Difference between revisions of "Eriogonum microtheca var. ambiguum"

(M. E. Jones) Reveal

in P. A. Munz, Suppl. Calif. Fl., 61. 1968.

Common names: Yellow-flowered wild buckwheat
Endemic
Basionym: Eriogonum aureum var. ambiguum M. E. Jones Proc. Calif. Acad. Sci., ser. 2, 5: 719. 1895
Treatment appears in FNA Volume 5. Treatment on page 247. Mentioned on page 243.
imported>Volume Importer
m (Corrected spelling of specific epithet from "microthecum" to "microtheca".)
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{{Treatment/ID
 
{{Treatment/ID
|accepted_name=Eriogonum microthecum var. ambiguum
+
|accepted_name=Eriogonum microtheca var. ambiguum
 
|accepted_authority=(M. E. Jones) Reveal
 
|accepted_authority=(M. E. Jones) Reveal
 
|publications={{Treatment/Publication
 
|publications={{Treatment/Publication
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}}
 
}}
 
|synonyms=
 
|synonyms=
|hierarchy=Polygonaceae;Polygonaceae subfam. Eriogonoideae;Eriogonum;Eriogonum subg. Eucycla;Eriogonum microthecum;Eriogonum microthecum var. ambiguum
+
|hierarchy=Polygonaceae;Polygonaceae subfam. Eriogonoideae;Eriogonum;Eriogonum subg. Eucycla;Eriogonum microtheca;Eriogonum microtheca var. ambiguum
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Polygonaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Polygonaceae subfam. Eriogonoideae]]</div><div class="higher-taxon"><small>genus</small>[[Eriogonum]]</div><div class="higher-taxon"><small>subgenus</small>[[Eriogonum subg. Eucycla]]</div><div class="higher-taxon"><small>species</small>[[Eriogonum microthecum]]</div><div class="higher-taxon"><small>variety</small>[[Eriogonum microthecum var. ambiguum]]</div></div>
+
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Polygonaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Polygonaceae subfam. Eriogonoideae]]</div><div class="higher-taxon"><small>genus</small>[[Eriogonum]]</div><div class="higher-taxon"><small>subgenus</small>[[Eriogonum subg. Eucycla]]</div><div class="higher-taxon"><small>species</small>[[Eriogonum microtheca]]</div><div class="higher-taxon"><small>variety</small>[[Eriogonum microtheca var. ambiguum]]</div></div>
 
|volume=Volume 5
 
|volume=Volume 5
 
|mention_page=page 243
 
|mention_page=page 243
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-->{{#Taxon:
name=Eriogonum microthecum var. ambiguum
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name=Eriogonum microtheca var. ambiguum
 
|authority=(M. E. Jones) Reveal
 
|authority=(M. E. Jones) Reveal
 
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|rank=variety
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|genus=Eriogonum
 
|genus=Eriogonum
 
|subgenus=Eriogonum subg. Eucycla
 
|subgenus=Eriogonum subg. Eucycla
|species=Eriogonum microthecum
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|species=Eriogonum microtheca
|variety=Eriogonum microthecum var. ambiguum
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|variety=Eriogonum microtheca var. ambiguum
 
}}<!--
 
}}<!--
  
-->[[Category:Treatment]][[Category:Eriogonum microthecum]]
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-->[[Category:Treatment]][[Category:Eriogonum microtheca]]

Revision as of 20:10, 27 October 2022

Subshrubs or shrubs, 0.5–5 × 1–8 dm. Stems: caudex absent; aerial flowering stems 0.2–1 dm, mostly floccose. Leaves: blade 0.8–2.5 × (0.2–)0.3–0.6(–0.8) cm, densely white- or reddish-brown-tomentose abaxially, floccose adaxially, margins rarely revolute. Inflorescences 1–5(–12) cm; branches tomentose to floccose. Involucres 2–2.5 mm, tomentose to floccose. Flowers (1.5–)2–2.5(–3) mm; perianth yellow. Achenes 1.5–2 mm.


Phenology: Flowering Jul–Sep.
Habitat: Sandy to rocky soil, sagebrush and saltbush communities, pinyon-juniper and conifer woodlands
Elevation: (1100-)1900-3300 m

Distribution

V5 458-distribution-map.gif

Calif., Idaho, Nev., Oreg.

Discussion

Variety ambiguum occurs in eastern California, northwestern Nevada, and southeastern Oregon. In portions of its range, var. ambiguum appears to be little more than a yellow-flowered phase of var. laxiflorum. However, where the two occur together, intermediates are rarely found, and limited garden studies indicate that flower color is genetically fixed. Nonflowering specimens from southern Owyhee County, Idaho, have been tentatively assigned to this taxon.

Selected References

None.

Lower Taxa

None.
James L. Reveal +
(M. E. Jones) Reveal +
Eriogonum aureum var. ambiguum +
Yellow-flowered wild buckwheat +
Calif. +, Idaho +, Nev. +  and Oreg. +
(1100-)1900-3300 m +
Sandy to rocky soil, sagebrush and saltbush communities, pinyon-juniper and conifer woodlands +
Flowering Jul–Sep. +
in P. A. Munz, Suppl. Calif. Fl., +
Eriogonum microtheca var. ambiguum +
Eriogonum microtheca +
variety +