;N.Dak.;N.Mex.;Nebr.;Okla.;S.Dak.;Tex.;Utah;Wis.;Wyo.;n Mexico.
|discussion=<p>Varieties 2 (2 in the flora).</p><!--
--><p>The two varieties of <i>Euphorbia geyeri</i> have been distinguished in large part by the presence of conspicuous involucral gland appendages in <i></i>var.<i> geyeri</i> and the lack of appendages in <i></i>var.<i> wheeleriana</i>. The two varieties are recognized here, but the variation in the size and presence of involucral gland appendages in the closely related <i>E. bombensis</i> suggests that this might be a somewhat variable character in this group of species.</p><!--
--><p><i>Euphorbia geyeri</i> is widespread throughout the central United States in sandy soils. Populations at the eastern edge of the range are often considered adventive (for example, sandy soils along railroad grades in Michigan). <i>Euphorbia geyeri</i> resembles <i>E. glyptosperma</i> (both being entirely glabrous), but that species has serrulate leaves (near the apex) and strongly angled, transverse-ridged seeds whereas <i>E. geyeri</i> has entire leaves and smooth, rounded seeds.</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Involucral gland appendages present; staminate flowers 5–9; seeds 1.1–1.4(–1.6) mm.
|[[Euphorbia geyeri var. geyeri|Euphorbia geyeri var. geyeri]]
|-id=key-0-1
|1
|Involucral gland appendages absent or rudimentary; staminate flowers 10–20; seeds 1.6–1.7 mm.
|[[Euphorbia geyeri var. wheeleriana|Euphorbia geyeri var. wheeleriana]]
|}
</div></div><!--

-->{{#Taxon:
name=Euphorbia geyeri
|authority=Engelmann
|rank=species
|parent rank=section
|synonyms=Chamaesyce geyeri
|basionyms=
|family=Euphorbiaceae
|distribution=Man.;Colo.;Ill.;Ind.;Iowa;Kans.;La.;Mich.;Minn.;Miss.;Mo.;Mont.;N.Dak.;N.Mex.;Nebr.;Okla.;S.Dak.;Tex.;Utah;Wis.;Wyo.;n Mexico.
|reference=None
|publication title=Boston J. Nat. Hist.
|publication year=1845
|special status=
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V12/V12_17.xml
|genus=Euphorbia
|section=Euphorbia sect. Anisophyllum
|species=Euphorbia geyeri
}}<!--

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