Flora of North America species comparison

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Zuckia

siltbush, zuckia
Habit Shrubs or subshrubs, dioecious or monoecious; herbage ± scurfy.
Stems

erect or ascending, branching from base, not jointed, not armed;

axillary buds prominent, subglobose.
Leaves

alternate, subsessile or bases tapering to short petioles;

blade linear or narrowly oblanceolate-spatulate to elliptic, ovate, obovate, or orbiculate, margins entire or rarely hastately lobed, apex acute or obtuse.
Inflorescences

commonly with some moniliform hairs;

staminate flowers borne in spikes in apical axils or ± paniculate, glomerules 2–5-flowered;

pistillate flowers 1–several per bract, often some vestigial.
Staminate flowers

not separately bracteolate, but with linear bracts subtending each spike;

perianth 4(–5)-lobed;

stamens 4–5.
Pistillate flowers

each enclosed by 2 bracteoles connate nearly to apex;

perianth absent;

stigmas 2.
Seeds

reniform;

seed coat greenish, tuberculate;

embryo annular;

perisperm copious.
Fruiting

structures: bracteoles either veinless and laterally flattened and/or 1–3-veined adaxially, or rarely unequally 3-winged, enclosed achene vertical, or bracteoles transversely flattened, oval to hexagonal and not or unequally 1–4(–5)-ridged, with 2 slightly enlarged wings, thus accommodating horizontal achene, margins not spongy-thickened;

bracteoles lacking spongy cellular matrix, often subtended by single, filiform bractlet;

pericarp adherent.
x

= 9.

Zuckia
Distribution
from USDA
w United States
Discussion

Species 1.

Zuckia was erected by P. C. Standley (1916) to include a solitary species, Z. arizonica, based on low, shrubby plants from saline, fine-textured substrates in northern Arizona. That taxon stood apart from Grayia brandegeei A. Gray, a species otherwise closely similar in the compression of the bracts and the horizontal position of the seeds. In the present treatment both taxa are included within an expanded Zuckia.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 4, p. 303. Author: Stanley L. Welsh.
Parent taxa Chenopodiaceae
Subordinate taxa
Z. brandegeei
Name authority Standley: J. Wash. Acad. Sci. 5: 58. (1916)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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