Atriplex powellii var. minuticarpa

(Stutz & G. L. Chu) S. L. Welsh

Rhodora 102: 421. 2001

Common names: Smallbract orach
Basionyms: Atriplex minuticarpa Stutz & G. L. Chu Madroño 40: 161, fig. 1. 1993
Treatment appears in FNA Volume 4. Treatment on page 353. Mentioned on page 352.
Herbs, monoecious, (0.5–)1–4.5 dm. Leaves on petioles 0.3–1.5(–2) cm proximally, becoming sessile distally, blade inconspicuously 3-veined, deltoid-ovate to orbicular-ovate or cordate-ovate, 5–20(–30) mm and as wide, base broadly cuneate to subcordate, apex acute to shortly acuminate, scurfy. Flowers of both sexes intermixed in axillary glomerules. Staminate flowers 5-merous. Fruiting bracteoles ovate-oblong or oval to obovate, 1.5–2.5 × 1–2.5 mm, subentire to tridentate apically, median tooth largest, lateral lobes often rounded and sometimes constricted basally, giving an overall violin shape, sometimes slenderly appendaged marginally and bicristate on at least 1 face, but typically unappendaged on faces. Seeds yellow-brown, 0.9–1.2 mm.

Phenology: Flowering spring–fall.
Habitat: Tununk and Blue Gate members Mancos Shale Formation and on Morrison Formation, and likely on other fine-textured saline substrates, with mat-atriplex, greasewood, rabbitbrush, and shadscale communities
Elevation: 1200-1400 m

Discussion

This entity is completely within the distribution of </i>var.<i> powellii in southeast Utah, where it occurs on the fine-textured saline and seleniferous silts and clays of exposed Jurassic and Cretaceous strata. The habits of growth of the two taxa are essentially identical, and the shape of both the foliage and bracteate leaves is essentially the same. The fruiting bracteoles of </i>var.<i> minuticarpa, though small, occasionally bear finger-like surficial appendages and share the rounded lateral lobes marginal to the terminal cusp and violin shape with </i>var.<i> powellii. This small-bracteolate plant evidently occupies a much more limited set of ecological circumstances than its near ally.

References

None.

Lower Taxa

No lower taxa listed.

AuthorStanley L. Welsh +
Authority(Stutz & G. L. Chu) S. L. Welsh +
BasionymsAtriplex minuticarpa +
Common nameSmallbract orach +
DistributionUtah. +
Elevation1200-1400 m +
HabitatTununk and Blue Gate members Mancos Shale Formation and on Morrison Formation, and likely on other fine-textured saline substrates, with mat-atriplex, greasewood, rabbitbrush, and shadscale communities +
IllustratorBee F. Gunn +
PhenologyFlowering spring–fall. +
Publication titleRhodora +
Publication year2001 +
ReferenceNone +
Source xmlhttps://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse grained fna xml/V4/V4 679.xml +
SynonymsObione powellii +
Taxon familyChenopodiaceae +
Taxon nameAtriplex powellii var. minuticarpa +
Taxon parentAtriplex powellii +
Taxon rankvariety +
VolumeVolume 4 +