View source for Euphorbia tetrapora

{{Treatment/ID
|accepted_name=Euphorbia tetrapora
|accepted_authority=Engelmann in W. H. Emory
|publications={{Treatment/Publication
|title=Rep. U.S. Mex. Bound.
|place=2(1): 191. 1859
|year=1859
}}
|common_names=Weak spurge
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Tithymalus tetraporus
|authority=(Engelmann) Small
|rank=species
}}
|hierarchy=Euphorbiaceae;Euphorbia;Euphorbia subg. Esula;Euphorbia tetrapora
|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>subgenus</small>[[Euphorbia subg. Esula]]</div><div class="higher-taxon"><small>species</small>[[Euphorbia tetrapora]]</div></div>
|volume=Volume 12
|mention_page=page 297
|treatment_page=page 311
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs,</b> annual, with taproot. <b>Stems</b> erect, unbranched, 7–20 cm, glabrous. <b>Leaves</b>: petiole 1–2 mm, reduced distally; blade spatulate-cuneate, 8–10 × 4–5 mm (greatly reduced in size proximally), base cuneate, margins entire, apex rounded to emarginate or obcordate, surfaces glabrous; venation pinnate. <b>Cyathial</b> arrangement: terminal pleiochasial branches 3, each 1–3(–4) times 2-branched; pleiochasial bracts obovate, similar in size to distal leaves; dichasial bracts distinct or basally subconnate, not imbricate, triangular-ovate, base truncate or cordate, margins entire, apex mucronate; axillary cymose branches 1–4. <b>Cyathia</b>: peduncle 0.2–0.6 mm. <b>Involucre</b> campanulate, 0.8–1.1 × 0.7–1 mm, glabrous; glands 4, elliptic to trapezoidal, 0.3–0.6 × 0.6–1.2 mm; horns divergent, 0.5–1 mm. <b>Staminate</b> flowers 10–15. <b>Pistillate</b> flowers: ovary smooth, glabrous; styles 0.6–1 mm, 2-fid. <b>Capsules</b> depressed-globose, 1.8–2.2 × 2.2–2.9 mm, slightly lobed; cocci rounded to slightly flattened, smooth, glabrous; columella 1.5–1.8 mm. <b>Seeds</b> reddish brown to brown, often glaucous, oblong, 1.3–1.4 × 0.8–0.9 mm, abaxial faces with 15–20 shallow pits or almost smooth, adaxial faces with 4–6 large shallow pits or irregular oblong grooves; caruncle conic, hat-shaped, 0.3–0.4 × 0.4–0.6 mm.</span><!--

-->{{Treatment/Body
|phenology=Flowering and fruiting spring.
|habitat=Sandy soils, dry open woods.
|elevation=0–300 m.
|distribution=La.;Okla.;Tex.
|discussion=<p><i>Euphorbia tetrapora</i> is endemic to a portion of the western Gulf coastal plain. D. S. Correll and M. C. Johnston (1970) included Alabama and Georgia in the distribution of this species as well, probably due to Engelmann’s citation of a Georgia specimen from the herbarium of Samuel Boykin. Whether the Boykin specimen came from Georgia, where Boykin was based, is unclear. Because no records to support its occurrence in the eastern Gulf coastal plain (Alabama or Georgia) have been found, those states are here excluded from the distribution of <i>E. tetrapora</i>.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Euphorbia tetrapora
|authority=Engelmann in W. H. Emory
|rank=species
|parent rank=subgenus
|synonyms=Tithymalus tetraporus
|basionyms=
|family=Euphorbiaceae
|phenology=Flowering and fruiting spring.
|habitat=Sandy soils, dry open woods.
|elevation=0–300 m.
|distribution=La.;Okla.;Tex.
|reference=None
|publication title=Rep. U.S. Mex. Bound.
|publication year=1859
|special status=Endemic
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V12/V12_390.xml
|genus=Euphorbia
|subgenus=Euphorbia subg. Esula
|species=Euphorbia tetrapora
}}<!--

-->[[Category:Treatment]][[Category:Euphorbia subg. Esula]]