Atriplex argentea var. rydbergii
Rhodora 102: 421. 2001
Phenology: Flowering summer–fall.
Habitat: Saline, fine-textured substrates derived mainly from Mancos Shale and Morrison formations and clay or silty alluvium, growing in salt desert shrub and floodplain communities
Elevation: 1200-2100 m
Ariz., Colo., N.Mex., Utah.
In their extreme expression, the leaves of Atriplex argentea var. rydbergii are narrowly elliptic, tapering to both ends, but those extreme forms are connected through a graded series with oval-ovate ones, which tend to maintain the acute-cuneate base, however. The broad-leaved forms are intermediate to </i>var.<i> argentea. Tapering of leaf base to petiole is not restricted to this variety, however. Similar leaf shape occurs rather widely through the species as a whole, but in no place is it so consistently geographically correlated as in the Four Corners region.
H. C. Stutz and G. L. Chu (1997) compared their newly proposed Atriplex pachypoda from southwest Colorado and northwest New Mexico with the A. caput-medusae phase of what is considered herein as A. saccaria var. saccaria. Fruiting bracteole shape, marginal tooth arrangement, and compression are so strikingly similar to those of the A. argentea complex that the relationship with the latter group is apparent. Indeed, the closely contiguous </i>var.<i> rydbergii is nearly identical in all except subtle differences in bracteole shape and the disposition of staminate flowers in a terminal spike or panicle, which is apparently not an entirely constant feature. Arrangement of staminate flowers in terminal spikes appears at once to be a striking feature of </i>var.<i> rydbergii, but the spikes are evanescent, often lacking by fruiting time. And, there are some specimens of that variety in which the staminate flowers were evidently mainly, if not entirely, in axillary glomerules. Because of the similarities to </i>var.<i> rydbergii and the inconsistence of characteristics regarded by its authors as diagnostic, A. pachypoda is herein relegated to synonymy.
|Author||Stanley L. Welsh +|
|Authority||(Standley) S. L. Welsh +|
|Basionyms||Atriplex rydbergii +|
|Common name||Rydberg’s orach +|
|Distribution||Ariz. +, Colo. +, N.Mex. + and Utah. +|
|Elevation||1200-2100 m +|
|Habitat||Saline, fine-textured substrates derived mainly from Mancos Shale and Morrison formations and clay or silty alluvium, growing in salt desert shrub and floodplain communities +|
|Illustrator||Bee F. Gunn +|
|Phenology||Flowering summer–fall. +|
|Publication title||Rhodora +|
|Publication year||2001 +|
|Source xml||https://firstname.lastname@example.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse grained fna xml/V4/V4 676.xml +|
|Synonyms||Atriplex pachypoda +|
|Taxon family||Chenopodiaceae +|
|Taxon name||Atriplex argentea var. rydbergii +|
|Taxon parent||Atriplex argentea +|
|Taxon rank||variety +|
|Volume||Volume 4 +|