Difference between revisions of "Euphorbia tetrapora"

Engelmann

in W. H. Emory, Rep. U.S. Mex. Bound. 2(1): 191. 1859.

Common names: Weak spurge
Endemic
Synonyms: Tithymalus tetraporus (Engelmann) Small
Treatment appears in FNA Volume 12. Treatment on page 311. Mentioned on page 297.
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|accepted_name=Euphorbia tetrapora
 
|accepted_name=Euphorbia tetrapora
|accepted_authority=Engelmann in W. H. Emory
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|accepted_authority=Engelmann
 
|publications={{Treatment/Publication
 
|publications={{Treatment/Publication
|title=Rep. U.S. Mex. Bound.
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|title=in W. H. Emory, Rep. U.S. Mex. Bound.
 
|place=2(1): 191. 1859
 
|place=2(1): 191. 1859
 
|year=1859
 
|year=1859
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-->{{#Taxon:
 
name=Euphorbia tetrapora
 
name=Euphorbia tetrapora
|authority=Engelmann in W. H. Emory
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|authority=Engelmann
 
|rank=species
 
|rank=species
 
|parent rank=subgenus
 
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|distribution=La.;Okla.;Tex.
 
|distribution=La.;Okla.;Tex.
 
|reference=None
 
|reference=None
|publication title=Rep. U.S. Mex. Bound.
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|publication title=in W. H. Emory, Rep. U.S. Mex. Bound.
 
|publication year=1859
 
|publication year=1859
 
|special status=Endemic
 
|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
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|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V12/V12_390.xml
 
|genus=Euphorbia
 
|genus=Euphorbia
 
|subgenus=Euphorbia subg. Esula
 
|subgenus=Euphorbia subg. Esula

Latest revision as of 20:15, 5 November 2020

Herbs, annual, with taproot. Stems erect, unbranched, 7–20 cm, glabrous. Leaves: 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. Cyathial 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. Cyathia: peduncle 0.2–0.6 mm. Involucre 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. Staminate flowers 10–15. Pistillate flowers: ovary smooth, glabrous; styles 0.6–1 mm, 2-fid. Capsules 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. Seeds 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.


Phenology: Flowering and fruiting spring.
Habitat: Sandy soils, dry open woods.
Elevation: 0–300 m.

Discussion

Euphorbia tetrapora 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 E. tetrapora.

Selected References

None.

Lower Taxa

None.
... more about "Euphorbia tetrapora"
Ricarda Riina +, Dmitry V. Geltman +, Jess A. Peirson +  and Paul E. Berry +
Engelmann +
Weak spurge +
La. +, Okla. +  and Tex. +
0–300 m. +
Sandy soils, dry open woods. +
Flowering and fruiting spring. +
in W. H. Emory, Rep. U.S. Mex. Bound. +
Tithymalus tetraporus +
Euphorbia tetrapora +
Euphorbia subg. Esula +
species +